STUDY ON HIGH-SPEED ELECTRODEPOSITION OF Ni-SiC COMPOSITE COATING IN CENTRIFUGAL FIELD
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摘要: 利用自制的离心高速电沉积实验装置,研究了镀液温度、镀液pH值、电流密度、镀液中SiC浓度和阴极旋转速度对Ni-SiC复合镀层中SiC含量的影响;同时还对镀层中SiC微粒的分布情况及镀层的性能进行了研究。结果表明:温度、电流密度、镀液中的SiC含量及阴极旋转速度对镀层中复合粒子的含量有显著的影响,而pH值对镀层中SiC含量影响不大。利用离心高速电沉积方法能够制备出高体积分数的、微粒分布均匀的Ni-SiC复合镀层。所制备的高体积分数的Ni-SiC复合镀层硬度和耐磨性能优于普通槽镀镀层。Abstract: Utilizing self-made centrifugal high-speed electroplating equipment, the effects of technological parameters, such as temperature, pH value, current density, SiC content in electrolyte, and rotation speed of cathode, on SiC content in SiC/Ni composite coating are studied. The distribution of SiC particles in composite coating and the coating performance are also investigated. Experimental results show that temperature, current density, SiC content in electrolyte, and cathode rotation speed influence SiC codeposition volume obviously, while the pH value has little influence on SiC codeposition volume. SiC/Ni composite coating with well-distribution and high SiC codeposition volume can be prepared utilizing the centrifugal high-speed electeoplating equipment. The high codeposition amount of composite coating provides high hardness and wearability.
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