Zinc phosphate chemical conversion film and method for forming t

Details Zinc phosphate chemical conversion film and method for forming t Zinc phosphate chemical conversion film and method for forming t

1986-11-04

1988-09-27

Swisher, Nancy A. B.

Stock material or miscellaneous articles

Composite

Of metal

2041814, C23C 2207

Patent

active

047741457

ABSTRACT:
A conventional zinc phosphate chemical conversion film formed on an iron article comprises zinc phosphate hydrates, i.e., Zn.sub.3 (PO.sub.4).sub.2.4H.sub.2 O and Zn.sub.2 Fe(PO.sub.4).sub.2.4H.sub.2 O. A novel chemical conversion film is mainly composed of Zn.sub.3 (PO.sub.4).sub.2.2H.sub.2.4H.sub.2 O. The ratio of ##EQU1## is from 0.3 to less than 1. The problems of conventional chemical conversion film arise due to 4 moles of water of crystallization of the zinc phosphates which desiccates at a baking temperature of the paint. The small amount of water of crystallization of Zn.sub.3 (PO.sub.4).sub.2.2H.sub.2 O provides an improved chemical conversion film with respect to the corrosion resistance and the like.

REFERENCES:
patent: 4565585 (1986-01-01), Matsuda
Journal of the Iron and Steel Institute of Japan (Tetsu to Hagane) 69 (13), 121, 1983.
"Metal Surface Technique" 1982, vol. 33, No. 7, p. 345.
Journal of the Iron and Steel Institute of Japan, vol. 66 (1980), No. 7, p. 927.

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