Alkaline cleaning compositions non-corrosive toward aluminum surfaces
AssigneeLever Brothers Company
InventorsFred K. Rubin, David Van Blarcom, Daniel J. Fox
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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.
Claims10
An aqueous alkaline cleaning composition for aluminum surfaces which avoids discoloring or tarnishing of the metal surface consisting essentially of a mixture of sodium carbonate and sodium metasilicate in the ratio of about 20:1 to about 1:2, respectively, wherein sodium metasilicate is present in an effective amount up to about 1% by weight of the composition and wherein the pH ranges from about 12.3 to about 12.7.
Dependencies are inferred from the claim text.