FIELD: chemistry.
SUBSTANCE: invention relates to a liquid for depositing zinc phosphate coating on a metallic material by chemical conversion treatment, which is an aqueous solution with pH 3.6-4.4, containing 500-4000 ppm phosphate ions and 300-12000 ppm zinc ions. For this solution, the coefficient K, calculated based on concentration of phosphate ions: P (ppm), concentration of zinc ions: Z (ppm) and pH: X according to the formula: K=10X×P2×Z3/1018, is in the range from 1 to 50.
EFFECT: invention enables to obtain thin-film zinc phosphate coatings on metallic materials, said coatings having excellent base coating characteristics, and enables to reduce the amount of deposits formed and reduces consumption of reactants.
3 cl, 3 dwg, 4 tbl
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