Rare earth metal salt passivating solution and method for passivating surface coating of galvanized steel wire

Abstract

The invention discloses a rare earth metal salt passivating solution, wherein the concentration of cerous nitrate is 1-10g / L, the concentration of cerium chloride is 1-10g / L, the concentration of lanthanum nitrate is 1-10g / L, the concentration of magnesium nitrate is 1-10g / L, the concentration of boric acid is 1-10g / L, the concentration of 35% of hydrogen peroxide is 2-20ml / L, the concentration of nitric acid is 1-4g / L, the current density concentration is 10-100mA / cm<2>, and the pH value is 1-7. The invention also discloses a method for passivating surface coating of a galvanized steel wire, which comprises the following steps: pre-treating the galvanized steel wire, removing oil at intermediate oil, activating the surface, painting a roller to forming a membrane and solidifying. The rare earth metal ion in the passivating solution mitigates the stress of surface treatment coating film layer, and improves the surface crack of the galvanized steel wire, the passivating solution has the advantages of no toxicity, environmental protection, health and safety, and the passivation treatment process is capable of effectively improving the corrosion resistant performance of a galvanizing layer and increasing the usage life of the galvanizing layer.

Description

technical field [0001] The invention relates to a material surface anticorrosion process, in particular to a passivation solution and a material surface passivation method, which are applied in the technical field of material surface anticorrosion treatment. Background technique [0002] Steel wire surface galvanizing technology is a technology that draws high-quality carbon structural steel, and then forms zinc-coated steel wire by electro-galvanizing or hot-dip galvanizing. Zinc hardly changes in dry air, but will form a thin film in an environment containing oxygen and carbon dioxide, making it have good corrosion resistance. Based on this performance, zinc coating is widely used in coating the surface of steel products. At present, electrogalvanizing is mostly used in China to obtain zinc coating, and it is gradually applied to the surface of ultra-high-strength steel wire used in bridge construction. Because the zinc coating is relatively active, passivation treatment...

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Problems solved by technology

[0005] In order to solve the problems of the prior art, the object of the present invention is to overcome the deficiencies in the prior art, provide a rare earth metal salt passivation solution and a method for passivating the surface coating of galvanized steel wire, the treatment process is simple, and the rare earth in the passivation solution The metal ions ease the stress of the surface treatment film layer, thereby improving the crack and peeling of the surface of the galvanized steel wire. To a certain extent, it can replace the traditional chromate passivation, and use a non-toxic and environmentally friendly passivation agent to improve the ultra-high strength. Corrosion resistance of galvanized steel wire, a complete passivation film is obtained on the surface of galvanized steel wire, and chromium-free passivation on galvanized steel wire can not only ensure the appearance and color requirements of the steel wire, but also effectively improve the corrosion resistance of the galvanized layer and improve the corrosion resistance of the galvanized steel wire. The service life of the zinc layer is very important, and it is of great significance to improve the current situation of polluting the environment and endangering human health, which is in line with the development direction of clean production

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