The various fields for uses of chromium oxide are tabulated below-
- Laboratory
- Metallurgy
- Semiconductor
- Welding
- Colorant
- Manufacturing
Laboratory
Chromium oxide is used as a catalyst to prepare some organic reactions such as methanol preparation, oxidation of chlorinated hydrocarbons, polymerization of butadienes, etc.
Metallurgy
Cr2O3 is used in making refractory brick for lining metallurgical and glass kilns because of its high melting point (2300 oC).
Semiconductor
Chromium oxide behaves as semiconductor.
Welding
A passive film of chromium oxide is formed on the welded portion during the welding process.
Colorant
- Chromium oxide gives the stainless character of steel used for canned foods.
- By adding Cr2O3, a green color is provided to glasses during their manufacture.
Manufacturing
- Chromium oxide is used in the manufacturing of chromium metal by thermal reduction of Cr2O3 by a more reactive metal such as aluminum.
- Chromium oxide is used as a magnetic pigment in magnetic audio and video tapes for information storage.
- Cr2O3 is used as a polishing agent for versatile purposes such as gemstones, diamonds, glass, etc.
Conclusion
In conclusion, chromium oxide is also known as dichromium trioxide or chromia. It is an amphoteric, water-insoluble green-colored solid but it can react with acids. The oxidation state of chromium in this oxide is +3.
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