Acid inhibitor compositions for metal cleaning and/or pickling
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United States of America Patent
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Oct 2, 2012
Grant Date -
Feb 5, 2009
app pub date -
Aug 22, 2008
filing date -
Feb 1, 2007
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Abstract
An acid inhibitor concentrate is provided which contains water, at least one polyamino-aldehyde resin such as a quaternized polyethylenepolyamine-glyoxal resin, and at least one compound selected from the group consisting of acetylenic alcohols, ethoxylated fatty amines, ethoxylated fatty amine salts, and aldehyde-releasing compounds (such as hexamethylenetetramine). Such concentrates form useful metal cleaning and pickling solutions when combined with aqueous acid, wherein such solutions, when contacted with a metal surface, are effective in removing scale, smut and other deposits from the metal surface but exhibit a reduced tendency for the aqueous acid to attack or etch the metal itself.
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