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This red solid has a melting point of 30 °C and a boiling point of 117 °C.It can be prepared by treating chromium metal with fluorine at 400 °C and 200 bar pressure.This kind of reaction is also observed with solutions of chrome alum and other water-soluble chromium(III) salts.Chromium(III) hydroxide (Cr(OH) Sodium chromate is produced industrially by the oxidative roasting of chromite ore with calcium or sodium carbonate.
It is very dense, and prevents the diffusion of oxygen into the underlying metal.
This is different from the oxide that forms on iron and carbon steel, through which elemental oxygen continues to migrate, reaching the underlying material to cause incessant rusting.
because many chromium compounds are intensely colored.
Ferrochromium alloy is commercially produced from chromite by silicothermic or aluminothermic reactions and chromium metal by roasting and leaching processes followed by reduction with carbon and then aluminium.