Zinc phosphate

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Zinc phosphate
Zinc phosphate
Other names
Molecular formula Zn3(PO4)2
Molar mass 386.11 g/mol
Appearance white crystals
Crystal structure monoclinic
CAS number [7779-90-9]
Density and phase 4 g/cm3, solid
Solubility insoluble in water
Melting point 900°C
Boiling point ?
EU classification not listed
NFPA 704
Except where noted otherwise, data are given for
materials in their standard state (at 25 °C, 100 kPa)
Infobox disclaimer and references

Zinc phosphate (Zn3(PO4)2) is an inorganic chemical compound used as a corrosion resistant coating on metal surfaces either as part of an electroplating process or applied as a primer pigment (see also red lead). Zinc phosphate coats better on a crystalline structure than bare metal, so a seeding agent is often used as a pre-treatment. One common agent is sodium pyrophosphate[1]


  1. Menke, Joseph T. "Zinc Phosphate Coatings on NonFerrous Substrates -- Part I". PFOnline. Retrieved 2006-08-07.

External links