Coating processes – With pretreatment of the base – Etching – swelling – or dissolving out part of the base
Patent
1974-07-25
1976-09-21
Hayes, Lorenzo B.
Coating processes
With pretreatment of the base
Etching, swelling, or dissolving out part of the base
427328, 427345, 427436, 148 627, 106 1, C23C 300
Patent
active
039820556
ABSTRACT:
A method for preparing aluminum or aluminum alloy bodies to receive an electrically deposited surface coating is disclosed. The method includes degreasing the body, if necessary, etch cleaning and zinc coating the body, washing and drying the etch cleaned and zinc-coated body, etching the dried body in 40.degree. Baume nitric acid or, when the body is an alloy of aluminum containing as much as about 2 percent of silicon, in 40.degree. Baume nitric acid which also contains from 11/2 to 3 percent of ammonium bifluoride, washing the etched body in cold running water, zincating the washed body and washing the zincated body in cold running water. The baths used in the various steps of the method of the invention and the times and temperatures used, are set forth in the following Table wherein percentages are by weight:
REFERENCES:
patent: 2650886 (1953-09-01), Zelley
patent: 3216835 (1965-11-01), Saubestre
patent: 3235404 (1966-02-01), Mickelson et al.
patent: 3329522 (1967-07-01), Saubestre et al.
patent: 3532519 (1970-10-01), Hirohata et al.
Eltra Corporation
Hayes Lorenzo B.
Purdue John C.
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