Method for anodizing aluminum and product produced

Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Forming multiple superposed electrolytic coatings

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Details

205175, 205204, 205213, 205917, C25B 100

Patent

active

054862833

ABSTRACT:
An improved method of anodizing aluminum which produces an oxide surface receptive to the formation of strong and durable bonds with epoxy adhesives and coatings with underlying bulk properties providing dissimilar metal separation and basic corrosion protection. The invention provides a two step electrolytic process which includes, firstly, anodizing the aluminum with a phosphoric acid solution and then, secondly, further anodizing the aluminum with a sulfuric and boric acid solution. A product is provided that has a final coating having two anodized regions. The first outer region produced by the phosphoric acid solution is about 3000 angstroms thick and is characterized by open pores which is particularly well suited for the establishment of stable, strong and durable bonds with epoxy primers and adhesives. The second base region produced by the sulfuric/boric acid solution provides a thick, tough, corrosion resistant region about 15,000 angstroms thick.

REFERENCES:
patent: 4127451 (1978-11-01), Marceau et al.
patent: 4566952 (1986-01-01), Sprintschnik et al.
patent: 4894127 (1990-01-01), Wong et al.
patent: 5271804 (1993-12-01), Muller et al.

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