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Electrodeposited copper-based electrical contact with the contact process and properties of the composite coating

Author: LiGuangYu
Tutor: ZhangXiaoYan
School: Guizhou University
Course: Materials Processing Engineering
Keywords: Composite electrodeposition Composite coating Electrical contact materials Contact resistance Arc Erosion Crafts
CLC: TQ153.14
Type: Master's thesis
Year: 2009
Downloads: 62
Quote: 0
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Abstract


In this paper, the the composite electrodeposition method , in pure copper surface preparation of copper-based composite coating it to meet the electrical contact material the use of performance . Particle mass concentration of the plating solution , the cathode current density , mixing strength and bath temperature of process parameters on the amount of co-deposition composite coating particles , determined by orthogonal test based on the best technology of the preparation of composite coatings parameters. And use of the various means of testing the composite coating surface morphology, microhardness , bond strength , oxidation resistance , electrochemical erosion resistance and electrical contact performance analysis ; Finally, explore the mechanism of the composite electrodeposition . The composite electrodeposition process research results show that : in the process to form a composite coating , plating bath particle mass concentration and cathode current density particle content in composite coatings significantly stirring intensity and the bath temperature impact followed . And the amount of the particles in the co-deposition in the plating as indicators to determine the optimal process for the composite electrodeposition : a bath particulate mass concentration of 35g / L, the cathode current density dm to 2, stirring intensity 600r/min bath temperature 50 ℃. Studies have shown that the composite coatings : composite coating than convex surface than pure copper plating , cellular finer particles , dense, and the deposition of particles in the composite coating evenly distributed , no reunion ; composite coating significantly improves the hardness of the matrix has moderate microhardness , and for electrical contact materials , the range of 98.5 to 115HV ; measured under the conditions of 1 × 10 ~ 4 times of the voltage of 12V, the current 5,10,15,20,25 A, the number of contacts touch point the amount of the transfer of the material , the composite coating in current ≤ 20A under the conditions of material from the cathode to the anode transfer , current gt ; 20A under the conditions of the transfer of material from the anode to the cathode . The contact resistance between 10 ~ 40mΩ fluctuations. And arc erosion of the surface morphology of the composite coating presented bumps , pits and stomatal morphology ; antioxidant properties, electrochemical corrosion test : composite coatings significantly improved the oxidation resistance of pure copper plating , electrochemical corrosion. Studies have shown that the composite electrodeposition mechanism : the the composite electrodeposition process to meet Guglielmi two-step adsorption model .

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CLC: > Industrial Technology > Chemical Industry > Electrochemical industries > Electroplating industry > A single metal plating > Copper
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