| 摘要 |
An aqueous alkaline cleaner for aluminum has a pH in the range from 10.0-12. 0 and contains:: At from 0.5 to 10.0 g/L of an alkali builder component; B) from 0.5 to 10.0 g L of aminoalkyl- and or hydroxyalkyldiphosphonic acids and/or their water soluble salts: C) from 0.1 to 3.0 g/L of an aluminum ion sequestering agent component: and D) from 0.5 to 5.0 g/L of a surfact- ant component. Cleaning aluminum and aluminum alloy with such a cleaner generates an excellent surface condition with re- spect to de-smutting performance, water wettability avoidance of black smut production. blackening, and paint adherence at least as good as that achieved with conventional acid cleaner. without requiring any acid wash.
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