초록 ▼

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,

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 andiv) an acidic source. The invention further relates to a use solution and to a method for cleaning.

대표청구항 ▼

1. 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 R1, R2, R3, R4 and R5 is the same or different and is a hydrogen a

1. 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 R1, R2, R3, R4 and R5 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 R6—PO—(OH)2 in which the group R6 is alkyl group, alkenyl group, aryl group, or arylalkyl group; andiv) an acidic source, wherein the composition does not contain metal organic substances and the composition has a pH lower than 3. 2. The composition of claim 1, wherein the aqueous liquid composition comprises based on the total composition i) 0.1-10 wt-% of the ester of phosphoric acid, diphosphoric acid or polyphosphoric acid,ii) 0.01-2 wt-% of the benzotriazole derivativeiii) 0.01-2 wt-% of the phosphonic acid, andiv) 10-70 wt-% of the acidic source. 3. The composition of claim 1, wherein the ester is a monoester or diester of phosphoric acid. 4. The composition of claim 1, wherein the ester is a monoalkyl ester or dialkyl ester of phosphoric acid. 5. The composition of claim 1, wherein the ester is a mono-C4-C15 alkyl ester or di-C4-C15 alkyl ester of phosphoric acid. 6. The composition of claim 1, wherein each of the groups R1, R2, R3, R4 and R5 in the benzotriazole independently selected from hydrogen atom or a C1-C4 alkyl group. 7. The composition of claim 1, wherein R6 is a C5-C12 alkyl group. 8. The composition of claim 1, further comprising a calcium compound. 9. The composition of claim 8, wherein the calcium compound is selected from the group consisting of calcium chloride, calcium bromide, calcium acetate, calcium hydroxide, calcium oxide and mixtures thereof. 10. The composition of claim 1, further comprising a magnesium compound. 11. The composition of claim 10, wherein the magnesium compound is selected from the group consisting of magnesium chloride, magnesium bromide, magnesium acetate, magnesium sulfate, magnesium hydroxide, magnesium oxide and mixtures thereof. 12. The composition of claim 1, wherein the acidic source is an organic acid, inorganic acid, or mixture thereof. 13. The composition of claim 1, wherein the composition does not contain quaternary ammonium compounds. 14. The composition of claim 1, wherein the composition does not contain sulfur organic substances. 15. A method of cleaning a metal surface comprising: (a) applying to the surface, a composition 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 R1, R2, R3, R4 and R5 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 R6—PO —(OH)2 in which the group R6 is alkyl group, alkenyl group, aryl group, or arylalkyl group; andiv) an acidic source;(b) cleaning the surface; and(c) removing the composition from the surface by rinsing or drying, wherein the composition does not contain metal organic substances and the composition has a pH lower than 3. 16. The method of claim 15, wherein the surface is selected from the group consisting of zinc galvanized steel, aluminum, brass, stainless steel, and copper. 17. The method of claim 15, wherein the cleaning is a clean-in-place operation.