Potassium Chromate is a lemon yellow monoclinic crystal, its CAS number is 7789-00-6, the chemical formula is CrK₂O₄, and the molecular weight is 194.1903. Its density is 1.00 g/ml at 20 degrees Celsius, and its melting point is 971 degrees Celsius (literature value). Its solubility in water at 20 degrees Celsius is 640 g/L, and its vapor density is 6.7 (compared to air), which is soluble in water. At 20 degrees Celsius, the pH value of its 50 g/L aqueous solution is between 9.0 and 9.8. The storage condition of this substance is to store it below 30 degrees Celsius.
Potassium Chromate
Potassium Chromate has many uses:
- Indicator: It is often used as an indicator in the determination of halides by silver titration.
- Passivator: It is used for passivation treatment of metal surfaces, which can form a dense passivation film on the metal surface to improve the corrosion resistance and oxidation resistance of the metal.
- Corrosion inhibitor: It is added to some corrosive media, such as cooling water systems, electroplating solutions, etc., to play a corrosion inhibition role. It can form an adsorption film or reaction film on the metal surface, inhibit the anodic dissolution of the metal or the cathodic hydrogen evolution process, thereby reducing the corrosion rate of the metal and extending the service life of the metal equipment.
- Pigment industry: It is one of the important raw materials for the production of chrome yellow pigments. Chrome yellow pigment has bright colors and good hiding power. It is widely used in coatings, inks, plastics, rubber and other industries for coloring and decoration of products.
- Other fields: In the printing and dyeing industry, it can be used as a mordant to help the dye adhere better to the fabric and improve the dyeing effect. It may be used in the synthesis of some pharmaceutical intermediates, participating in certain organic synthesis reactions to construct specific chemical structures. It can also be used as an oxidant in fireworks, combined with other ingredients to produce specific colors and effects.
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