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| Property | Specification 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. |
There are two kinds of barium chrome yellow: one is barium chromate [BaCrO4], 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 a 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.
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 also 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.
