Method for preparing anticorrosion zinc nickel alloy coating

Abstract

The invention relates to a method for preparing an anticorrosion zinc nickel alloy coating with high nickel content, and belongs to the technical fields of ocean corrosion prevention and surface treatment. The method comprises the following steps of: mixing zinc powder and nickel powder in a weight ratio into raw material powder, adding a bonding agent and a dispersing agent into the raw material powder, mixing, adding deionized water, stirring to form slurry, and standing for 12 hours; grinding the slurry to form grinding slurry powder which is in the dispersed suspension state; granulating the grinding slurry by using the conventional granulating equipment to obtain granular agglomerated powder; and keeping temperature and drying in a drying box, and sieving the granular agglomerated powder as spraying raw materials. According to the method, the anticorrosion zinc nickel alloy coating is prepared by an oxyacetylene torch spraying process, and a preparation process is simple, reliable in principle and easy to operate and control; and the coating is high in anticorrosion strength and long in service life.

Description

Technical field: [0001] The invention relates to a preparation method of a zinc-nickel alloy coating with high nickel content. The coating is suitable for long-term protection of steel components in marine environments and belongs to the technical field of marine anticorrosion and surface treatment. Background technique: [0002] Zinc-nickel alloy has excellent characteristics such as extremely high corrosion resistance, low hydrogen embrittlement, weldability and machinability, and is especially suitable for the surface protection of high-strength steel parts. Generally, zinc-nickel alloy coatings are prepared by electrodeposition technology ;As early as 1947, Schantz proposed that adding a certain component of nickel salt to the acidic galvanizing solution can obtain an alloy coating with a nickel content of 15%, and its corrosion resistance is better than that of zinc coating, and obtained a US patent; After the 1970s, in order to improve the corrosion resistance of steel...

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Problems solved by technology

[0004] Although many scholars at home and abroad have accumulated a lot of scientific research results on the electroplating zinc-nickel alloy work so far, as an electroplating process, it also has its own defects: first, the coating should not be too thick, generally around a dozen microns; The second is that the plating solution causes great pollution to the environment; compared with the electroplating zinc-nickel alloy process, the preparation of zinc-nickel alloy coating by thermal spraying has the advantages of simple process, material saving and little environmental pollution, and can improve the coating Thickness for long-term protection

Quan Hongye from Luoyang Ship Materials Research Institute prepared a zinc-nickel alloy coating with a nickel content of up to 7% by two thermal spraying processes, arc wire spraying and flame wire spraying, and pointed out that the corrosion resistance of zinc-nickel alloy is better than that of Pure zinc, and with the increase of nickel content, the corrosion resistance is improved; but when trying to further increase the nickel content of the coating, with the increase of nickel content, the brittleness of the alloy increases, and high nickel content cannot be prepared by hot extrusion and cold drawing processes content of the alloy wire, can not increase the nickel content of the alloy; B.Arsenault et al. used supersaturated low-pressure argon protection smelting method to prepare zinc-nickel alloy powder with a nickel content of 30%, and achieved good corrosion resistance, but this method can High consumption, not suitable for large-scale industrial production

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