直流、单向脉冲和换向脉冲法制备镍-钴-碳化钨复合镀层的比较(英文)  

Comparison of Ni-Co-WC composite coatings prepared by direct, pulse and pulse reverse current methods

作　　者：Ranjith Bose G.Paruthimal Kalaignan K.N.Srinivasan 

机构地区：[1]R & D Department, Reem Batteries & Power Appliances Co SAOC, Sultanate of Oman [2]Advanced Nano-Composite Coatings Laboratory, Department of Industrial Chemistry, Alagappa University, Karaikudi-630 003, Tamilnadu, India [3]Central Electrochemical Research Institute, Karaikudi-630 006, Tamilnadu, India

出　　处：《电镀与涂饰》2013年第3期9-13,共5页Electroplating & Finishing

摘　　要：在醋酸盐镀液体系中采用直流(DC)、单向脉冲电流(PC)和换向脉冲电流(PRC)3种方法制备了Ni-Co-WC复合镀层。采用扫描电镜及电化学阻抗谱(EIS)表征了镀层的微观组织及耐蚀性。结果表明,镀层的微观结构及性能受镀层中WC含量的影响很大。在最佳WC含量的情况下,镀层的显微硬度及耐蚀性都明显提高。与PC和DC法制备的复合镀层相比,PRC法制备的复合镀层具有更致密的表面,更高的显微硬度以及更好的耐蚀性。Ni-Co-WC composite coatings were prepared by direct current （DC）, pulse current （PC） and pulse reverse current （PRC） methods using an acetate bath. The microstructure and corrosion resistance of the coatings were characterized by SEM and electrochemical impedance spectroscopy （EIS）. The results showed that the microstructure and performances of the coatings were greatly affected by WC content in the deposits. The microhardness and corrosion resistance were enhanced in the optimal percentage of WC in composite coatings. The PRC composite coatings exhibit more compact surfaces, higher microhardness and better corrosion resistance as compared with the PC and DC composite coatings.

关 键 词：镍-钴合金 碳化钨 复合镀层 显微硬度 电化学 表面形貌 

分 类 号：TQ153.2[化学工程—电化学工业]