Cleanser for anodized surfaces of aluminum and alloys thereof

Details Cleanser for anodized surfaces of aluminum and alloys thereof Cleanser for anodized surfaces of aluminum and alloys thereof

B - Operations, Transporting

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B

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B08B 3/10 (2006.01) B08B 3/08 (2006.01) B41C 3/00 (2006.01) B44C 3/00 (2006.01) C03C 15/00 (2006.01) C11D 7/08 (2006.01) C23F 1/00 (2006.01) C23G 1/00 (2006.01) C25D 11/18 (2006.01)

Patent

CA 1177372

K-6375 WHD:elg ABSTRACT OF THE DISCLOSURE This invention relates to an improved process for cleaning an anodized surface of aluminum or an alloy thereof where a cleaning agent is applied to the anodized surface and then the cleaning agent is removed after a sufficient period of contact, wherein the improvement comprises applying to the anodized surface at ambient temperature a thin film of a cleaning composi- tion comprising an acid solution consisting essentially of: (a) from about 3 to 30. percent by weight, based upon the total weight of the acid solution, of nitric acid, calculated as a 65% aqueous solution; (b) from about 0.1 to 20 percent by weight, based upon the-total weight of the acid solution, of partial esters of phosphoric acid; (c) from about 0.3 to 30 percent by weight, based upon the total weight of the acid solution, of a phos- phonocarboxylic acid with complexing action; (d) from about 0.5 to 30 percent by weight, based upon the total weight of the acid solution, of nonionic and/or anionic tensides; (e) from 0 to about 30 percent by weight, based upon the total weight of the acid solution, of solubili- zers and/or organic solvents; and (f) from about 40 to 90 percent by weight, based upon the total weight of the acid solution, of water, said solution having a pH of less than 2, and then rinsing off the cleaning composition with water.

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