Use of bicarbonates and carbonates in metal cleaning formulations to inhibit flash rusting
AssigneeChurch & Dwight Co., Inc.
InventorsSteven Dunn, Steven A. Bolkan, Francis Cala, Anthony Winston
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Abstract
Prevention of flash rusting of iron-containing substrates is achieved by contacting the substrates with aqueous solutions containing carbonate and/or bicarbonate salts. The treatment process can be effected during cleaning of the substrates with an aqueous alkaline cleaner or during a post cleaning step such as during rinsing of the substrates subsequent to cleaning.
Claims13
A method of treating iron containing substrates so as to simultaneously clean and prevent the formation of flash rust thereof comprising contacting contaminated surfaces of said substrates with an aqueous solution consisting essentially of carbonate salts in amounts of from about 0.01 to 10 wt % of said aqueous solution, bicarbonate salts in amounts of from about 0.1 to 10 wt % of said aqueous solution, at least one surfactant and an alkali metal salt of an intermediate chain length linear monocarboxylic fatty acid having carbons C.sub.7 -C.sub.13, said contacting taking place for a sufficient time to remove contaminants from the surfaces of said substrates, wherein said aqueous solution has a pH range of from at least 8 to about 11.0.
Dependencies are inferred from the claim text.