Tank process for plating aluminum substrates including porous al

Details Tank process for plating aluminum substrates including porous al Tank process for plating aluminum substrates including porous al

1981-05-19

1982-08-24

Kendall, Ralph S.

Coating processes

With pretreatment of the base

Metal base

427405, 427406, 427436, 427438, C23C 302

Patent

active

043461280

ABSTRACT:
An improved tank process for plating aluminum substrates which is especially advantageous for plating porous aluminum castings and, blister-free plated aluminum substrates produced thereby, characterized in that the aluminum piece parts are: (i) emulsion cleaned in a room temperature alkaline cleaner; (ii) immersed in a room temperature dilute acid, inorganic, fluoride salt solution to dissolve heavy oxides and surface silicon while minimizing etching and intergranular attack of the aluminum substrate such, for example, as a porous cast aluminum substrate; (iii) immersed in a room temperature dilute zincate bath for applying a relatively thin zinc protective coating, preferably utilizing a double zincate immersion process with an intermediate prolonged (1-3 min.) nitric acid soak to reduce the zincate deposition rate and to thereby provide improved zincate adhesion; (iv) plated with a non-porous strike applied directly on the zincate protective coating--e.g., by electroplating or by electroless plating methods such, for example, as by immersion in a bath of nickle-hypophosphite material maintained at a temperature of approximately 190.degree. F.; and (v), immersed in a metal plating bath such, for example, as a tin plating bath--preferably, a low pH, room temperature acid tin bath--so as to apply a blister-free electrically conductive surface on the porous aluminum casting.

REFERENCES:
patent: 3180715 (1965-04-01), Simon
patent: 3281266 (1966-10-01), Colonel
patent: 3466156 (1969-09-01), Peters et al.
patent: 3738818 (1973-06-01), Stone et al.

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