Zinc phosphate

Zinc phosphate
Names
	IUPAC name Zinc phosphate
Identifiers
CAS Number	7779-90-0 ;
3D model (JSmol)	Interactive image;
ChemSpider	22927 ;
ECHA InfoCard	100.029.040
PubChem CID	24519;
RTECS number	TD0590000;
UNII	1E2MCT2M62 ;
CompTox Dashboard (EPA)	DTXSID3064807 ;
	InChI InChI=1S/2H3O4P.3Zn/c21-5(2,3)4;;;/h2(H3,1,2,3,4);;;/q;;3+2/p-6 Key: LRXTYHSAJDENHV-UHFFFAOYSA-H ; InChI=1/2H3O4P.3Zn/c21-5(2,3)4;;;/h2(H3,1,2,3,4);;;/q;;3+2/p-6 Key: LRXTYHSAJDENHV-CYFPFDDLAR;
	SMILES [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])(=O)[O-].[O-]P([O-])([O-])=O;
Properties
Chemical formula	H4O12P2Zn3
Molar mass	454.11 g·mol−1
Appearance	white solid
Density	3.998 g/cm3
Melting point	900 °C (1,650 °F; 1,170 K)
Boiling point	158 °C (316 °F; 431 K)
Solubility in water	insoluble
Magnetic susceptibility (χ)	−141.0·10−6 cm3/mol
Refractive index (nD)	1.595
Structure
Crystal structure	monoclinic
Thermochemistry
Std enthalpy of; formation (ΔfH⦵298)	− 2891.2 ± 3.3
Hazards
NFPA 704 (fire diamond)	2 0 0
Flash point	Non-flammable
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Zinc phosphate is an inorganic compound with the formula Zn₃(PO₄)₂. This white powder is widely 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). It has largely displaced toxic materials based on lead or chromium, and by 2006 it had become the most commonly used corrosion inhibitor.^[1]^[2] 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.^[3]

^ Kalendov´a, A.; Kalenda, P.; Vesel´y, D. (2006). "Comparison of the efficiency of inorganic nonmetal pigments with zinc powder in anticorrosion paints". Progress in Organic Coatings. 57. Elsevier: 1–10. doi:10.1016/j.porgcoat.2006.05.015.
^ Etzrodt, G. (2012). "Pigments, Inorganic 5. Anticorrosive Pigments". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.n20_n04. ISBN 978-3527306732.
^ Menke, Joseph T. "Zinc Phosphate Coatings on NonFerrous Substrates -- Part I". PFOnline. Retrieved 2006-08-07.

[Kalendov´a2006-1] Kalendov´a, A.; Kalenda, P.; Vesel´y, D. (2006). "Comparison of the efficiency of inorganic nonmetal pigments with zinc powder in anticorrosion paints". Progress in Organic Coatings. 57. Elsevier: 1–10. doi:10.1016/j.porgcoat.2006.05.015.

[Ull-2] Etzrodt, G. (2012). "Pigments, Inorganic 5. Anticorrosive Pigments". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.n20_n04. ISBN 978-3527306732.

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

[1]

[2]

[3]