FIELD: chemistry.
SUBSTANCE: group of inventions relates to a water-based alkaline cleaning agent concentrate for the production of a cleaning agent for metal surfaces, to a water-based alkaline cleaning agent for metal surfaces and a method for anticorrosion treatment of a metal surface, comprising contacting the surface with at least said water-based alkaline cleaning agent. Alkaline detergent concentrate contains at least one homopolymer of (meth) acrylic acid with a weight-average molar mass in range from 3,000 to 19,000 g/mol and at least one copolymer of (meth) acrylic acid with a weight-average molar weight in range from 50,000 to 100,000 g/mol. Copolymer of (meth) acrylic acid includes at least one linear copolymer of (meth) acrylic acid and at least one monomer containing a vinyl group and at least two acid groups selected from the group consisting of carboxylic acid groups and sulphonic acid groups.
EFFECT: said concentrate and cleaning agent are used without phosphates and provide reduced erosion during etching.
14 cl, 8 tbl
