Method for the surface treatment of metals

Details Method for the surface treatment of metals Method for the surface treatment of metals

1978-03-09

1979-10-02

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 62, C23F 726

Patent

active

041697413

ABSTRACT:
An aqueous acidic composition free of hexavalent chromium is employed to treat a metal surface. The composition contains trivalent chromium, phosphate ion and dispersed silica.

REFERENCES:
patent: 3421949 (1969-01-01), Halversen
patent: 3562011 (1971-02-01), Hirst et al.
patent: 3705826 (1972-12-01), Hirst et al.
patent: 3706603 (1972-12-01), Vessey et al.
patent: 3720549 (1973-03-01), Hirst et al.

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