热处理对掺铜Cr-C镀层结构、磨损性能的影响  

Influence of Heat Treatment on Phase Composition and Wear Resistance of Electroplated Chromium-Carbon-Copper Coatings

作　　者：倪利炜[1] 梁爱民[2] 杜振亭[1] 

机构地区：[1]西北农林科技大学理学院,陕西杨凌712100 [2]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,甘肃兰州730000

出　　处：《材料保护》2012年第9期25-28,38,共5页Materials Protection

摘　　要：为了全面了解热处理温度对Cr-C-Cu电镀层性能的影响,分别使用XPS,XRD,MH-5-VM显微硬度仪和SRV-IV微动摩擦磨损试验机考察了不同热处理温度下镀层的形貌、成分、硬度及磨损性能。结果表明:三价铬镀铬液中掺入铜离子更易获得平整均匀的镀层;Cr-C-Cu镀层镀态及其200℃热处理后的主要物相为非晶相,400℃热处理后的主要物相为具有面心立方Cu(fcc Cu)晶格的Cr-Cu固溶体合金相,600℃热处理后的Cr-C-Cu镀层中的主要物相转变为具有体心立方Cr(bcc Cr)晶格的Cr-Cu固溶体合金相;Cu原子在Cr-C-Cu镀层中以金属键的形式存在;Cr-C-Cu镀层镀态时具有最佳的抗磨损性能,随着热处理温度升高,抗磨损性能呈先降后升的趋势,经400℃热处理后的镀层抗磨性最差;Cr-C-Cu镀层在镀态和经不同温度热处理后的抗磨性能均优于同样条件下的Cr-C镀层。Cu-doped Cr-C coatings(denoted as Cr-C-Cu) were prepared by electroplating.Resultant electroplated Cr-C-Cu coatings were heat treated at different temperatures.The morphology and phase composition of as-plated and heat-treated Cr-C-Cu coatings were analyzed by means of scanning electron microscopy and X-ray diffraction.An MH-5-VM microhardness gauge was performed to measure the microhardness of as-plated and heat-treated Cr-C-Cu coatings,and an SRV-IV fretting test rig was performed to evaluate the wear resistance of the coatings.Further,the effect of heat treatment on the properties of the electroplated Cr-C-Cu coatings was examined.Results indicate that introducing Cu2+ in the plating bath is favorable for improving the smoothness and evenness of Cr-C-Cu coating.As-plated Cr-C-Cu coating and the one heat-treated at 200 ℃ consist of amorphous phase.Cr-C-Cu coating heat-treated at 400 ℃ consists of Cr-Cu solid solution alloy with face-centered cubic lattice of Cu,and the one heat-treated at 600 ℃ consists of Cr-Cu solid solution alloy with body-centered cubic lattice of Cr.Besides,Cu atoms form metal bond in the coating,and as-plated Cr-C-Cu coating has the best wear resistance.Moreover,the wear resistance of the Cr-C-Cu coating initially tends to rise but later decline with rising heat-treatment temperature,and the Cr-C-Cu coating heat-treated at 400 ℃ shows the worst wear resistance.However,as-plated Cr-C-Cu alloy coating and those heat-treated at different temperatures show better wear resistance than corresponding Cr-C alloy coatings.

关 键 词：三价铬电镀 Cr—C-Cu合金镀层 热处理 相组成 磨损性能 

分 类 号：TQ153.2[化学工程—电化学工业]