Metal base coating composition comprising chromium, silica and p

Details Metal base coating composition comprising chromium, silica and p Metal base coating composition comprising chromium, silica and p

1986-02-07

1987-03-03

Silverberg, Sam

Metal treatment

Compositions

Heat treating

148 315, C23F 708

Patent

active

046473165

ABSTRACT:
Disclosed is an aqueous metal treatment composition comprising: (a) a hexavalent chromium compound; (b) a compound selected from the group consisting of silica and silicates and mixtures thereof and (c) phosphate. Preferably, the composition also comprises trivalent chromium compound and the respective weight ratios of hexavalent chromium, trivalent chromium, compound selected from the group consisting of silica and silicates and mixtures thereof, and phosphate to 1.0 total chromium by weight are from about 0.6 to 1.0; from 0.0 to about 0.4; from about 0.5 to about 5.0; and from about 0.1 to about 5.0, respectively. A metal surface can be coated with the aqueous metal treatment composition and then cured to provide a coated metal product having good corrosion resistance, paint adhesion characteristics and formability.

REFERENCES:
patent: 2529206 (1950-11-01), Winslow
patent: 3462319 (1969-08-01), Campell
patent: 3556869 (1971-01-01), Okada
patent: 3562011 (1971-02-01), Hirst
patent: 3720549 (1973-03-01), Hirst
patent: 3798074 (1974-03-01), Esler
patent: 4169741 (1979-10-01), Lampatzer

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