Acid inhibitor compositions for metal cleaning and/or pickling

Details Acid inhibitor compositions for metal cleaning and/or pickling Acid inhibitor compositions for metal cleaning and/or pickling

C - Chemistry, Metallurgy

08

L

C08L 61/32 (2006.01) C08L 61/00 (2006.01)

Patent

CA 2642715

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 hexamethylenetetrarnine). 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.

L'invention concerne un concentré d'inhibiteur acide contenant de l'eau, au moins une résine polyamino-aldéhyde telle qu'une résine polyéthylènepolyamine-glyoxal quaternisée et au moins un composé choisi dans le groupe comprenant les alcools acétyléniques, les amines grasses éthoxylées, les sels d'amines grasses éthoxylées et les composés libérant des aldéhydes (tels que l'hexaméthylènetétramine). De tels concentrés forment des solutions utiles pour le nettoyage et le décapage de métaux par mélange avec un acide aqueux, de telles solutions étant efficaces, lors de leur mise en contact avec une surface métallique, pour l'élimination du tartre, des saletés et autres dépôts de la surface métallique, tandis que la tendance de l'acide aqueux à attaquer ou à décaper le métal lui-même est réduite.

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