Process for treating aluminum cans
AssigneeOxy Metal Industries Corporation
InventorsYasunobu Matsushima, Hideo Oka, Katsuyoshi Noji, Hiroyoshi Nakagawa
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Abstract
Disclosed is a process for treating aluminum wherein the surface is contacted with a solution containing phosphate, a tannin, titanium and fluoride prior to inking or lacquering. The process produces a coating exhibiting adhesion, color and corrosion resistance comparable to that obtained via conventional chromium-based processes without creating the pollution problems of chromium disposal.
Claims13
In a process for treating aluminum to impart corrosion resistance and paint adhesion to the surface thereof, the improvement comprising treating the surface with an aqueous solution having an acidic pH and containing in dissolved form:
- a vegetable tannin:
- 0.0l - 10 g/l
- a titanium compound:
- 0.01 - 10 g/l as Ti
- a fluoride compound:
- 0.01 - 10 g/l as F
- a phosphate compound:
- 0.01 - 50 g/l as PO.sub. 4
A corrosion resisting aqueous acidic composition suitable for imparting improved corrosion resistance and paint adhesion to an aluminum surface which composition comprises in dissolved form;
- a vegetable tannin:
- 0.01 - 10 g/l
- a titanium compound:
- 0.01 - 10 g/l as Ti
- a fluoride compound:
- 0.01 - 10 g/l as F
- a phosphate compound:
- 0.01 - 50 g/l as PO.sub.4
An aqueous concentrate composition, suitable for treating an aluminum surface when diluted with water comprising in dissolved form a vegetable tannin, a titanium compound, a fluoride compound and a phosphate compound in a weight ratio of tannin:titanium:fluoride:phosphate of 1 :
- 0.001-1000 :
- 0.001-1000 :
- 0.001-5000.
Dependencies are inferred from the claim text.