Allied Chemical Corporation

Church Dwight & Co., Inc.

Jack H Van Sciver

Lawrence Kirschner

Merwyn E Howells

William C Knoll

An alkaline blast cleaning system for aluminum surfaces which avoids discoloring or tarnishing of the aluminum surfaces, is comprised of an alkali metal bicarbonate having a particle size of from about 50 to about 1000 and an aqueous solution of sodium silicate, the sodium silicate having an SiO.sub.2 :Na.sub.2 O ratio of from about 2.44 to about 3.22:1 and being present in the aqueous solution in a corrosion inhibiting concentration of from about 100 to about 1000 ppm., the pH of the solution ranging from about 8.1 to about 8.3.

Corrosion-inhibiting cleaning systems for aluminum surfaces,

Addition of small amounts of nitric acid to aqueous sulfuric acid containing more than about 60% by weight of H.sub.2 SO.sub.4 inhibits corrosive attack on carbon steel with which it may come in contact.

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Madison, NJ, United States of America

Jack H Van Sciver