CLEANING COMPOSITIONS FOR METAL SUBSTRATES

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FIELD : chemistry. SUBSTANCE : compositions of the invention comprise an aqueous carrier, a hydroxide anion, a phosphate anion, an azole compound or corrosion inhibitor containing an azole compound and at least one of the group consisting of rare earth ions, alkaline earth metal ions, Li ion, K ion, Rb ion, Cs ion, Fr ion and/or ions of transition metals. At that, the first of the composition versions does not contain anions other than hydroxide and phosphate, and the second one does not contain additional components that have a significant effect on the corrosion resistance of a metal substrate. A composition comprising an aqueous carrier, a hydroxide anion, a phosphate anion, an azole compound, polyvinylpyrrolidone and allantoin, and a composition consisting of an aqueous carrier, a hydroxide anion in an amount of 0.05 to 25 g/1000 g of solution, phosphate anion and corrosion inhibitor, containing a Li ion are proposed as well. EFFECT : metal cleaning without etching slurry, effectively increasing adhesion to the subsequent coating layers. 21 cl