Overview of Chromium

Chromium is a silver-white metal, hard and brittle. Density of 7.20 g / cm 3. Melting point of 1857 ± 20 ℃, boiling point 2672 ℃.Valence +2, +3 and +6. Ionization energy of 6.766 eV. Chromium metal in acid to the surface passivation of its general characteristics.Once to the passivated,which is easy to dissolve in almost all of the inorganic acid, but insoluble in nitric acid. Chromium is soluble in sulfuric acid, which is not soluble in nitric acid. By water vapor at high temperature oxidation at 1000 ℃ was the oxidation of carbon monoxide. At high temperatures, chromium reacts with the nitrogen and to the erosion of the molten alkali metal.Soluble in alkali solution. High corrosion resistance of chromium in the air, even in a state of red heat, oxidation is very slow. Insoluble in water.