Effect of electrical contact strengthening on microstructure and properties of Ni/Cu composite coatings

doi:10.13251/j.issn.0254-6051.2020.08.044

Abstract

Abstract: Ni/Cu composite coating with a thickness of 1 mm was prepared by brush plating on the surface of the cast iron, and the coating was subjected to electrical contact strengthening test. The effect of electrical contact strengthening on the microstructure and property of the coating was analyzed by means of field emission electron microscopy (FESEM) and Vickers hardness tester. The test results show that the electrical contact strengthening improves the surface and internal quality of the coating and reduces defects such as cracks in the coating. At the same time, electrical contact strengthening results in partial mosaic melting between the coating and the substrate. The electrical contact strengthening changes the microstructure of the Ni layer and the Cu layer, making the coating structure denser and tighter, and plastic deformation occurs between the Cu layer and Ni layer, resulting in a certain inlay. After strengthening, the surface and cross-section hardness of the coating are improved. The hardness of the hardened layer formed between the plating layer and the substrate is much greater than that of the substrate, and the electrical contact strengthening improves the bonding strength between the plating layer and the substrate.

Key words: brush plating, Ni/Cu composite coating, electrical contact strengthening, microstructure and properties

CLC Number:

TG174.4

Li Zhihong, Ding Hao, Zhu Shigen. Effect of electrical contact strengthening on microstructure and properties of Ni/Cu composite coatings[J]. Heat Treatment of Metals, 2020, 45(8): 228-232.

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