| 摘要 |
Disclosed is an 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) wherein 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 and 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. Also disclosed is an aqueous use composition comprising said acidic composition and a method of cleaning surfaces comprising said composition.
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