(1. 北京科技大學 新金屬材料國家重點實驗室，北京 100083；
2. 中國科學院 國際材料物理中心，沈陽 110016；
3. 中國工程物理研究院 表面物理與化學國家重點實驗室，綿陽 621900)
摘 要: 采用高頻脈沖電沉積制備納米Ni鍍層，研究高頻脈沖頻率對納米Ni鍍層組織、腐蝕性能和摩擦性能的影響；室溫下，在含50 μg/g Cl−的氯化鉀溶液中通過測試Ni鍍層的極化曲線和電化學阻抗譜(EIS)研究其腐蝕性能。結果表明：在實驗脈沖頻率范圍內(30~100 kHz)，提高脈沖頻率，可使Ni鍍層晶粒細化；電極過程的轉移電阻從30 kHz時沉積Ni鍍層的1.97×104 Ω·cm2增大到100 kHz時的6.56×104 Ω·cm2，自腐蝕電位從−551.41 mV 正移到−420.28 mV，這表明高頻沉積的Ni鍍層晶粒更細小，致密性更高，因而耐蝕性更強。摩擦試驗結果表明：摩擦因數(shù)由30 kHz時沉積Ni鍍層的0.39降低到100 kHz時的0.25，說明高頻沉積的Ni鍍層具有更強的耐磨性；鍍層晶粒細化、較高的致密性和硬度是耐磨性提高的主要原因。
關鍵字: Ni鍍層；脈沖電沉積；耐蝕性；摩擦因數(shù)
（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
