| 摘要 |
Compositions useful particularly for cleaning (desmutting) an aluminum surface is described. The compositions are free of nitric acid and chromic acid, and comprise, in one embodiment, an oxidant and at least one mineral acid salt. In another embodiment, the composition is free of nitric acid and chromic acid, and the composition comprises an oxidant, at least one mineral acid salt, and a complexing agent which is a salt of an organic acid. Aqueous compositions free of nitric acid and chromic acid also are described. Due at least in part to the absence of nitric and chromic acids, and in particular, strong mineral acids, the cleaning compositions of the present invention remove smut residues from aluminum surfaces without significant etching of the aluminum.
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