Method for obtaining nano Cu-Sn-graphite composite coating and Cu-Sn-graphite electroplating solution

Abstract

The invention provides a method for obtaining a nano Cu-Sn-graphite composite coating and a Cu-Sn-graphite electroplating solution. The method comprises the following steps: adding a nano graphite sol prepared by an electrolytic process into a Cu-Sn plating solution to prepare a Cu-Sn-graphite electroplating solution, putting a metal component into the Cu-Sn-graphite electroplating solution, and carrying out electroplating under the following conditions to obtain the composite coating containing copper, tin, graphite and copper-tin crystallized product: the temperature is 35-45 DEG C, the stirring speed is 100-200 r / min, the pH value is 9-10, the current form is pulse current, the current density is 2-4 A / dm<2>, the duty ratio is 30-80%, and the frequency is 50-5000Hz. The method can perform plating on a complex curved surface, has the advantages of no pollution of the plating solution and the like, and can easily implement large-scale production. The coating obtained by the method has the advantages of excellent wearability, low friction factor, favorable corrosion resistance, favorable compactness, uniform and controllable thickness, no pinhole steam drum and the like.

Description

technical field [0001] The invention relates to a surface treatment method of metal materials, in particular to a new method for obtaining nanometer Cu-Sn-graphite composite coating. Background technique [0002] Graphite is widely used in composite materials, including Cu / graphite composite materials, Ni / graphite composite materials, Al / graphite composite materials, Ag / graphite composite materials, alloy and graphite composite materials, polymer and graphite composite materials, etc. . At present, the following methods are mainly used to prepare these composite materials at home and abroad: C / Cu composite materials are prepared by powder metallurgy, spray deposition, liquid phase impregnation, composite casting, mechanical alloying and internal oxidation; 2 Ni / graphite composite materials were prepared by reducing the oxidized graphite layer; Ni-P-graphite coating was prepared by electroless plating and composite electroplating, and the method was to add graphite powder to...

AI Technical Summary

Problems solved by technology

From the perspective of the material itself, the wettability of graphite and copper substrates is poor, and the solid and liquid phases are incompatible or undergo chemical reactions, so the interface bonding strength is low, and cracks are prone to occur at the junction to generate stress, which affects the composite. The main factor of material performance, and the traditional preparation method can not solve the interface bonding problem well

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