Patent ID: 8921298

Claim:
An acidic composition for cleaning surfaces of metal or alloys comprising: i) an ester of phosphoric acid, diphosphoric acid or polyphosphoric acid, ii) a benzotriazole derivative of the general formula: in which each of the groups R 1 , R 2 , R 3 , R 4 and R 5 is the same or different and is a hydrogen atom, an alkyl group, an alkenyl group, or an acyl group; iii) a phosphonic acid of the general formula R 6 —PO—(OH) 2 in which the group R 6 is alkyl group, alkenyl group, aryl group, or arylalkyl group; and iv) an acidic source, wherein the composition does not contain metal organic substances and the composition has a pH lower than 3.