Chromium is used in electroplating for glossy chrome plating, hard and black chromium plating, as a catalyst in the chemical industry but also in steel production. Chromium is one of the most important alloying elements for producing rustproof and heat-resistant steels.
Chromium is one of the most important alloying elements for producing corrosion and heat resistant steels. it is added to steel to make it oil- or air-hardenable. Chromium is a carbide former in alloys. These carbides significantly increase cutting properties, resistance to wear and also high-temperature strength. To achieve corrosion resistance, at least 10,5% chromium must be added to the steel.
|Rust resistance||Improvement||+ 3|
|Yield strength||Improvement||+ 2|
|Heat resistance||Improvement||+ 1|
|Carbide formation||Improvement||+ 2|
|Wear resistance||Improvement||+ 1|
|Reduction of area||Decrease||- 1|
|Notched Impact Strength||Decrease||- 1|
The French chemist and pharmacist Louis-Nicolas Vauquelin discovered the element as early as 1798 and called it chromium because of the many colours of its salts. Traces of the element can also be found in precious stones such as rubies and emeralds.
In the 19th century it was mainly used for colour pigments and in the tannery for leather production. One of the best known pigments is chrome yellow, the identification color of the German Post.
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