Claims
- 1. A non-chromium aluminum coating composition to provide a protective conversion coating for aluminum or aluminum alloys which have not been treated with chromium comprising as the essential ingredients thereof an alkali metal permanganate and an aluminum nitrate wherein the composition is an aqueous composition having a pH of about 2.5 to about 4.0, and there is at least 760 ppm permanganate and there is about 0.10 to about 10.0% aluminum nitrate.
- 2. The composition of claim 1 wherein the permanganate is potassium permanganate.
- 3. The composition of claim 1 wherein there is at least 1.5 gms of alkali metal permanganate per liter, the nitrate is Al(NO.sub.3).sub.3.9H.sub.2 O and the nitrate concentration is about 0.5% to about 2.0%.
- 4. The composition of claim 3 wherein the permanganate is potassium permanganate.
Parent Case Info
This is a continuation in part of my Ser. No. 050,841, filed Apr. 21, 1993, now U.S. Pat. No. 5,358,623, and application Ser. No. 08/322,238, filed Oct. 13, 1994 now U.S. Pat. No. 5,437,740.
The present invention relates to a method of treating anodized aluminum and aluminum alloys coated with a non-chromium corrosion resistant coating and to the articles produced thereby.
US Referenced Citations (3)
Related Publications (1)
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Date |
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322238 |
Oct 1994 |
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Continuation in Parts (1)
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50841 |
Apr 1993 |
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