Product name: Chromium trioxide
Other names: Chromium(VI) oxide
Chemical formula: CrO3
CAS: 1333-82-0
Content: 99%
Origin: Russia
Packing: 50kg/carton

Chromium trioxide or Chromium (VI) oxide is an inorganic compound with the chemical formula CrO3. Under normal conditions, it is a solid compound, in the form of thin pieces or pellets with a purple-red color, when wet it turns bright orange. This acid is soluble in water and is a very strong oxidizing chemical. Mainly used in electroplating, synthetic ruby production, ceramic production, paint, metallurgy, wood treatment, dyeing…

Typical physical and chemical properties of Chromium trioxide
Chromium(VI) oxide exists in the solid state, in the form of thin sheets or thin pellets that are purple-red in color when dry.
CrO3 is an odorless, hygroscopic, dark red, corrosive chemical and a strong oxidizer.
Density is 3.25 g/cm3
Melting point reaches 197 °C (470 K, 387 °F)
Boiling point is 250 °C (523 K, 482 °F)
Solubility 164.8 g/100 mL (0 ℃)
Chromium(VI) oxide decomposes to form Cr2O3 and releases oxygen gas.
4CrO3 → 2Cr2O3 + 3O2↑

Reaction with liquid caustic soda solution:
2NaOH + CrO3 → H2O + Na2CrO4

Reaction with acid solution:
12HCl + 2CrO3 → 3Cl2 + 2CrCl3 + 6H2O

Reacts with water to form dichromic acid:
H2O + 2CrO3 → H2Cr2O7

How to produce and prepare Chromium trioxide?
– Let concentrated H2SO4 acid react with saturated solution of Potassium dichromate or Potassium chromate:

K2Cr2O7 + 2H2SO4 → 2KHSO4 + 2CrO3 + H2O

Applications of Chromium(VI) oxide chemicals in life and production
– The leading application of Chromium(VI) oxide is in chrome plating: CrO3 is often combined with additives that affect the plating process but they do not react with trioxides. At the same time, these trioxides will react with cadmium, zinc, and other metals to passivate chromium to prevent corrosion.

– Chromium(VI) oxide is used in the production of synthetic gemstones (rubies) thanks to the compound’s excellent coloring ability.

– In the textile, dyeing, painting and printing industries: Chromium(VI) oxide is a strong oxidizing chemical that creates beautiful color complexes and is used as a fabric color fixative, so it is commonly used in textile dyeing and printing.

– In repairing brass musical instruments: When people combine CrO3 and H2SO4, it will produce H2CrO4, a solution with strong oxidizing and corrosive properties. They have the effect of brightening brass materials, helping to leave a bright yellow patina on the brass while adding value and aesthetics to the product. In addition, this compound also has the effect of cleaning glass, treating and preserving wood.

Notes on use and storage of Chromium trioxide
– Although it has many important applications in production life, Chromium(VI) oxide is also a chemical with strong oxidizing and corrosive properties. It will cause burns and skin corrosion if in direct contact, and can easily cause fire or explosion due to its strong oxidizing properties. At the same time, they are also quite toxic and have the risk of causing cancer, so it is necessary to be fully equipped with chemical safety protection equipment when exposed.

– As a substance that is harmful to the environment, it is necessary to strictly follow the regulations on chemical use, use in small amounts and absolutely prohibit the discharge of untreated waste into the natural environment.

– It is a strong oxidizing and corrosive substance so it must be stored in a sealed container with an epoxy coating. Avoid storing with flammable substances such as solvents, fabrics, paper, etc.