Chromium
Chromium is a chemical element with symbol Cr and atomic number 24. It is the first element in Group 6. It is a steely-grey, lustrous, hard and brittle metal which takes a high polish, resists tarnishing, and has a high melting point. The name of the element is derived from the Greek word χρῶμα, chrōma, meaning color, because many of its compounds are intensely colored.
Chromium oxide was used by the Chinese in the Qin dynasty over 2,000 years ago to coat metal weapons found with the Terracotta Army. Chromium was discovered as an element after it came to the attention of the Western world in the red crystalline mineral crocoite (lead(II) chromate), discovered in 1761 and initially used as a pigment. Louis Nicolas Vauquelin first isolated chromium metal from this mineral in 1797. Since Vauquelin's first production of metallic chromium, small amounts of native (free) chromium metal have been discovered in rare minerals, but these are not used commercially. Instead, nearly all chromium is commercially extracted from the single commercially viable ore chromite, which is iron chromium oxide (FeCr2O4). Chromite is also now the chief source of chromium for chromium pigments.
Hexavalent chromium
Hexavalent chromium (chromium(VI), Cr(VI)) refers to chemical compounds that contain the element chromium in the +6 oxidation state. Virtually all chromium ore is processed via hexavalent chromium, specifically the salt sodium dichromate. Approximately 136,000 tonnes (300,000,000 lb) of hexavalent chromium was produced in 1985. Other hexavalent chromium compounds are chromium trioxide and various salts of chromate and dichromate. Hexavalent chromium is used in textile dyes, wood preservation, and as anti-corrosion and conversion coatings and a variety of niche uses. Chromium hexavalent compounds exist in several forms. Industrial uses of hexavalent chromium compounds include chromate pigments in dyes, paints, inks, and plastics; chromates added as anticorrosive agents to paints, primers, and other surface coatings; and chromic acid electroplated onto metal parts to provide a decorative or protective coating. Hexavalent chromium can be formed when performing "hot work" such as welding on stainless steel or melting chromium metal. In these situations the chromium is not originally hexavalent, but the high temperatures involved in the process result in oxidation that converts the chromium to a hexavalent state.(29 CFR OSHA General Industry 1910)
Chromium (disambiguation)
Chromium is a chemical element.
Chromium may also refer to:
- Chromium OS, the open source operating system counterpart to Google Chrome OS
See also
Podcasts:
Chromium
ALBUMS
- Star to Star released: 1979
- Star to Star released: 1979
Chromium
ALBUMS
- Chromium released: 2011
- Confessions of a Hero released: 2008
- Intro Spectre released: 2006
Chromium
ALBUMS
- A Voyage Into Trance, Volume 3 released: 1998
- A.R.C.: Artist Remix Collection released: 1998
- Platipus Records, Volume 4 released: 1998
- Chrome released: 1997
A.R.C.: Artist Remix Collection
Released 1998- Scared (POB Seismix)
- Waterfront (Union Jack mix)
- Going Up (Granny remix)
- Magic (The Seismix by POB)
- Chrome (Remixed by Terra Ferma)
- Strata (Clanger remix)
- Lust (Art of Trance remix)
- Do You Wanna Know (Gut Drum - POB remix) (feat. Jimi Polo)
- Warriors Groove (Poltergeist remix)
- Break 4 Love (Gut Drum - POB remix)
-
by Chromium
-
by Chromium
-
by Chromium
-
by Chromium
-
by Chromium
-
by Chromium
-
by Chromium
-
by Chromium
-
by Chromium
-
by Chromium
-
by Chromium
-
by Chromium
-
by Chromium
-
by Chromium
-
by Chromium
-
by Chromium
-
by Chromium
-
by Chromium
-
by Chromium
-
by Chromium
-
by Chromium
-
by Chromium
-
by Church
-
by Chromium
-
by Chromium
-
by Chromium
-
by Chromium
-
by Chromium
-
by Chromium
-
by Chromium
-
by Chromium
-
by Chromium
-
by Chromium
-
by The Church
WALKING IN YOUR SHADOW
by: ChromiumWhere were you
When I needed
To find a way
Lost in life
Wanting escape,
Already there
Where was I
When I needed
A push to stay
Am I here
Or lost in
A wanted shame?
But I know
Here I am,
Walking in your shadow
But you never noticed
Here we are, one and one together
But it'll never find
Where were we
When we needed
Some piece of mind
But I know
Here I am,
Walking in your shadow
But you never noticed
Here we are, one and one together
But it'll never find
You'll miss it when it's gone
You'll miss it when it's gone
You'll miss it when it's gone
Here I am,
Walking in your shadow
But you never noticed
Here we are, one and one together
But it'll never find
You'll miss it when it's gone
You'll miss it when it's gone
Latest News for: chromium
First Atlantic Nickel Intersects 0.23% Nickel and 0.31% Chromium Over 366 Meters in Third Drill ...
First Atlantic Nickel Intersects 0.23% Nickel and 0.31% Chromium Over 366 Meters in Third Drill Hole at RPM Zone, Confirming at Least 500-Meter Mineralized Width (First Atlantic Nickel Corp)
First Atlantic Nickel Reports DTR Metallurgical Results from RPM Hole 2: Magnetic Concentrate of 1.32% Nickel & 1.95% Chromium Over Entire 216 Meter Drill Hole (First Atlantic Nickel Corp)
TPU physicists: chromium coating proves efficient for accident-tolerant nuclear fuel (Tomsk Polytechnic University)
Study tracks chromium chemistry in irradiated molten salts
Nickel, Chromium, PGE exploration license executed in Chhattisgarh's Mahasamund
- 1