A rare earth-nickel-cobalt-tungsten disulfide multi-element alloy anti-corrosion and wear-resistant composite coating, electroplating solution and preparation method thereof

Abstract

The invention discloses a rare earth-nickel-cobalt-tungsten disulfide multi-element alloy anti-corrosion and wear-resisting composite plating layer and electroplating solution and a preparation method of the electroplating solution. The plating layer is of a particle structure with an intermetallic compound and nanometer tungsten disulfide dispersed on a nanocrystalline matrix. The plating-state microhardness of the plating layer ranges from HV 700 to HV 1,200. The plating layer is prepared from, by weight, 1%-55% of cobalt, 0.5%-12% of rare earth, 0.1%-5% of tungsten disulfide and the balance nickel. The electroplating solution is prepared from 260 g / L-400 g / L of nickel sulfate, 10 g / L-75 g / L of cobalt sulfate, 30 g / L-50 g / L of nickel chloride, 35 g / L-55 g / L of boric acid, 0.1 g / L-28 g / L of rare earth, 1 g / L-35 g / L of sodium borohydride, 2 g / L-20 g / L of triethylene tetramine, 5 g / L-40 g / L of citric acid, 5 g / L-20 g / L of malonic acid and 0.01 g / L-4.9 g / L of tungsten disulfide. The appearance of the plating layer is bright, smooth, free of cracks and compact, and meanwhile the plating layer is high in plating-state hardness, small in internal stress, high in thickness plating capacity and good in anti-corrosion and wear-resisting performance and has good comprehensive mechanical performance; meanwhile, the electroplating solution and the plating layer are simple in preparation method, and operation is easy; and adopted materials are friendly to environment, production efficiency is high, and energy saving and environment protection are achieved.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a rare earth-nickel-cobalt-tungsten disulfide multi-element alloy anti-corrosion and wear-resistant composite coating, an electroplating solution and a preparation method thereof. Background technique [0002] At present, with the increasing awareness of environmental protection in all countries in the world, the traditional hexavalent chromium electroplating process has serious environmental pollution and serious harm to the human body, as well as high energy consumption, low production efficiency, and difficult disposal of electroplating waste. Defects such as high cost are gradually being restricted or banned by more and more countries. The United States, the European Union and other countries have strictly prohibited the use of hexavalent chromium plating process. Some areas of our country have also formulated relevant regulations, such as Tianjin City, which...

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Problems solved by technology

[0004] One of the objectives of the present invention is to provide a rare earth-nickel-cobalt-tungsten disulfide multi-element alloy anti-corrosion and wear-resistant composite coating, electroplating solution and preparation method thereof, so as to solve the problem of low hardness and high internal stress of the coating obtained by the existing electroplating process. High brittleness, easy to produce cracks when plating thick, lose corrosion resistance, and some problems even cannot obtain thick plating

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