Preparation method of Ni-SiC compound coating on surface of aluminum alloy and electroplating solution thereof

Abstract

The invention discloses a preparation method of a Ni-SiC compound coating on the surface of an aluminum alloy. The preparation method adopts an anode type surfactant which is hexadecyl trimethyl ammonium bromide for replacing a cathode type surfactant which is lauryl sodium sulfate adopted by the invention at present. The preparation method is characterized by increasing the concentration of an anode activator NiCl2 while reducing current density and the concentration of silicon carbide in a plating solution, obtaining a fine and dense compound coating at an electroplating rate of 1-2 micron per minute, stirring by using air with volume flow being 4-7L/min and fully dispersing the silicon carbide, simultaneously adding CTAB to improve the wettability of the silicon carbide and obtain a fine and dense compound coating with high content of uniformly-dispersed silicon carbide. Through the preparation method of the Ni-SiC compound coating on the surface of the aluminum alloy, the technical problem of low tensile performance and low abrasion resistance of the aluminum alloy can be solved; the Ni-SiC compound coating with high adhesion strength, high content of uniformly-distributed hard silicon carbide particles, high hardness and high abrasion resistance can be prepared on the surface of the aluminum alloy.

Description

technical field [0001] The invention relates to the technical field of surface modification of metal materials, in particular to a method for preparing a Ni-SiC composite coating on the surface of an aluminum alloy. [0002] It is specially used for the preparation, production and application of Ni-SiC composite coating for tensile and wear resistance on the surface of aluminum alloy engine cylinder cavity. Background technique [0003] Chromium metal coating exhibits many superior properties, such as high corrosion resistance, high strength and hardness, low oxidation rate and good strength retention at high temperature, which solves the problem of engine cylinder anti-wear and tensile resistance, and improves the working performance of the engine. Reliability prolongs the service life of the engine, but the electroplating hard chrome process will cause serious environmental problems, so it is necessary to introduce the concept of cleaner production and find a new alterna...

AI Technical Summary

Problems solved by technology

[0015] In order to overcome the deficiencies in the prior art that the coating structure is coarse, the content of silicon carbide in the coating is low, and the distribution of silicon carbide is uneven, the present invention proposes a method for preparing a Ni-SiC composite coating on the surface of an aluminum alloy

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