Chromium Phosphate Hydrate

Chromium Phosphate Hydrate Description

Chromium phosphate hydrate (chromium(III) phosphate hydrate) describes inorganic compounds with the chemical formula CrPO4•x(H2O), where x = 0, 4, or 6. All are deeply colored solids. Anhydrous CrPO4 is green. The hexahydrate CrPO4•6H2O is violet.

Chromium phosphate hydrate is violet crystal(s). It loses water gradually on heating and becomes anhydrous after 1h at 800℃ or 3-4h at 500℃

Paints containing chromium(III) phosphate have been used as corrosion resistant coating for metals. The paints consist of aqueous acidic chromium (III) phosphate solution which convert to a consistent film when applied onto metals heavily used in manufacturing and utility such as zinc, zinc alloy, aluminum and aluminum alloy substrates. Application methods include electroplating, immersing or spraying the solution on the surface of the substrate.

Chromium (III) phosphate has various applications in the polymer industry. Combined chromium(III) aluminum phosphate is widely used as a catalyst in the alkylation of aromatic hydrocarbons using alcohols such as the methylation of toluene using methanol. The alcohol is dehydrated into ether while the alkyl substituted product could be used as an intermediate in the manufacture of synthetic fibers such as poly(ethylene terephthalate).

Pretreatment with chromium (III) phosphate-silicate is also used as a laminated structure to dampen vibration and noise in a motor.

Chromium Phosphate Hydrate Applications and Related Industries

● Anti-corrosive coating

● Catalyst

● Polymer

● Chemical Manufacturing

● Fine Art Materials

● Pigments & Coatings

● Research & Laboratory

Chemical Identifiers

Chromium Phosphate Hydrate Properties (Theoretical)

Chromium Phosphate Hydrate Health & Safety Information