NiCo-SiC纳米复合镀层的耐蚀性和摩擦学性能  

Corrosion resistance and tribological properties of NiCo-SiC nanocomposite coatings

作　　者：石雷[1] 周峰[1] 孙初锋[1] 刘维民[1] 

机构地区：[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

出　　处：《中国有色金属学报》2005年第4期536-540,共5页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(50272068)

摘　　要：用电沉积方法在不锈钢表面制备了NiCo2SiC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;NiCo2SiC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。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.

关 键 词：电沉积 SIC 纳米复合镀层 摩擦学性能 

分 类 号：TB333[一般工业技术—材料科学与工程] TH117.3[机械工程—机械设计及理论]