电沉积Cr/ZrO_2复合镀层的结构和摩擦性能  

Structure and friction behavior of electrodeposited Cr/ZrO_2 nano-composite coatings

作　　者：舒绪刚[1] 何湘柱[2] 黄慧民[2] 李大光[2] 谢绍俊[2] 雷华山[2] 赵国鹏 

机构地区：[1]仲恺农业工程学院化学化工学院,广东广州510225 [2]广东工业大学轻工化工学院,广东广州510006 [3]广州市二轻工业科学技术研究所,广东广州510663

出　　处：《中南大学学报（自然科学版）》2010年第3期871-875,共5页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(50004003);广东省科委重大工业攻关项目(045040037)

摘　　要：采用复合电沉积工艺制备Cr/ZrO2纳米复合镀层,分别用扫描电子显微镜(SEM)、扫描电子显微镜附带能谱仪(EDS)、X线衍射(XRD)等技术较系统地研究了Cr/ZrO2纳米复合镀层的表面形貌、成分、结构和耐磨性。研究结果表明:复合镀层的中ZrO2的复合量质量分数为1.47%,在ZrO2纳米粒子的弥散强化作用下,Cr/ZrO2复合镀层无裂纹,组织致密,结构呈现明显的非晶态特征;在干摩擦条件下,纳米Cr/ZrO2复合镀层的摩擦性能明显优于3价铬镀层的摩擦性能;纳米Cr/ZrO2复合镀层的磨损主要表现为疲劳磨损特征,而3价铬镀层的磨损机制为磨料磨损。New Cr/ZrO2 nano-composite layers were prepared by composite electrodeposition technology. The morphology,composition,structure and friction resistance properties of the coatings were systematically characterized by means of SEM,EDS,X-ray diffraction and potentiostat methods. The worn surfaces of Cr coatings and Cr matrix composite coatings,were analyzed with a SEM and XPS. The results show that the mass composition of the obtained ZrO2 composite coating is 1.47%,the crack condition of Cr coatings is improved markedly by the dispersion strengthening effect of the ZrO2 nano-particle. Meanwhile,the composite coatings present an obvious amorphous characteristics,compact structure,and uniform composition. The friction and wear properties of the composite coatings is investigated using a pin-on-disc sliding wear machine under dry friction conditions. In comparison with Cr coatings,the friction resistance of the composite coatings is higher,the wear mechanism of nanometer ZrO2 particles reinforced Cr matrix composite coating is characterized by slight fatigue wear,while that of trivalent Cr coating is characteristic of abrasive wear.

关 键 词：电沉积 纳米复合镀层 非晶态 耐磨性 

分 类 号：TQ153.11[化学工程—电化学工业] TG174.4[金属学及工艺—金属表面处理]