Chromate-free etching process and composition for preparing alum

Details Chromate-free etching process and composition for preparing alum Chromate-free etching process and composition for preparing alum

1977-06-21

1978-07-11

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

252 792, C23F 100

Patent

active

041000153

ABSTRACT:
A chromate-free etching process and composition for treating aluminum parts o prepare a surface for durable adhesive bonding to other parts, which avoids the toxicity and disposal problems attending the use of conventional chromate containing etching baths. The process utilizes an etchant composition composed of an aqueous solution of nitric acid, alkali metal sulfate, ferric sulfate and preferably also sulfuric acid.

REFERENCES:
patent: 3009849 (1961-11-01), Bellinger
patent: 3510430 (1970-05-01), Mickelson et al.

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