FIELD: metal processing.
SUBSTANCE: methods for passivating the surface of protective metal coatings used to increase the corrosion resistance of hot-dip galvanized steel in the automotive, shipbuilding, agricultural, petrochemical, etc. Composition for chromate-free passivation of hot-dip galvanized steel surfaces contains: 5.5-7.0 g/l hexahydrate cerous nitrate, 2.3-4.0 g/l hexahydrate lanthanum nitrate, 1.0-1.5 g/l boric acid, 0.02-0.03 g/l potassium pyrophosphate, 5-10 ml/l hydrogen peroxide and 1.5-2.5 g/l pentahydrate manganese sulfate.
EFFECT: introduction of manganese ions into the solution of the composition provides an increase in the protective ability of the resulting coatings on hot-dip galvanized steel while reducing their porosity and maintaining the service life of the composition solution.
15 ex
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