Plating auxiliary for steel

Abstract

The invention discloses a plating auxiliary for steel. The plating auxiliary for the steep is characterized by comprising, by weight, 5-10% of zinc chloride, 15-30% of ammonium chloride, 0.1-2% of sodium fluoride, 0.05-0.2% of fluoride surfactant, 0.1-1% of stannous oxide, 0.5-2% of rare earth chloride, and the balance water; the rare earth chloride comprises at least one of lanthanum chloride, cerium chloride, lanthanum-cerium chloride and zirconium oxychloride; the plating auxiliary can improve the surface quality of a plating of a plating part while reducing the release amount of hydrogen chloride and ammonia gas, so that the zinc plating layer is uniform in thickness and high in smoothness, and zinc materials are saved.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, in particular to a plating flux for steel. Background technique [0002] At present, all countries in the world use the solvent method for batch hot-dip galvanizing. To obtain a better hot-dip galvanized layer, the pre-treatment of the workpiece is very important. Different from other steel surface coating technologies, before hot-dip galvanizing, steel parts need a solvent-assisted plating treatment in addition to alkaline cleaning to remove oil and pickling to remove rust. As an important process in the pretreatment of hot-dip galvanizing, fluxing not only directly affects the quality of the coating, but also has a greater impact on the cost of zinc consumption. The commonly used fluxing solution is a mixed solution of zinc chloride and ammonium chloride. Zinc chloride is mainly used to prevent the surface of iron parts from being oxidized again during hot-dip plating, and at ...

AI Technical Summary

Problems solved by technology

[0003] However, the galvanized layer on the galvanized surface of the galvanized parts treated with the existing zinc ammonium chloride flux is often uneven in thickness, the finish is not high, and the galvanized parts have missing plating, so the overall quality of galvanized is not high.