Acidic cleaner for metal surfaces

Details Acidic cleaner for metal surfaces Acidic cleaner for metal surfaces

C - Chemistry, Metallurgy

11

D

C11D 1/37 (2006.01) C11D 1/83 (2006.01) C11D 3/02 (2006.01) C11D 3/12 (2006.01) C11D 3/20 (2006.01) C11D 3/28 (2006.01) C11D 3/36 (2006.01) C23F 1/30 (2006.01) C23F 1/44 (2006.01) C11D 1/34 (2006.01)

Patent

CA 2651186

The invention relates to a acidic composition for cleaning surfaces of metal or alloys which are susceptible to corrosion comprising i) an ester of phosphoric acid, diphosphoric acid or polyphosphoric acid, ii) a benzotriazole derivative of the general formula (I) in which each of the groups R1, R2, R3, R4 and R5 is the same or different and is hydrogen atom, an alkyl group, an alkenyl group, or an acyl group, iii) a phosphonic acid of the general formula R6-PO-(OH)2 (II) in which the group R6 is alkyl group, alkenyl group, aryl group, or arylalkyl group and iv) an acidic source. The invention further relates to a use solution and to a method for cleaning.

L'invention concerne une composition acide de nettoyage de surfaces de métaux ou d'alliages sensibles à la corrosion, comprenant i) un ester d'acide phosphorique, d'acide diphosphorique ou d'acide polyphosphorique, ii) un dérivé de benzotriazole représenté par la formule générale (I) dans laquelle chacun des groupes R1, R2, R3, R4 et R5 est identique ou différent, et est un atome d'hydrogène, un groupe alkyle, un groupe alcényle ou un groupe acyle, iii) un acide phosphonique représenté par la formule générale R6-PO-(OH)2 (II) dans laquelle le groupe R6 est un groupe alkyle, un groupe alcényle, un groupe aryle ou un groupe arylalkyle, et (iv) une source acide. L'invention concerne également une solution et un procédé de nettoyage.

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