CORROSION-INHIBITING CLEANING SYSTEMS FOR ALUMINUM SURFACES, PARTICULARLY ALUMINUM AIRCRAFT SURFACES

摘要

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 1,000 and an aqueous solution of sodium silicate, the sodium silicate having an SiO2:Na2O 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 1,000 ppm, the pH of the solution ranging from about 8.1 to about 8.3.