Effect of Heat Treatment on Microstructure and Performance of Nano-WC Particle-Strengthened Ni Composite Coatings by Ele
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JMEPEG https://doi.org/10.1007/s11665-020-05282-y
Effect of Heat Treatment on Microstructure and Performance of Nano-WC Particle-Strengthened Ni Composite Coatings by Electrobrush Plating Xiaoben Qi, Cong Wang, Rulin Zhang, and Meijie Han Submitted: 14 January 2020 / Revised: 23 September 2020 / Accepted: 25 October 2020 Electrobrush plating technology has been widely used in surface remanufacturing and reinforcement and could be used to repair and reconstruct waste machinery and other products. In this paper, the effect of heat treatment on microstructure, wear resistance and thermal shock resistance of nano-WC particlestrengthened Ni composite electrobrush plating coatings was investigated using phase analysis, morphological observation, microhardness testing and coating lifetime evaluation. After heat treatment at 550°C, the cauliflower structure became more compact and the interface between coating and substrate was strengthened due to element diffusion, which led to an increase in the microhardness and coating lifetime. As the heating temperature increased, the microstructure of the coatings and substrate grew abnormally, which resulted in degradation of the coating properties. The extension of the thermal shock lifetime of the coatings after heat treatment contributed to microstructure improvement, element diffusion and new phase formation, which prolonged the times for crack initiation and propagation. Keywords
electrobrush plating, heat treatment, microstructure, thermal shock resistance, wear resistance
1. Introduction The electrobrush plating technique plays an important role in surface engineering and equipment remanufacturing and has been widely applied to equipment surface reinforcement and repair (Ref 1, 2). Nanoparticle (e.g., metal, ceramic and composite particles) composite coatings prepared by electrobrush plating have many advantages, including high hardness, and excellent abrasion resistance and have attracted a substantial amount of attention for industrial applications. Xu Binshi et al. (Ref 3, 4) studied the effect of nano-Al2O3 particles on the structure and performance of Ni-Co composite coatings, and the results indicated that the hardness increased by approximately 38% compared with that of Ni-Co composite coatings. In addition to improving the mechanical properties, composite Ni/Al2O3 electrobrush plating coatings showed excellent corrosion resistance (Ref 5). The addition of ZrO2 could also enhance the contact fatigue behavior of Ni electrobrush plating coatings (Ref 6). The friction coefficient of nano-Al/Cu composite coatings was lower than that of pure-Cu coatings (Ref 7), and Guo Jin (Ref 8) revealed the effect of neodymium content on the mechanical properties of brush plating coatings.
Xiaoben Qi and Rulin Zhang, School of Materials, Shanghai Dianji University, Room509, Mechanical Engineering Building, 1350 Ganlan Road, Pudong District, Shanghai 201306, China; and Cong Wang, School of Mechanical Engineering, Shanghai Dianji University, Shanghai 201306, China; and Meijie Han, Schoo
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