Alkaline cleaning compositions non-corrosive toward aluminum sur

Cleaning and liquid contact with solids – Processes – For metallic – siliceous – or calcareous basework – including...

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134 29, 134 40, 252135, 252139, 252140, C23G 122

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active

044573227

ABSTRACT:
An alkaline composition and method of cleaning aluminum surfaces is disclosed which avoids discoloring or tarnishing of the metal surface. The composition comprises a mixture of alkali metal metasilicate and a compound chosen from the group consisting of sodium carbonate, potassium carbonate, lithium carbonate, potassium orthophosphate and sodium orthophosphate and mixtures thereof, wherein the metasilicate salt is present in an effective amount up to about 3% by weight of the composition and wherein the pH ranges above about 12.0.

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patent: 4093566 (1978-06-01), MacNamara et al.
patent: 4116849 (1978-09-01), Leikhim
patent: 4116851 (1978-09-01), Rupe et al.

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