( 1. 中国科学院 兰州化学物理研究所 固体润滑国家重点实验室,
兰州 730000;
2. 中国科学院研究生院, 北京 100039)
摘 要: 用电沉积方法在不锈钢表面制备了NiCo-SiC纳米复合镀层， 考察了不同纳米颗粒含量镀液的阴极极化曲线， 测定了纳米复合镀层的晶体结构， 分析了镀层的表面形貌和磨损形貌。结果表明： 加入纳米SiC颗粒后， 金属的还原电位发生负移， 镀层表面晶粒形貌由针状变为颗粒状； NiCo-SiC纳米复合镀层比NiCo合金镀层具有更好的抗腐蚀性和摩擦学性能；磨损表面形貌显微分析表明合金镀层的磨损机制主要是粘着磨损， 表面发生了严重的擦伤和塑性变形， 而纳米复合镀层的磨损机制是典型的磨粒磨损。
关键字: 电沉积； SiC； 纳米复合镀层； 摩擦学性能
（ 1. State Key Laboratory of Solid Lubrication,
Lanzhou Institute of Chemical Physics,
Chinese Academy of Sciences, Lanzhou 730000, China;
2. Graduate School of Chinese Academy of Sciences, Beijing 100039, China）
Abstract: NiCo-SiC nanocomposite coatings were electrodeposited on stainless steel. The cathodic polarization curves for the co-deposition of NiCo-SiC at different concentrations of SiC particulates in the plating bath were measured by Chi660B electrochemistry station. The microstructure of the nanocomposite coatings was characterized. The surface morphology and worn track of the coatings were analyzed. The results show that the addition of SiC nano-particles to the electrolyte causes the reduction potential of Ni-Co to shift towards larger negative. The morphology of the coating changes from needle-like to granular. The NiCo-SiC nanocomposite coatings have better corrosion resistance and tribological property than NiCo alloy coatings. Observation of the morphology of the worn surfaces indicates that the alloy coating is characterized by adhension, sever scuffing and plastic deformation, while the nanocomposite coating is characterized by typical abrasive wear.
Key words: electrodeposition; SiC; nanocomposite coating; tribological properties
