COMPOSITION FOR REMOVING SCALE FROM SURFACE OF NON- FERROUS METALS OR ALLOYS THEREOF Russian patent published in 1997 - IPC

FIELD: preparation of high quality surfaces. SUBSTANCE: scale is chemically removed form surface of non-ferrous metals without detrimental environment effect. Composition for removing scale from surface of non-ferrous metals or alloys thereof comprises (wt %): 0.1-80 sulfuric acid; 0.05-25 maleic anhydride; 0.5-60 sulfomaleic anhydride or sulfomaleic acid monoester based on C₄-C₁₀ aliphatic alcohols; and the water balance. Composition completely removes black dense scale, reduces concentration of metals in sewage, increases efficiency of etching machines, improves quality of coatings applied onto copper, brass, zinc, sodium, aluminium or other non- ferrous metals and improves ecological situation in work shops. EFFECT: improved properties of the composition.