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Barium Chromate 10294-40-3 Used as Anti-rust Pigment

Short Description:

Name: Barium chromate

CAS number: 10294-40-3

Molecular formula: BaCrO4

Molecular weight: 253.3207

EINECS Number: 233-660-5

Melting point: 210 °C (dec.) (lit.)

Density: 4.5 g/mL at 25 °C (lit.)

Form: Powder


Product Detail

Product Tags

Product Detail

Name  Barium chromate
CAS number  10294-40-3
Molecular formula  BaCrO4
Molecular weight  253.3207
EINECS Number  233-660-5
Melting point  210 °C (dec.) (lit.)
Density  4.5 g/mL at 25 °C (lit.)
Form  Powder
Specific gravity  4.5
Color  Yellow
Water solubility  Insoluble in water. Soluble in strong acids.
Precipitation Equilibrium Constant  pKsp: 9.93
Stability  Stable. Oxidizer. May react vigorously with reducing agents.

Synonyms

Bariumcromate;BariumChromate,Puratronic(MetalsBasis);Bariumchromate:chromicacid,bariumsalt;BARIUMCHROMATE;c.i.77103;c.i.pigmentyellow31;Chromicacid(H2-CrO4),bariumsalt(1:1);Chromicacid,bariumsalt(1:1)

Chemical Properties

There are two kinds of barium chrome yellow, one is barium chromate [CaCrO4], and the other is barium potassium chromate, which is a compound salt of barium chromate and potassium chromate. The chemical formula is BaK2(CrO4)2 or BaCrO4·K2CrO4. Chromium Barium Oxide is a cream-yellow powder, soluble in hydrochloric acid and nitric acid, with extremely low tinting strength. The international standard code for barium chromate is ISO-2068-1972, which requires that the content of barium oxide is not less than 56% and the content of chromium trioxide is not less than 36.5%. Barium potassium chromate is lemon-yellow powder. Because of potassium chromate, it has certain water solubility. Its relative density is 3.65, its refractive index is 1.9, its oil absorption is 11.6%, and its apparent specific volume is 300g/L.

Application

Barium chromate cannot be used as a coloring pigment. Because it contains chromate, it has a similar effect to zinc chrome yellow when used in antirust paint. Barium potassium chromate cannot be used as a coloring pigment, but can only be used as an anti-rust pigment, which can replace part of zinc yellow. From the perspective of development trend, it is only one of the varieties of chromate anti-rust pigments available in the coating industry.


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