Compositions and processes for producing chromium conversion coa

Details Compositions and processes for producing chromium conversion coa Compositions and processes for producing chromium conversion coa

1976-11-01

1978-11-07

Goolkasian, John T.

Metal treatment

Compositions

Heat treating

106 1421, C23F 726

Patent

active

RE0298271

ABSTRACT:
In a process for producing a chromium protective coating on a zinc or cadmium surface the surface has applied thereto an aqueous composition including chromium, perchlorate and fluoride ions with the chromium ion being the only metal ion present before application to the surface. The apparatus by which the composition is applied to a strip moving through an application station includes a provision for rinsing the surface if the strip is stopped for longer than a predetermined time in the station.

REFERENCES:
patent: 2106227 (1938-01-01), Scharschu
patent: 2786002 (1957-03-01), Van et al.
patent: 3116176 (1963-12-01), Fuchs
patent: 3287179 (1966-11-01), Frank
patent: 3331710 (1967-07-01), Lodeesen et al.
patent: 3481797 (1969-12-01), Leland
patent: 3553034 (1971-01-01), Harvey et al.
patent: 3620777 (1971-11-01), Okabe
patent: 3660172 (1972-05-01), Otto
patent: 3706604 (1972-12-01), Plaxton
patent: 3752707 (1973-08-01), Laird et al.
patent: 3857739 (1974-12-01), Prust et al.
Merck Index, 7th Edition, pp. 785, 533, 1960.

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