摘要
为研究纳米金刚石(UFD)含量对金刚石-铬(Ⅲ)复合镀层性能的影响,将UFD在水介质中分散改性后添加到三价铬镀液中进行复合电镀。采用扫描电镜、微磨损试验机和显微硬度计对三价铬电镀和UFD复合电镀所得镀层的微观形貌、耐磨性和硬度等性能进行了测试与表征。结果表明:加入少量十二烷基苯磺酸钠(SDBS)改性的UFD就能有效改善复合镀层的性能,电镀64 min的SDBS-UFD(0.050 g)复合镀层的最大硬度值为746.6HV,较相同电镀时间的纯铬镀层有所增加;随着UFD用量的增加,镀层中的碳含量随之增加,镀层硬度呈下降趋势,但镀层表面晶粒明显细化,且镀层更为均匀平整;UFD的加入能降低镀层的摩擦系数,并随UFD含量的增加而减小。电镀64 min的纯铬镀层平均摩擦系数为0.635 4,而电镀64 min的SDBS-UFD(0.100 g)复合镀层的平均摩擦系数为0.409 3,UFD的加入起到了修复填平的作用,有效地降低了镀层的摩擦系数,提高了镀层的耐磨性。
Nanometer diamond was dispersed in aqueous medium containing sodium dodecyl benzene sulfonate(SDBS) and introduced into the bath for electroplating of Cr(Ⅲ),generating modified nanometer diamond-Cr(Ⅲ) composite coating.The microstructure of as-prepared nanometer diamond-Cr(Ⅲ) composite coating was observed using a scanning electron microscope,and its wear resistance and hardness were evaluated using a micro-friction and wear tester and a hardness meter.Results indicate that introducing a small amount of nanometer diamond modified by SDBS helps to effectively improve the properties of the composite coating.The composite coating plated in the bath containing 0.050 g SDBS-modified nanometer diamond for 64 min had a maximum hardness of 746.6 HV,which was slighdy higher than that of Cr coating obtained at the same plating duration.With the increase of content of diamond in the plating bath,carbon content of the composite coating rose,and its hardness tended to decline,accompanied by refinement of surface particles and increase of uniformity and smoothness therewith.Moreover,introducing nanometer diamond into the plating bath led to decreased friction coefficient of the composite coating,and the friction coefficient declined with increasing content of nanometer diamond.Cr(Ⅲ) coating had an average friction coefficient of 0.635 4,and the composite coating obtained from the plating bath containing 0.100 g SDBS-modified nanometer diamond had a friction coefficient of 0.409 3.SDBS-modified nanometer diamond was able to repair and fill up the surface defects of the composite coating,resulting in significantly decreased friction coefficient and increased wear resistance.
出处
《材料保护》
CAS
CSCD
北大核心
2011年第10期16-18,6-7,共3页
Materials Protection
关键词
复合电镀
三价铬
改性纳米金刚石
十二烷基苯磺酸钠
微观形貌
硬度
耐磨性
composite coating
Cr(Ⅲ)
modified nanometer diamond
sodium dodecyl benzene sulfonate
microstructure
hardness
wear resistance
