Aluminum treatment with alkaline solution and tannin

Details Aluminum treatment with alkaline solution and tannin Aluminum treatment with alkaline solution and tannin

1978-03-30

1979-08-07

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 615R, C23F 700, C23F 706

Patent

active

041636791

ABSTRACT:
A chromium-free treatment for aluminum imparts corrosion resistance and paint receptivity to the surface. The process is sequential and includes a first contact with an aqueous alkaline solution (pH above 10) containing complexed iron ion, water rinsing, and then contact with an aqueous acidic organic tannin-containing composition.

REFERENCES:
patent: 3975214 (1976-08-01), Kulick et al.
patent: 4017334 (1977-04-01), Matsushima et al.
patent: 4054466 (1977-10-01), King et al.
patent: 4063969 (1977-12-01), Howell

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