(1. 北京科技大学 新金属材料国家重点实验室，北京 100083；
2. 中国科学院 国际材料物理中心，沈阳 110016；
3. 中国工程物理研究院 表面物理与化学国家重点实验室，绵阳 621900)
摘 要: 采用高频脉冲电沉积制备纳米Ni镀层，研究高频脉冲频率对纳米Ni镀层组织、腐蚀性能和摩擦性能的影响；室温下，在含50 μg/g Cl−的氯化钾溶液中通过测试Ni镀层的极化曲线和电化学阻抗谱(EIS)研究其腐蚀性能。结果表明：在实验脉冲频率范围内(30~100 kHz)，提高脉冲频率，可使Ni镀层晶粒细化；电极过程的转移电阻从30 kHz时沉积Ni镀层的1.97×104 Ω·cm2增大到100 kHz时的6.56×104 Ω·cm2，自腐蚀电位从−551.41 mV 正移到−420.28 mV，这表明高频沉积的Ni镀层晶粒更细小，致密性更高，因而耐蚀性更强。摩擦试验结果表明：摩擦因数由30 kHz时沉积Ni镀层的0.39降低到100 kHz时的0.25，说明高频沉积的Ni镀层具有更强的耐磨性；镀层晶粒细化、较高的致密性和硬度是耐磨性提高的主要原因。
关键字: Ni镀层；脉冲电沉积；耐蚀性；摩擦因数
（1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing,
Beijing 100083, China;
2. International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, China;
3. National Key Laboratory for Surface Physics and Chemistry, Chinese Academy of Engineering Physics, Mianyang 621900, China）
Abstract:The effects of pulse frequency on the microstructure, corrosion and wear resistance properties of a nanocrystalline Ni coating produced by high frequency pulsed-electrodeposition technique were studied. The corrosion behavior of the Ni deposit was also evaluated by polarization curves and electrochemical impedance spectroscopy (EIS) in 50 μg/g potassium chloride aqueous solution with at room temperature. The results show that the grain size of the Ni coating is refined with the increase of pulse frequency from 30 to 100 kHz. The charge transfer resistance and self-corrosion potential of the coating are increased from 1.97×104 to 6.56×104 Ω·cm2 and from −551.41 to −420.28 mV, respectively with increasing frequency from 30 to 100 kHz, revealing that the corrosion resistance of the Ni coating is improved owing to its grain-refinement and higher compactness. The tribological tests show that the friction coefficient of the Ni coating decreases from 0.39 to 0.25 with frequency increasing from 30 to 100 kHz. The reason is suggested to its grain-refinement, higher compactness and microhardness.
Key words: Ni coating; pulsed-electrodeposition; corrosion resistance; friction coefficient
