电沉积非晶态Ni-W-B/ZrO_2复合镀层及其结构与性能  

Electrodeposition, Structure and Properties of an Amorphous Ni W B/ZrO_2 Composite Coating

作　　者：杨防祖[1] 马兆海[1] 黄令[1] 许书楷[1] 周绍民[1] 

机构地区：[1]厦门大学化学系固体表面物理化学国家重点实验室物理化学研究所,厦门361005

出　　处：《物理化学学报》2004年第12期1411-1416,共6页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(29773039);福建省自然科学基金(E0210005)资助项目~~

摘　　要：在含有二氧化锆的Ni-W-B电解液中,电沉积获得Ni-W-B/ZrO2复合镀层.用差示扫描量热分析(DSC)、X射线衍射(XRD)、扫描电子显微镜(SEM)和电化学技术较系统地研究了Ni-W-B/ZrO2复合镀层的电沉积、热处理过程,以及镀层的结构、表面形貌、显微硬度和耐腐蚀性能.结果表明,复合镀层的质量组成为Ni47.5%、W40.9%、B0.9%和ZrO210.7%.DSC和XRD结果清楚说明,二氧化锆对基质Ni-W-B镀层的结构有明显影响,使得复合镀层的非晶态结构特征更加明显.复合镀层比Ni-W-B合金有更高的显微硬度,呈现团粒状结构,晶块之间不存在裂纹但晶界清晰可辨;二氧化锆粒子分散于Ni-W-B基质镀层中.400℃、1h热处理后,Ni-W-B基质镀层中W向镀层表面偏析,镀层呈现固溶体晶态结构特征,表面形貌特征基本不变,复合镀层的显微硬度进一步提高,抗腐蚀性能增强,但镀层表层中的二氧化锆粒子大量脱落.Ni-W-B/ZrO2 composite coating was electrodeposited from the Ni-W-B electrolyte solution containing zirconia particles. The electrodeposition, heat treatment, structure, surface morphology, microhardness, and corrosion resistance of the composite coating were studied by means of differential scanning calorimeter (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical techniques. The results showed that the mass composition of the obtained Ni-W-B/ZrO2 composite coating was Ni 47.5%, W 40.9%, B 0.9% and ZrO2 10.7%. DSC combined with XRD results illustrated that zirconia took a remarkable influence on the structure of Ni-W-B matrix, leading the composite coating to a more obvious amorphous characteristics. The composite coating presented in higher microhardness compared to Ni-W-B alloy, granular structure with grain boundaries and. crack-free. Zirconia particles were dispersed in the Ni-W-B matrix. After heat treatment at 400 degreesC for 1 h, surface morphology of the coating was kept almost no changes. The structure of the matrix was transferred to a crystal of Ni-W solid solution, and W was segregated to the surface of the deposit. The microhardness and corrosion resistance were enhanced, whereas most of zirconia particles were gotten rid of from the surface layer.

关 键 词：镍基合金 复合镀层 电沉积 非晶态合金 热处理 

分 类 号：TQ153[化学工程—电化学工业]