METHOD FOR GALVANIZED STEEL SHEET PRODUCTION Russian patent published in 2017 - IPC C23C22/07 C23C22/83 C23C28/00 

FIELD: metallurgy.

SUBSTANCE: method includes stage of an oxide layer formation, which consists in bringing the galvanized steel sheet into contact with an acid solution for 1 to 60 seconds, and in subsequent washing of galvanized steel sheet with water, and stage of neutralisation treatment, which consists in bringing of the surface of the oxide layer formed in the stage of oxide layer formation in contact with an aqueous alkaline solution for 0.5 seconds or more, in washing the surface of the oxide layer with water and drying the surface of the oxide layer, at that the aqueous alkaline solution contains 0.01 g/l or more of P ions and 0.01 g/l or more of colloidal-dispersed particles. The aqueous alkaline solution preferably contains at least one phosphorus compound selected from phosphates, pyrophosphates and triphosphates, and at least one type of colloidal-dispersed particles, selected from Ti, silicon dioxide, Pt, Pd, Zr, Ag, Cu, Au and Mg.

EFFECT: invention enables production of sheet having good degreasing property, low resistance to sliding during pressing under stressed conditions of alkaline degreasing treatment.

37 cl, 3 dwg, 6 tbl