Chemical conversion method and aqueous chemical conversion solut

Details Chemical conversion method and aqueous chemical conversion solut Chemical conversion method and aqueous chemical conversion solut

1993-04-02

1994-09-20

Niebling, John

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Forming nonmetal coating

205106, 205213, 205201, C25D 908

Patent

active

053486404

ABSTRACT:
The method for forming a chemical conversion film on a substrate made of aluminum or its alloy which comprises the steps of: (a) etching a surface of the substrate with an aqueous solution of acid or alkali; (b) immersing the etched substrate in an aqueous, phosphate-based chemical conversion solution which is substantially free from fluoride ions; and (c) applying a negative voltage to the substrate during at least a part of the immersion step so that a potential of the substrate reaches a predetermined minimum potential which is lower than a natural electrode potential of the substrate in the aqueous chemical conversion solution.

REFERENCES:
Cleaning and Etching Aluminum, Metal Finishing, Spring, S., pp. 66-71 (Aug. 1968).

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