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In this paper the effect of parameters such as current density, temperature, electrolytic bath pH and concentration of chromium sulfate and sodium hypophosphite on the electrodeposition process of the Cr-P alloys was investigated.... more
In this paper the effect of parameters such as current density, temperature, electrolytic bath pH and concentration of chromium sulfate and sodium hypophosphite on the electrodeposition process of the Cr-P alloys was investigated. Chemical composition of the coatings was evaluated by scanning electron microscopy and X-ray diffraction. Experimental design 25-1 central composite design was used to evaluate the chemical composition of alloys, current efficiency and the appearance of coatings as well as to optimize the electrodeposition process of the alloy using Response Surface Methodology associated with experimental design. The Harrington desirability function was applied for optimization. The optimal composition of bath (in g/l) and electrolysis conditions are proposed: Cr2(SO4)3·6H2O – 285, Al2(SO4)3·12H2O – 120, Na2SO4 – 50, NaH2PO2·H2O – 20, CO(NH2)2 – 70, рН – 1.3, temperature – 35 ºС, current density – 46 А/dm2. An acceptable current efficiency 13-14 % was observed for an allo...
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Statistical processing of data on the total concentration (⅀ci) of bath components proposed and used for electrodeposition of coatings since 2011 has been carried out. The median value of the total concentration of the components of the... more
Statistical processing of data on the total concentration (⅀ci) of bath components proposed and used for electrodeposition of coatings since 2011 has been carried out. The median value of the total concentration of the components of the baths divides them into two groups: baths with low resource consumption (⅀ci ≤ 2,88 mol eq./l); baths with high resource consumption (⅀ci >2,88 mol eq./l). In the group of baths of low chemical content using quartiles are allocated: Q1 is a subgroup of baths in which the total concentration of components is not more than 2,36 mol eq./l; Q2 - a subgroup of baths in which the total concentration of components is more than 2.36, but not more than 2,88 mol eq./l; in the group of bats with high resource consumption, Q3 is a subgroup of baths in which the total concentration of components is more than 2,88, but not more than 3,48 mol eq./l; Q4 - a subgroup of baths in which the total concentration of components is more than 3,48 mol eq./l. Classification of baths using quartiles allows the most objective assessment of the environmental performance of the technology in terms of the achieved level of concentrations of components in process solutions.
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Abstract A physicochemical model of the choice of a ligand for the electroless deposition of metal–phosphorus alloys is proposed based on determining the conditions for electrochemical reactions that cause the formation of the alloy and... more
Abstract A physicochemical model of the choice of a ligand for the electroless deposition of metal–phosphorus alloys is proposed based on determining the conditions for electrochemical reactions that cause the formation of the alloy and minimizing possible side reactions that impede the quality of the deposition process. Based on the physicochemical model, the optimal range of values of the stability constants and pH was determined for electroless nickel plating. It is shown that, for the pH range 7–9, which corresponds to the maximum deposition rates, stability constants take values from 5 to 10; carrying out the process in more alkaline solutions requires the use of more stable complexes. The predictive ability of the model is confirmed by experimental studies of the process of electroless nickel plating from solutions of various ligand compositions.
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Galvanic coatings have been attracting attention for many years as an object of research from both theoretical and practical points of view. A relatively new direction in electroplating is the production of composite coatings, which are... more
Galvanic coatings have been attracting attention for many years as an object of research from both theoretical and practical points of view. A relatively new direction in electroplating is the production of composite coatings, which are based on metal matrices and dispersed phases of different nature. Introduction to the electrolyte for joint electrochemical deposition of micro -, nanoparticles of oxides, carbides, nitrides, polymers, etc. allows you to adjust the structure, composition, properties of coatings, providing them with new characteristics. As shown by the analysis of publications on this topic in the VINITI RAS Database, systematic research in this area has been carried out for about twenty years and interest in them has not decreased. The system of queries from the array of published documents selected and summarized all currently known combinations of metal matrix/dispersed phase and information about their properties (corrosion behavior, wear resistance, microhardness...
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The possibility of preparing and properties (surface morphology, microhardness, corrosion resistance) of nickel–zirconia composite coatings electrodeposited from nickel acetate solutions containing a dispersed phase in the form of a... more
The possibility of preparing and properties (surface morphology, microhardness, corrosion resistance) of nickel–zirconia composite coatings electrodeposited from nickel acetate solutions containing a dispersed phase in the form of a conventional polydisperse crystalline micropowder and a sol with nanoscale particles have been discussed. The effect of the particle size and concentration and the electrolysis conditions on the properties of the coatings has been determined.
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Experimental data on internal stress in chromium coatings electrodeposited from Cr(III)-solutions have been obtained. Tensile stress 250-300 MPa is observed in thin coatings with thickness was below 1-3 μm. The internal stress is... more
Experimental data on internal stress in chromium coatings electrodeposited from Cr(III)-solutions have been obtained. Tensile stress 250-300 MPa is observed in thin coatings with thickness was below 1-3 μm. The internal stress is practically independent on current density and pH of the solution. A reduction in the plate thickness corresponding to σ=0 is observed, when pH has changed from 1.2 to 1.6 and current density from 30 to 35 A/dm2 at higher values of pH and current density compressive stress is observed and increases the difference in the stress values at greater thicknesses of the coatings: ((– 10) - (– 50) MPa). These results have been compared with similar data for the coatings deposited from Cr(VI) solutions including the effects of the non-metal inclusions in the coatings (for Cr(III)-bath H – 10.5 - 13 at. % (26 - 32 ml H2 / g Cr), O – 0.06-0.6 at. %, С – 0.04-7.8 at. %; for Cr(VI)-bath H – 1.8 at. %, O – 1.2 at. %, С – 0 at. %)). Compressive stress, related with the in...
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The influence of characteristics of ligands and nickel complex compounds on the rate of the autocatalytic (chemical) deposition of nickel–phosphorus coating and the phosphorus content is considered. It has been established that the charge... more
The influence of characteristics of ligands and nickel complex compounds on the rate of the autocatalytic (chemical) deposition of nickel–phosphorus coating and the phosphorus content is considered. It has been established that the charge and complex of the ligand have the highest effect on the rate of process, and charge number and stability of the complex ion have the highest effect on the content of phosphorus in the coating. Mathematical models describing the relationship between the deposition rate, the composition of coatings, and the corresponding ligand parameters are obtained. Recommendations for the selection of the ligand composition of solutions for the chemical deposition of nickel–phosphorus alloy are proposed.
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New antifriction composition coatings based on Ni–P alloy and nanodisperse particles of copper phthalocyanate (CuPc) modified with 4-benzenediazonium carboxylate have been prepared and investigated. The effect of the content of carboxylic... more
New antifriction composition coatings based on Ni–P alloy and nanodisperse particles of copper phthalocyanate (CuPc) modified with 4-benzenediazonium carboxylate have been prepared and investigated. The effect of the content of carboxylic groups in the disperse phase on the wear resistance of the coatings has been studied, and the optimal concentration of CuPc in the suspension for the autocatalytic deposition of composition coatings has been determined.
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The scientifically based selection of efficient chemical technologies is related to the integrated assessment of indicators of their energy and resource efficiency and environmental safety, as well as indicators of the quality of... more
The scientifically based selection of efficient chemical technologies is related to the integrated assessment of indicators of their energy and resource efficiency and environmental safety, as well as indicators of the quality of products. The authors conducted systematic analysis of the efficiency and competitiveness of two electrochemical technologies of chroming from the solutions based on chromium salts of different valences. The strengths and weaknesses of each technology have been defined using the methodology of SWOT analysis, and the defined qualitative indicators of the efficiency of technologies have been determined using the methods of nonparametric statistics.
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The possibility of using metal-plated carbon and basalt fabrics for shielding electromagnetic radiation in a wide frequency range was demonstrated. The electrophysical characteristics of carbon, metal-plated carbon, and metal-plated... more
The possibility of using metal-plated carbon and basalt fabrics for shielding electromagnetic radiation in a wide frequency range was demonstrated. The electrophysical characteristics of carbon, metal-plated carbon, and metal-plated basalt fabrics were compared. The optimum conditions of metal plating of complex textile structures, ensuring high electrophysical properties of the resulting combined materials, were determined, including the optimum conditions for pretreatment of nonconducting fibers and fabrics prior to metal plating and compositions of low-temperature electrolytes for electroless copper and nickel plating, with which uniform distribution of the metals can be obtained on each element of the textile structure.
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We have studied the physicomechanical properties (adhesion to steel, microhardness, and wear resistance) of chemical nickel-phosphorus coatings doped with a small amount (0.5–2%) of copper. The as-grown coatings have low porosity and... more
We have studied the physicomechanical properties (adhesion to steel, microhardness, and wear resistance) of chemical nickel-phosphorus coatings doped with a small amount (0.5–2%) of copper. The as-grown coatings have low porosity and stable composition. They are identical in mechanical properties to conventional chemical nickel-phosphorus coatings but exhibit enhanced wear resistance after heat treatment at a temperature of 600°C. Copper doping improves the corrosion resistance of the coatings in acidified chloride solutions.
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ABSTRACT Electrodeposition from solutions based on Cr(III) compounds of composite chromium coatings with denotation nanodiamond (DND) particles and composite coatings (CCs) of silicon dioxide–DND obtained using the sol–gel method is... more
ABSTRACT Electrodeposition from solutions based on Cr(III) compounds of composite chromium coatings with denotation nanodiamond (DND) particles and composite coatings (CCs) of silicon dioxide–DND obtained using the sol–gel method is studied. Physicomechanical properties and composition of these com� posite coatings (CCs) are investigated. It is found that the presence of DND particles produces a significant effect on chromium coatings and causes a 1.4�fold increase in their microhardness. Herewith, brittleness of coatings decreases. DND content in CCs reaches final values (12–14 vol % or 6.4–7.2 wt %) at an increase in the DND concentration in the solution to 30 g/L. The performed studies allow establishing the optimum DND concentration in chromium–plating solutions (17 g/L) and in CCs (10.5 vol % or 5.6 wt %) that pro� vides the maximum microhardness and minimum brittleness of chromium–DND coatings. Application of thin films from SiO2 sols modified by DND particles is studied. Dependences of microhardness and optical transmission of samples with coatings on the sol composition are established. The optical concentration of DND corresponding to the maximum coating microhardness is 0.5 wt %. An increase in DND content in the solution above 0.5 wt % causes a drastic decrease in the microhardness and optical transmission of samples with coatings and an increase in microbrittleness.
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ABSTRACT
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ABSTRACT Kinetics of electroreduction of Cr3+ions in an electrolyte based on Cr3+sulfate, which permits to produce thick (up to 100 µm) hard metal layers, is studied. The chemical stage of rearrangement of Cr2+complexes in the... more
ABSTRACT Kinetics of electroreduction of Cr3+ions in an electrolyte based on Cr3+sulfate, which permits to produce thick (up to 100 µm) hard metal layers, is studied. The chemical stage of rearrangement of Cr2+complexes in the near-electrode layer is the reaction's slow stage. The experimental Tafel slope btaf= 72 mV, which is close to theoretical value of 60 mV, and the reaction orders $$P_{{\text{H}}^{\text{ + }} } $$ = –1 and $$P_{{\text{Cr}}^{{\text{3 + }}} } $$ = 1 are explained.
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ABSTRACT A comparative analysis is performed of the variations in the total concentration of the main components , in the solutions proposed and used in different years for electroplating individual metals (Cr, Cu, Ni, Zn, Sn, Cd, Pb, and... more
ABSTRACT A comparative analysis is performed of the variations in the total concentration of the main components , in the solutions proposed and used in different years for electroplating individual metals (Cr, Cu, Ni, Zn, Sn, Cd, Pb, and Fe). A quantitative concentration criterion is determined for classifying solutions into resource-saving ( mol-equiv/L) and resourceintensive ( mol-equiv/L) compositions. In addition to scientific interest, this material can be useful for developing studies aimed at reducing the negative environmental impact of electroplating shops or sections.
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ABSTRACT A comparative analysis is performed of the variations in one of the resource-saving indicators, namely, the concentration of metal ions (Cr, Cu, Ni, Zn, Sn, Cd, Pb, and Fe) in the compositions of solutions proposed and used in... more
ABSTRACT A comparative analysis is performed of the variations in one of the resource-saving indicators, namely, the concentration of metal ions (Cr, Cu, Ni, Zn, Sn, Cd, Pb, and Fe) in the compositions of solutions proposed and used in different years for electroplating. A quantitative concentration criterion is deter-mined for classifying the compositions of solutions used for metal electroplating into resource-saving (c ≤ 0.71 mol/L) and resource-intensive (c ≥ 0.96 mol/L) compositions. In addition to scientific interest, this material can be useful for developing studies aimed at reducing the negative environmental impact of electroplating shops or sections.
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ABSTRACT Based on a statistical analysis of the information on the composition of solutions for the electrodeposition of A-B alloys, a mathematical model is proposed that makes it possible to choose the preferable range of the total... more
ABSTRACT Based on a statistical analysis of the information on the composition of solutions for the electrodeposition of A-B alloys, a mathematical model is proposed that makes it possible to choose the preferable range of the total concentrations of ligands in solutions for alloy electrodeposition. The prediction by the model is verified by known and new experimental data.
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The microhardness and structure of composite chromium coatings modified by dispersed CeO2 and ultradispersed diamond (UDD), as well as the granulometric UDD distribution (both in the coatings and the bath) were investigated. The presence... more
The microhardness and structure of composite chromium coatings modified by dispersed CeO2 and ultradispersed diamond (UDD), as well as the granulometric UDD distribution (both in the coatings and the bath) were investigated. The presence of the particles in the coatings reduced the number of microcracks and enhanced the microhardness. Passing from the chromium to the composite coatings makes the microhardness measured on the microsections and the specimen surface converge. Despite the uniform distribution of the particles in the coatings, nonuniform distribution of their sizes is satisfactorily described by a lognormal distribution function. A selective deposition of nano-size particles (with the most probable radius of UDD particles of 204 nm) was found out, although dynamic aggregates found in the solution have the most probable radius of 4530 nm. This is possibly associated with their disaggregation near the electrode and the inclusion of the finer particles into the coating.
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Citations are currently one of the most important indicators of scientific performance. In this work, we set out to analyse the dynamics of publication activity and the citations of Russian researchers in foreign journals in comparison... more
Citations are currently one of the most important indicators of scientific performance. In this work, we set out to analyse the dynamics of publication activity and the citations of Russian researchers in foreign journals in comparison with similar indicators for foreign researchers published in Russian journals. Using the methods of nonparametric statistics, we studied citation indicators for 5 journals from different research areas published in 4 foreign countries (Germany, the Netherlands, Great Britain and the USA) and Russia. An additional research instrument was the content analysis of scientific article reviews. A statistically significant decrease in the citation of Russian authors by both foreign (from 1,4 to 0,4%), and Russian scientists (from 21,8 to 11,2%) in foreign journals in the period under review was observed. If this trend persists over the following five years, the citation
of authors affiliated with the Russian Federation will decrease to a minimal level, which may negatively affect the international ratings of Russian scientific organizations. Recommendations on curbing
the identified negative dynamics include the need to improve the quality of scientific research and publications, as well as to stimulate reasonable citation of the works by Russian authors in translated editions included in international databases.
Одним из важнейших современных показателей результативности научной деятельности является уровень цитирования.
Цель предлагаемой работы заключалась в анализе динамики публикационной активности и цитируемости российских ученых в зарубежных журналах в сравнении с аналогичными показателями для зарубежных ученых, публикующихся в российских журналах. Методами непараметрической статистики были изучены показатели цитирования в пяти журналах из различных областей науки и направлений исследования, издаваемых в четырех зарубежных странах (Германия, Нидерланды, Великобритания и США) и Российской Федерации. Дополнительным исследовательским инструментом стал анализ рецензий. Согласно полученным результатам, наблюдается статистически значимое уменьшение доли цитирований российских авторов как зарубежными (с 1,4 до 0,4%), так и российскими учеными (с 21,8 до 11,2%) в зарубежных журналах в рассматриваемый период. При сохранении такой тенденции в ближайшие пять лет цитирование авторов, аффилированных с Российской Федерацией, будет носить единичный характер, что негативно отразится на международных рейтингах (особенно SIR) научных организаций. Рекомендации для компенсации отрицательной динамики включают необходимость повышения качества научных исследований и публикаций, а также стимулирование обоснованного цитирования работ российских авторов в переводных изданиях, входящих в международные базы данных.
of authors affiliated with the Russian Federation will decrease to a minimal level, which may negatively affect the international ratings of Russian scientific organizations. Recommendations on curbing
the identified negative dynamics include the need to improve the quality of scientific research and publications, as well as to stimulate reasonable citation of the works by Russian authors in translated editions included in international databases.
Одним из важнейших современных показателей результативности научной деятельности является уровень цитирования.
Цель предлагаемой работы заключалась в анализе динамики публикационной активности и цитируемости российских ученых в зарубежных журналах в сравнении с аналогичными показателями для зарубежных ученых, публикующихся в российских журналах. Методами непараметрической статистики были изучены показатели цитирования в пяти журналах из различных областей науки и направлений исследования, издаваемых в четырех зарубежных странах (Германия, Нидерланды, Великобритания и США) и Российской Федерации. Дополнительным исследовательским инструментом стал анализ рецензий. Согласно полученным результатам, наблюдается статистически значимое уменьшение доли цитирований российских авторов как зарубежными (с 1,4 до 0,4%), так и российскими учеными (с 21,8 до 11,2%) в зарубежных журналах в рассматриваемый период. При сохранении такой тенденции в ближайшие пять лет цитирование авторов, аффилированных с Российской Федерацией, будет носить единичный характер, что негативно отразится на международных рейтингах (особенно SIR) научных организаций. Рекомендации для компенсации отрицательной динамики включают необходимость повышения качества научных исследований и публикаций, а также стимулирование обоснованного цитирования работ российских авторов в переводных изданиях, входящих в международные базы данных.
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In this paper the effect of parameters such as current density, temperature, electrolytic bath pH and concentration of chromium sulfate and sodium hypophosphite on the electrodeposition pro-cess of the Cr-P alloys was investigated.... more
In this paper the effect of parameters such as current density, temperature, electrolytic bath pH and concentration of chromium sulfate and sodium hypophosphite on the electrodeposition pro-cess of the Cr-P alloys was investigated. Chemical composition of the coatings was evaluated by scanning electron microscopy and X-ray diffraction. Experimental design 25-1 central composite de-sign was used to evaluate the chemical composition of alloys, current efficiency and the appearance of coatings as well as to optimize the electrodeposition process of the alloy using Response Surface Methodology associated with experimental design. The Harrington desirability function was applied for optimization. The optimal composition of bath (in g/l) and electrolysis conditions are proposed: Cr2(SO4)3·6H2O – 285, Al2(SO4)3·12H2O – 120, Na2SO4 – 50, NaH2PO2·H2O – 20, CO(NH2)2 – 70, рН – 1.3, temperature – 35 ºС, current density – 46 А/dm2. An acceptable current efficiency 13-14 % was observed for an alloy obtained under optimal conditions of 46 A/dm2, 35 °C and pH 1.3 from an electrolyte of optimal composition. Under these conditions, the coating contained 16 wt.% phosphorus. The alloys were X-ray amorphous at a phosphorus content of about 6 wt.%. When the phosphorus content was 16 wt.% the alloys became nanocrystalline and the chromium phosphide – Cr3P phase was re-leased, which can be seen from the peaks on X-ray diffractograms. This indicates the formation of Cr-Cr3P nanocrystalline composite coatings under nucleation conditions (in Statu Nascendi). There-fore, the results of this work show the importance of using optimization techniques to obtain metallic coatings with controlled properties for different types of applications.
Key words: amorphous, nanocrystalline, experiment design, composite coatings, alloy
Key words: amorphous, nanocrystalline, experiment design, composite coatings, alloy
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Focus on the best available practices. Increase the list of references to 50-60 documents. Cite articles by Russian authors. Cite your articles (within reasonable limits). Write a correct bibliographic description (name of all... more
Focus on the best available practices.
Increase the list of references to 50-60 documents.
Cite articles by Russian authors.
Cite your articles (within reasonable limits).
Write a correct bibliographic description (name of all authors, title of the article, year, volume, number, pages + doi).
Editors should check the completeness and correctness of the indexing of the issue, including the references in the articles.
Increase the list of references to 50-60 documents.
Cite articles by Russian authors.
Cite your articles (within reasonable limits).
Write a correct bibliographic description (name of all authors, title of the article, year, volume, number, pages + doi).
Editors should check the completeness and correctness of the indexing of the issue, including the references in the articles.
Kinetics of electroreduction of Cr3+ ions in an electrolyte based on Cr3+ sulfate, which permits to produce thick (up to 100mm) hard metal layers, is studied. The chemical stage of rearrangement of Cr2+ complexes in the near-electrode... more
Kinetics of electroreduction of Cr3+ ions in an electrolyte based on Cr3+ sulfate, which permits to produce thick (up to 100mm) hard metal layers, is studied. The chemical stage of rearrangement of Cr2+ complexes in the near-electrode layer is the reaction’s slow stage. The experimental Tafel slope b= 72 mV, which is close to theoretical value of 60 mV, and the reaction orders p(H+) = –1 and p(Cr3+)= 1 are explained.
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The effect of stirring on the kinetics of electrode processes in a chromium-plating electrolyte based on chromium(Ill) sulfate is studied. The electrolyte, in which thick (up to 120 I.tm) hard chromium coatings can be obtained, is stirred... more
The effect of stirring on the kinetics of electrode processes in a chromium-plating electrolyte based on chromium(Ill) sulfate is studied. The electrolyte, in which thick (up to 120 I.tm) hard chromium coatings can be obtained, is stirred with a magnetic stirrer. Hydrodynamic conditions in the system are calibrated in a mod-eling solution containing the same components as the electrolyte (with the exception of chromium sulfate which is replaced by an equivalent amount of aluminum sulfate), by the reaction of discharge of hydronium ions. It is shown that reactions of discharge of hydronium ions and incomplete reduction of trivalent chromium ions occur in a diffusion mode. The Cr(III)-Cr(II) system is classified with quasi-reversible redox electrodes and is described by the known equation for diffusion kinetics. The electrodeposition of metallic chromium occurs in the mixed kinetics mode.
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Science, Environments, Processes Equipment, PC boards Mechanism of problem-oriented search for information on electroplating, surface treatment and corrosion protection Investigation of the effect of nitrogen-containing inhibitor on... more
Science, Environments, Processes Equipment, PC boards
Mechanism of problem-oriented search for information on electroplating, surface treatment and corrosion protection
Investigation of the effect of nitrogen-containing inhibitor on corrosion of pipelines of heating networks
Study of the electrochemical behavior of silver in sodium chloride solution
Toxicity comparison of the galvanic aerosols obtained during two electrochemical processes in marine microalgae bioassay
Investigation of electroflotation extraction processes of a mixture of insoluble copper and nickel compounds in the presence of organic composition used in the treatment of metal surfaces
Reducing the environmental load of wastewater from the electroplating shop
Ion-exchange recovery of nickel(II) from rinsing water after electroless metallization in ammonia-citrate alkaline solutions
Mechanism of problem-oriented search for information on electroplating, surface treatment and corrosion protection
Investigation of the effect of nitrogen-containing inhibitor on corrosion of pipelines of heating networks
Study of the electrochemical behavior of silver in sodium chloride solution
Toxicity comparison of the galvanic aerosols obtained during two electrochemical processes in marine microalgae bioassay
Investigation of electroflotation extraction processes of a mixture of insoluble copper and nickel compounds in the presence of organic composition used in the treatment of metal surfaces
Reducing the environmental load of wastewater from the electroplating shop
Ion-exchange recovery of nickel(II) from rinsing water after electroless metallization in ammonia-citrate alkaline solutions
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A physicochemical model of the choice of a ligand for the electroless deposition of metal-phosphorus alloys is proposed based on determining the conditions for electrochemical reactions that cause the formation of the alloy and minimizing... more
A physicochemical model of the choice of a ligand for the electroless deposition of metal-phosphorus alloys is proposed based on determining the conditions for electrochemical reactions that cause the formation of the alloy and minimizing possible side reactions that impede the quality of the deposition process. Based on the physicochemical model, the optimal range of values of the stability constants and pH was determined for electroless nickel plating. It is shown that, for the pH range 7-9, which corresponds to the maximum deposition rates, stability constants take values from 5 to 10; carrying out the process in more alkaline solutions requires the use of more stable complexes. The predictive ability of the model is confirmed by experimental studies of the process of electroless nickel plating from solutions of various ligand compositions.
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Выполнен анализ масштабов, внутренней структуры гальванического производства в России и определены факторы технологического отставания, проявляющегося, в том числе, в относительно более низкой ресурсной и экологической эффективности... more
Выполнен анализ масштабов, внутренней структуры гальванического производства в России и определены факторы технологического отставания, проявляющегося, в том числе, в относительно более низкой ресурсной и экологической эффективности производственных процессов. В России ежегодно наносится 25—44 тыс. тонн металлических гальванических
покрытий (а общемировая оценка колеблется в диапазоне от 740 до 1700 тыс. т/год). Совокупная площадь обрабатываемой
покрытиями поверхности за год: 200—370 млн м2.Сформулированы научно-технологические принципы повышения эффективности с учетом экологических рисков.
покрытий (а общемировая оценка колеблется в диапазоне от 740 до 1700 тыс. т/год). Совокупная площадь обрабатываемой
покрытиями поверхности за год: 200—370 млн м2.Сформулированы научно-технологические принципы повышения эффективности с учетом экологических рисков.
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Science Environments Processes Equipment PC boards Training
Research Interests: Electrochemistry, Corrosion Science, Wastewater Treatment, Electrodeposition, Corrosion Engineering, and 7 moreThin Films by Electrochemical Deposition and NanoTechnology, Surface finishing, Electroless Metallic Coatings, Surface treatment, Electroplating, Metal finishing, and Chrome Electroplating Wastewater
Galvanic coatings have been attracting attention for many years as an object of research from both theoretical and practical points of view. A relatively new direction in electroplating is the production of composite coatings, which are... more
Galvanic coatings have been attracting attention for many years as an object of research from both theoretical and practical points of view. A relatively new direction in electroplating is the production of composite coatings, which are based on metal matrices and dispersed phases of different nature. Introduction to the electrolyte for joint electrochemical deposition of micro -, nanoparticles of oxides, carbides, nitrides, polymers, etc. allows you to adjust the structure, com-position, properties of coatings, providing them with new characteristics. As shown by the analy-sis of publications on this topic in the VINITI RAS Database, systematic research in this area has been carried out for about twenty years and interest in them has not decreased. The system of queries from the array of published documents selected and summarized all currently known combinations of metal matrix/dispersed phase and information about their properties (corrosion behavior, wear resistance, microhardness, resistance to high-temperature oxidation, heat re-sistance, structural and adhesive characteristics). The results are presented in the form of tables and are provided with links to the original works. The analysis of the obtained problem-oriented database showed that for the period 2000-2019, no more than 15-20% of possible combinations were described, and an even smaller number of composite coatings were studied in depth and brought to practical use. The presented material makes it possible to analyze promising areas of research in a clear and easy to find source information form. The review is based on more than 400 references to journal articles. The original database on composite electroplating contains 1650 sources (patents, reports, brief reports, deposited manuscripts, etc.) that may be of interest as an extensive reference material.
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Science Environments Processes Equipment PC boards Training
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Science Environments Processes Equipment PC boards Training = Наука Экология Технология Оборудование Печатные платы Образование
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Science Environments Processes Equipment PC boards Training
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Two copies should be submitted, in doublespaced typing on pages of uniform size with wide margins. Some flexibility of presentation will be allowed but authors are urged to arrange the subject matter clearly under such headings as:... more
Two copies should be submitted, in doublespaced typing on pages of uniform size with wide margins. Some flexibility of presentation will be allowed but authors are urged to arrange the subject matter clearly under such headings as:
Introduction, Experimental details, Results, Duscussion, etc. An abstract at ~300 words should accompany papers.
References should be numbered consecutively (in square brackets) throughout the text and collected together in a reference list at the end of the paper. Journal titles should be abbreviated according to the Chemical Abstracts Service Source Index, 1970 edition, and supplements. The abbreviated title should be followed by volume number, year (in parentheses) and page number.
Two sets of figures should be submitted. One set of line drawings should be in a form suitable for reproduction, drawn in black ink on drawing paper (letter height, 35 mm). Photographs should be submitted as clear blackandwhite prints on glossy paper. Each illustration must be clearly numbered. Legends to the illustrations must be submitted in a separate list. All tables and illustrations should be numbered consecutively and separately throughout the paper.
Introduction, Experimental details, Results, Duscussion, etc. An abstract at ~300 words should accompany papers.
References should be numbered consecutively (in square brackets) throughout the text and collected together in a reference list at the end of the paper. Journal titles should be abbreviated according to the Chemical Abstracts Service Source Index, 1970 edition, and supplements. The abbreviated title should be followed by volume number, year (in parentheses) and page number.
Two sets of figures should be submitted. One set of line drawings should be in a form suitable for reproduction, drawn in black ink on drawing paper (letter height, 35 mm). Photographs should be submitted as clear blackandwhite prints on glossy paper. Each illustration must be clearly numbered. Legends to the illustrations must be submitted in a separate list. All tables and illustrations should be numbered consecutively and separately throughout the paper.
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Statistical processing of data on the total concentration (⅀ci) of bath components proposed and used for electrodeposition of coatings since 2011 has been carried out. The median value of the total concentration of the components of the... more
Statistical processing of data on the total concentration (⅀ci) of bath components proposed and used for electrodeposition of coatings since 2011 has been carried out. The median value of the total concentration of the components of the baths divides them into two groups: baths with low resource consumption (⅀ci ≤ 2,88 mol eq./l); baths with high resource consumption (⅀ci >2,88 mol eq./l).
In the group of baths of low chemical content using quartiles are allocated: Q1 is a subgroup of baths in which the total concentration of components is not more than 2,36 mol eq./l; Q2 - a subgroup of baths in which the total concentration of components is more than 2.36, but not more than 2,88 mol eq./l; in the group of bats with high resource consumption, Q3 is a subgroup of baths in which the total concentration of components is more than 2,88, but not more than 3,48 mol eq./l; Q4 - a subgroup of baths in which the total concentration of components is more than 3,48 mol eq./l. Classification of baths using quartiles allows the most objective assessment of the environmental performance of the technology in terms of the achieved level of concentrations of components in process solutions.
In the group of baths of low chemical content using quartiles are allocated: Q1 is a subgroup of baths in which the total concentration of components is not more than 2,36 mol eq./l; Q2 - a subgroup of baths in which the total concentration of components is more than 2.36, but not more than 2,88 mol eq./l; in the group of bats with high resource consumption, Q3 is a subgroup of baths in which the total concentration of components is more than 2,88, but not more than 3,48 mol eq./l; Q4 - a subgroup of baths in which the total concentration of components is more than 3,48 mol eq./l. Classification of baths using quartiles allows the most objective assessment of the environmental performance of the technology in terms of the achieved level of concentrations of components in process solutions.
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In this work, we created a thermodynamic probability model of ligand selection in solutions for the electrodeposition of alloys. A forecast was made for complex compounds for the electrodeposition of Cu–Co and Sn–Zn alloys and potential... more
In this work, we created a thermodynamic probability model of ligand selection in solutions for the electrodeposition of alloys. A forecast was made for complex compounds for the electrodeposition of Cu–Co and Sn–Zn alloys and potential electrochemical synthesis of Cu–Co alloy from the solutions based on ammonia and glutamate complexes and Sn–Zn alloy from solutions containing fluoride complexes was experimentally confirmed.
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⎯New antifriction composition coatings based on NiP alloy and nanodisperse particles of copper phthalocyanate (CuPc) modified with 4-benzenediazonium carboxylate have been prepared and investigated. The effect of the content of carboxylic... more
⎯New antifriction composition coatings based on NiP alloy and nanodisperse particles of copper phthalocyanate (CuPc) modified with 4-benzenediazonium carboxylate have been prepared and investigated. The effect of the content of carboxylic groups in the disperse phase on the wear resistance of the coatings has been studied, and the optimal concentration of CuPc in the suspension for the autocatalytic deposi-tion of composition coatings has been determined.
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The influence of characteristics of ligands and nickel complex compounds on the rate of the auto-catalytic (chemical) deposition of nickel-phosphorus coating and the phosphorus content is considered. It has been established that the... more
The influence of characteristics of ligands and nickel complex compounds on the rate of the auto-catalytic (chemical) deposition of nickel-phosphorus coating and the phosphorus content is considered. It has been established that the charge and complex of the ligand have the highest effect on the rate of process, and charge number and stability of the complex ion have the highest effect on the content of phosphorus in the coating. Mathematical models describing the relationship between the deposition rate, the composition of coatings, and the corresponding ligand parameters are obtained. Recommendations for the selection of the ligand composition of solutions for the chemical deposition of nickel-phosphorus alloy are proposed.
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Experimental data on internal stress in chromium coatings electrodeposited from Cr(III)-solutions have been obtained. Tensile stress 250-300 MPa is observed in thin coatings with thick-ness was below 1-3 μm. The internal stress is... more
Experimental data on internal stress in chromium coatings electrodeposited from Cr(III)-solutions have been obtained. Tensile stress 250-300 MPa is observed in thin coatings with thick-ness was below 1-3 μm. The internal stress is practically independent on current density and pH of the solution. A reduction in the plate thickness corresponding to σ=0 is observed, when pH has changed from 1.2 to 1.6 and current density from 30 to 35 A/dm2 at higher values of pH and current density compressive stress is observed and increases the difference in the stress values at greater thicknesses of the coatings: ((– 10) - (– 50) MPa). These results have been compared with similar data for the coatings deposited from Cr(VI) solutions including the effects of the non-metal inclu-sions in the coatings (for Cr(III)-bath H – 10.5 - 13 at. % (26 - 32 ml H2 / g Cr), O – 0.06-0.6 at. %, С – 0.04-7.8 at. %; for Cr(VI)-bath H – 1.8 at. %, O – 1.2 at. %, С – 0 at. %)). Compressive stress, related with the inclusions (including carbides) is the major cause, limiting the possibility to im-prove the characteristics of chromium coatings and to deposit coatings of the quality comparable to that of chrome plated from Cr(VI) baths.
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The scientifically based selection of efficient chemical technologies is related to the integrated assessment of indicators of their energy and resource efficiency and environmental safety, as well as indicators of the quality of... more
The scientifically based selection of efficient chemical technologies is related to the integrated assessment of indicators of their energy and resource efficiency and environmental safety, as well as indicators of the quality of products. The authors conducted systematic analysis of the efficiency and competitiveness of two electrochemical technologies of chroming from the solutions based on chromium salts of different valences. The strengths and weaknesses of each technology have been defined using the methodology of SWOT analysis, and the defined qualitative indicators of the efficiency of technologies have been determined using the methods of nonparametric statistics.
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—The possibility of preparing and properties (surface morphology, microhardness, corrosion resistance) of nickel–zirconia composite coatings electrodeposited from nickel acetate solutions containing a dispersed phase in the form of a... more
—The possibility of preparing and properties (surface morphology, microhardness, corrosion resistance) of nickel–zirconia composite coatings electrodeposited from nickel acetate solutions containing a dispersed phase in the form of a conventional polydisperse crystalline micropowder and a sol with nanoscale particles have been discussed. The effect of the particle size and concentration and the electrolysis conditions on the properties of the coatings has been determined.
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Research Interests:
The possibility of using metal-plated carbon and basalt fabrics for shielding electromagnetic radiation in a wide frequency range was demonstrated. The electrophysical characteristics of carbon, metal-plated carbon, and metal-plated... more
The possibility of using metal-plated carbon and basalt fabrics for shielding electromagnetic radiation in a wide frequency range was demonstrated. The electrophysical characteristics of carbon, metal-plated carbon, and metal-plated basalt fabrics were compared. The optimum conditions of metal plating of complex
textile structures, ensuring high electrophysical properties of the resulting combined materials, were determined, including the optimum conditions for pretreatment of nonconducting fi bers and fabrics prior to metal plating and compositions of low-temperature electrolytes for electroless copper and nickel plating, with which uniform
distribution of the metals can be obtained on each element of the textile structure.
textile structures, ensuring high electrophysical properties of the resulting combined materials, were determined, including the optimum conditions for pretreatment of nonconducting fi bers and fabrics prior to metal plating and compositions of low-temperature electrolytes for electroless copper and nickel plating, with which uniform
distribution of the metals can be obtained on each element of the textile structure.
Research Interests:
We have studied the physicomechanical properties (adhesion to steel, microhardness, and wear resistance) of chemical nickel–phosphorus coatings doped with a small amount (0.5–2%) of copper. The as grown coatings have low porosity and... more
We have studied the physicomechanical properties (adhesion to steel, microhardness, and wear resistance) of chemical nickel–phosphorus coatings doped with a small amount (0.5–2%) of copper. The as grown coatings have low porosity and stable composition. They are identical in mechanical properties to conventional chemical nickel–phosphorus coatings but exhibit enhanced wear resistance after heat treatment at
a temperature of 600°C. Copper doping improves the corrosion resistance of the coatings in acidified chloride solutions.
a temperature of 600°C. Copper doping improves the corrosion resistance of the coatings in acidified chloride solutions.
Focus on the best available practices. Increase the list of references to 50-60 documents Cite articles by Russian authors Cite your articles (within reasonable limits) Write a correct bibliographic description (name of all authors, title... more
Focus on the best available practices.
Increase the list of references to 50-60 documents
Cite articles by Russian authors
Cite your articles (within reasonable limits)
Write a correct bibliographic description (name of all authors, title of the article, year, volume, number, pages + doi)
Editors should check the completeness and correctness of the indexing of the issue, including the references in the articles
Increase the list of references to 50-60 documents
Cite articles by Russian authors
Cite your articles (within reasonable limits)
Write a correct bibliographic description (name of all authors, title of the article, year, volume, number, pages + doi)
Editors should check the completeness and correctness of the indexing of the issue, including the references in the articles