Protection of Metals and Physical Chemistry of Surfaces, Mar 1, 2016
Ketoprofen (KETO) was studied as a corrosion inhibitor for copper in 0.5 M HCl solution using exp... more Ketoprofen (KETO) was studied as a corrosion inhibitor for copper in 0.5 M HCl solution using experimental (potentiodynamic polarization curves) and quantum chemical methods. The results obtained from the experiments demonstrated that inhibition efficiency increases with an increase in the concentration of KETO. Additionally, the results of potentiodynamic polarization curves demonstrated that KETO is a mixed-type inhibitor. The adsorption of KETO on a copper surface followed a Langmuir adsorption isotherm. The adsorption equilibrium constant and adsorption free energy were calculated from a Langmuir adsorption isotherm. Density functional theory (DFT) was used for theoretical calculations. The corrosion inhibition efficiencies of non-protonated (neutral) and protonated forms of KETO were determined in both the gas and aqueous phases. The calculated parameters for the various protonated and non-protonated KETO forms were compared with one another.
In this work, the corrosion behavior of iron and aluminum was investigated in 0.1 M NaCl solution... more In this work, the corrosion behavior of iron and aluminum was investigated in 0.1 M NaCl solutions with an initial pH value of 8 and containing various concentrations (0, 30, 150, 300 ppm) of benzoic acid. For this purpose, the anodic and cathodic semilogarithmic current-potential curves, weight loss and pH of the solution were determined over time. The changes in the concentrations of benzoic acid in the solutions with time were determined by a UV spectrophotometer. According to the results obtained in this investigation, benzoic acid in 0.1 M NaCl acts on iron and aluminum as an inhibitor. This effect gets stronger with increasing concentrations of benzoic acid in 0.1 M NaCl solution.
The electrochemical behaviour of linear alklybenzene sulfonate (LAS) on Pt electrodes was investi... more The electrochemical behaviour of linear alklybenzene sulfonate (LAS) on Pt electrodes was investigated in 0.05M Na2 SO4 and in 0.1M NaCl at pH=8 by the potentiokinetic method and by electrolysis. The anodic and cathodic semilogarithmic current-potential curves were obtained between -1.6V +1.6V. The experimental discharge potentials were determined by means of current-potential-curves obtained by electrolysis between 0-3V. The percentages of surface active material remaining in the solution after specified periods (0-6hrs) were determined for different initial concentrations of LAS (30, 150, 300 ppm) by using a potentiostat at +1.6V and by applying a potential of 20V via a direct current source. The concentrations of LAS in the solution were determined with a UV spectrophotometer. The results indicate that when a potential of 20V is applied on the electrodes the concentrations of surface active materials (LAS) decrease by 40-50% at the end of 6 hours in 0.05M Na 2 SO4 solution.
In this study, photocatalytic activities of polyaniline-modified TiO2 and ZnO were examined by ph... more In this study, photocatalytic activities of polyaniline-modified TiO2 and ZnO were examined by photodegradation of Sunfix red S3B reactive dye under visible light. The nanocomposites have been synthesized by in situ oxidative polymerization method. Structural, morphological, and optical characteristics of the prepared photocatalysts were analyzed by Fourier transform infrared spectroscopy and scanning electron microscopy techniques. The results showed that photocatalytic activities of the synthesized nanocomposites have increased due to increasing density of electrons in TiO2 and ZnO. Irradiation tests were performed to investigate the impacts of photocatalyst amount, initial dye concentration, and irradiation period on photodegradation efficiency. Strength and direction of the relationships between the experimental conditions and the obtained photocatalytic efficiencies were also examined by bivariate correlation analysis. Photocatalyst amount was found to be the most effective factor in the process with correlation coefficients of 0.76 and 0.77 for PANI/TiO2 and PANI/ZnO, respectively. In the final stage of the work, artificial neural networks were applied to predict the photodegradation efficiencies of the synthesized nanocomposites, individually. The chosen network architecture provided good prediction performances for both of the nanocomposite types.
PurposeThe purpose of this paper is to understand corrosion behavior of different Cu‐containing A... more PurposeThe purpose of this paper is to understand corrosion behavior of different Cu‐containing Al‐Si‐x% Cu alloys (x: 1 wt% Cu, 2 wt% Cu, 3 wt% Cu, 4 wt% Cu, and 5 wt% Cu) in 0.1 M HCl and 0.1 M H2SO4.Design/methodology/approachPotentiodynamic, chronoamperometric and impedance measurements were applied to specimens to obtain their electrochemical characteristics. For the long‐term analyses, hydrogen evolution with immersion time (V‐t) was measured. The corroded surfaces of the alloys were investigated using scanning electron microscopy (SEM) to understand the corrosion mechanism.FindingsAll experimental investigations showed that the corrosion resistance of alloys increased with increasing Cu content in the alloys.Research limitations/implicationsCu‐containing aluminum alloys are age‐hardenable alloys. The corrosion behaviour of these alloys can be changed by heat treatment. Corrosion test results for the heat treated and aged alloys will be discussed in another study.Originality/v...
In this work, the corrosion behavior of iron and aluminum was investigated in 0.1 M NaCl solution... more In this work, the corrosion behavior of iron and aluminum was investigated in 0.1 M NaCl solutions with an initial pH value of 8 and containing various concentrations (0, 30, 150, 300 ppm) of benzoic acid. For this purpose, the anodic and cathodic semilogarithmic current-potential curves, weight loss and pH of the solution were determined over time. The changes in the concentrations of benzoic acid in the solutions with time were determined by a UV spectrophotometer. According to the results obtained in this investigation, benzoic acid in 0.1 M NaCl acts on iron and aluminum as an inhibitor. This eect gets stronger with increasing concentrations of benzoic acid in 0.1 M NaCl solution.
PANi kaplanmis elektrot yuzeyi donusumlu voltametri teknigiyle bakir ve nikelle kaplanmistir. Kap... more PANi kaplanmis elektrot yuzeyi donusumlu voltametri teknigiyle bakir ve nikelle kaplanmistir. Kaplanmamis ve PANi, PANi│metal kompozitleri ile kaplanmis bakirin korozyon davranislari 0,1 M H 2 SO 4 cozeltisinde potansiyodinamik polarizasyon ve empedans olcumleri ile belirlenmistir. Bakir yuzeyinde olusturulan PANi, PANi│metal kompozit filmlerinin yuzey analizleri SEM ile incelenmistir. Olcum sonuclari PANi│Ni kompozit filminin korozyon direncini arttirdigini gostermistir.
Protection of Metals and Physical Chemistry of Surfaces, Mar 1, 2016
Ketoprofen (KETO) was studied as a corrosion inhibitor for copper in 0.5 M HCl solution using exp... more Ketoprofen (KETO) was studied as a corrosion inhibitor for copper in 0.5 M HCl solution using experimental (potentiodynamic polarization curves) and quantum chemical methods. The results obtained from the experiments demonstrated that inhibition efficiency increases with an increase in the concentration of KETO. Additionally, the results of potentiodynamic polarization curves demonstrated that KETO is a mixed-type inhibitor. The adsorption of KETO on a copper surface followed a Langmuir adsorption isotherm. The adsorption equilibrium constant and adsorption free energy were calculated from a Langmuir adsorption isotherm. Density functional theory (DFT) was used for theoretical calculations. The corrosion inhibition efficiencies of non-protonated (neutral) and protonated forms of KETO were determined in both the gas and aqueous phases. The calculated parameters for the various protonated and non-protonated KETO forms were compared with one another.
In this work, the corrosion behavior of iron and aluminum was investigated in 0.1 M NaCl solution... more In this work, the corrosion behavior of iron and aluminum was investigated in 0.1 M NaCl solutions with an initial pH value of 8 and containing various concentrations (0, 30, 150, 300 ppm) of benzoic acid. For this purpose, the anodic and cathodic semilogarithmic current-potential curves, weight loss and pH of the solution were determined over time. The changes in the concentrations of benzoic acid in the solutions with time were determined by a UV spectrophotometer. According to the results obtained in this investigation, benzoic acid in 0.1 M NaCl acts on iron and aluminum as an inhibitor. This effect gets stronger with increasing concentrations of benzoic acid in 0.1 M NaCl solution.
The electrochemical behaviour of linear alklybenzene sulfonate (LAS) on Pt electrodes was investi... more The electrochemical behaviour of linear alklybenzene sulfonate (LAS) on Pt electrodes was investigated in 0.05M Na2 SO4 and in 0.1M NaCl at pH=8 by the potentiokinetic method and by electrolysis. The anodic and cathodic semilogarithmic current-potential curves were obtained between -1.6V +1.6V. The experimental discharge potentials were determined by means of current-potential-curves obtained by electrolysis between 0-3V. The percentages of surface active material remaining in the solution after specified periods (0-6hrs) were determined for different initial concentrations of LAS (30, 150, 300 ppm) by using a potentiostat at +1.6V and by applying a potential of 20V via a direct current source. The concentrations of LAS in the solution were determined with a UV spectrophotometer. The results indicate that when a potential of 20V is applied on the electrodes the concentrations of surface active materials (LAS) decrease by 40-50% at the end of 6 hours in 0.05M Na 2 SO4 solution.
In this study, photocatalytic activities of polyaniline-modified TiO2 and ZnO were examined by ph... more In this study, photocatalytic activities of polyaniline-modified TiO2 and ZnO were examined by photodegradation of Sunfix red S3B reactive dye under visible light. The nanocomposites have been synthesized by in situ oxidative polymerization method. Structural, morphological, and optical characteristics of the prepared photocatalysts were analyzed by Fourier transform infrared spectroscopy and scanning electron microscopy techniques. The results showed that photocatalytic activities of the synthesized nanocomposites have increased due to increasing density of electrons in TiO2 and ZnO. Irradiation tests were performed to investigate the impacts of photocatalyst amount, initial dye concentration, and irradiation period on photodegradation efficiency. Strength and direction of the relationships between the experimental conditions and the obtained photocatalytic efficiencies were also examined by bivariate correlation analysis. Photocatalyst amount was found to be the most effective factor in the process with correlation coefficients of 0.76 and 0.77 for PANI/TiO2 and PANI/ZnO, respectively. In the final stage of the work, artificial neural networks were applied to predict the photodegradation efficiencies of the synthesized nanocomposites, individually. The chosen network architecture provided good prediction performances for both of the nanocomposite types.
PurposeThe purpose of this paper is to understand corrosion behavior of different Cu‐containing A... more PurposeThe purpose of this paper is to understand corrosion behavior of different Cu‐containing Al‐Si‐x% Cu alloys (x: 1 wt% Cu, 2 wt% Cu, 3 wt% Cu, 4 wt% Cu, and 5 wt% Cu) in 0.1 M HCl and 0.1 M H2SO4.Design/methodology/approachPotentiodynamic, chronoamperometric and impedance measurements were applied to specimens to obtain their electrochemical characteristics. For the long‐term analyses, hydrogen evolution with immersion time (V‐t) was measured. The corroded surfaces of the alloys were investigated using scanning electron microscopy (SEM) to understand the corrosion mechanism.FindingsAll experimental investigations showed that the corrosion resistance of alloys increased with increasing Cu content in the alloys.Research limitations/implicationsCu‐containing aluminum alloys are age‐hardenable alloys. The corrosion behaviour of these alloys can be changed by heat treatment. Corrosion test results for the heat treated and aged alloys will be discussed in another study.Originality/v...
In this work, the corrosion behavior of iron and aluminum was investigated in 0.1 M NaCl solution... more In this work, the corrosion behavior of iron and aluminum was investigated in 0.1 M NaCl solutions with an initial pH value of 8 and containing various concentrations (0, 30, 150, 300 ppm) of benzoic acid. For this purpose, the anodic and cathodic semilogarithmic current-potential curves, weight loss and pH of the solution were determined over time. The changes in the concentrations of benzoic acid in the solutions with time were determined by a UV spectrophotometer. According to the results obtained in this investigation, benzoic acid in 0.1 M NaCl acts on iron and aluminum as an inhibitor. This eect gets stronger with increasing concentrations of benzoic acid in 0.1 M NaCl solution.
PANi kaplanmis elektrot yuzeyi donusumlu voltametri teknigiyle bakir ve nikelle kaplanmistir. Kap... more PANi kaplanmis elektrot yuzeyi donusumlu voltametri teknigiyle bakir ve nikelle kaplanmistir. Kaplanmamis ve PANi, PANi│metal kompozitleri ile kaplanmis bakirin korozyon davranislari 0,1 M H 2 SO 4 cozeltisinde potansiyodinamik polarizasyon ve empedans olcumleri ile belirlenmistir. Bakir yuzeyinde olusturulan PANi, PANi│metal kompozit filmlerinin yuzey analizleri SEM ile incelenmistir. Olcum sonuclari PANi│Ni kompozit filminin korozyon direncini arttirdigini gostermistir.
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