Chromium trioxide (chromium trioxide), chromic anhydride, molecular formula CrO3, molecular weight 99.99. Dark red or dark purple rhombohedral crystals, easily deliquescent. It decomposes when heated to the melting point and completely decomposes when heated to the boiling point. Used in the production of chromium compounds, oxidizers, catalysts, but also used in wood preservation, electroplating and so on. Produced by the reaction of concentrated sulfuric acid and potassium dichromate.

Use

1. Mainly used in electroplating industry, do bicycle, sewing machine, watches, meters, flashlights, daily-use hardware, such as chromium plating of raw materials, but also for the system of high-purity chromium metal. It is the raw material for the manufacture of chromium oxide green and zinc chromium yellow; it is also the raw material for the production of low-temperature transformation catalyst, high-temperature transformation catalyst and high-pressure methanol synthesis catalyst. It is used as mordant when dyeing wool fabrics and as oxidizing agent in printing and dyeing industry. In addition, it is also used for wood preservation.

2. Used as the catalyst for medium pressure polyethylene production by Phillip's method.

3. An important chromium compounds, chromic anhydride is the most important raw material for the electroplating industry, used as the main raw material for chromium plating. Most of the chromic anhydride consumption in the electroplating industry. Chromic anhydride is a good oxidizing agent, can be used for bleaching, refining, but also can be used as a raw material for dyes, mordants, tanning agents and catalysts for organic synthesis reactions. In addition, it is also used in medicine, ceramics, colored glass and other industries.

4. Used as analytical reagent, strong oxidizer and chromate preparation.

5. Used as catalyst for synthesizing polyethylene. Also used in chromium plating, mordant and preparation of pure metal chromium.

6. In the galvanizing passivation in the passivation of zinc plating layer is mostly used in chromic anhydride, which is the main component of the film. In the chemical oxidation of aluminum and alloys, chromic anhydride is the oxidizing agent in the solution, which is an indispensable component for the formation of the film layer.

7. Used in electroplating industry, pharmaceutical industry, printing industry, tanning and fabric dyeing.

Another Name

Chromic Anhydride

Formula

CrO₃

Molecular Mass

99.99

CAS Login Number

1333-82-0

EINECS Registration Number...

215-607-8

Melting Point

196℃

Boiling

250 ℃(Disassembly)

Solubility

1660g/L(20℃)

Densities

2.7

Appearances

Dark red rhombohedral crystals

Appliance

Electroplating industry, pharmaceutical industry, printing industry, tanning and fabric mordanting.