脉冲频率对纳米晶镍镀层结构及性能的影响

Effect of Pulse Frequency on the Microstructure and Properties of Nanocrystalline Nickel Coatings

采用脉冲电沉积方法在黄铜基体上制备纳米晶镍镀层。研究了脉冲频率对镀镍层的微观结构、硬度及耐蚀性的影响。结果表明:直流电沉积制备的镀镍层表现为(111)晶面和(200)晶面的双择优取向,而脉冲电沉积制备的镀镍层仅在(111)晶面表现出择优取向;脉冲电沉积制备的镀镍层的硬度和耐蚀性均高于直流电沉积制备的镀镍层的;不同脉冲频率下制备的镀镍层的硬度没有显著差别,约为5 500 MPa;但不同脉冲频率下制备的镀镍层的耐蚀性存在差别,脉冲频率为0.1kHz时制备的镀镍层在3.5%的NaCl溶液中的耐蚀性最好。

Nanocrystalline nickel coatings were electrodeposition. Effect of pulse frequency on prepared on the surface of brass by pulse the microstructure, hardness and corrosion resistance of nickel coatings was studied. Results showed that the nickel coating prepared by direct current electrodeposition exhibit double preferred orientation respectively at （111） crystal plane and （200） crystal plane, however the one prepared by pulse electrodeposition exhibit preferred orientation only at （111） crystal plane. The hardness and corrosion resistance of nickel coating prepared by pulse electrodeposition were higher than that of nickel coating prepared by direct current electrodeposition. The hardness of the nickel coating prepared with different pulse frequency has no significant difference, was about 5 500 MPa. However, there was difference in the corrosion resistance of nickel coating prepared with different pulse frequency, the nickel coating prepared when pulse frequency was 0.1 kHz present the best corrosion resistance in 3.5 NaCl solution.