结构钢电沉积Co-W/CeO_(2)复合镀层及其性能研究  

Study on properties of Co-W/CeO_(2) composite coatings electrodeposited on structural steel

作　　者：葛志华[1] 武海勇[1] 张柳[2] Ge Zhihua;Wu Haiyong;Zhang Liu(Cangzhou Vocational and Technical College,Cangzhou 061001,China;Tangshan College,Tangshan 063000,China)

机构地区：[1]沧州职业技术学院,河北沧州061001 [2]唐山学院,河北唐山063000

出　　处：《电镀与精饰》2024年第3期16-24,共9页Plating & Finishing

基　　金：河北省重点研发计划项目(18274517)。

摘　　要：选择CeO_(2)颗粒作为复合相,利用电沉积技术在普通结构钢表面制备出Co-W/CeO_(2)复合镀层,并研究镀液中CeO_(2)颗粒浓度对复合镀层的微观形貌、化学成分、结合力、硬度、耐磨性能以及高温抗氧化性能的影响。结果表明:Co-W/CeO_(2)复合镀层与基体结合牢固,表面分布着类似胞状的晶粒团聚体,其化学成分为Co、W、Ce和O元素。随着镀液中CeO_(2)颗粒浓度从2 g/L升高到15 g/L,复合镀层的晶粒团聚体尺寸差异先减小后增大,吸附在晶粒团聚体表面及边界处的CeO_(2)颗粒量先增多后减少,导致复合镀层的硬度、耐磨性能和高温抗氧化性能都呈先增强后下降的趋势。当镀液中CeO_(2)颗粒浓度为8g/L时,Co-W/CeO_(2)复合镀层的晶粒团聚体大小较为均匀,具有良好的致密性,其表面粗糙度仅为0.39μm。该复合镀层的硬度较Co-W合金镀层增大约76 HV,表现出良好的耐磨性能和高温抗氧化性能,摩擦系数和氧化增重量仅为0.43和0.74mg/cm^(2)。Co-W/CeO_(2) composite coatings were prepared on the surface of ordinary structural steel by electrodeposition,and the effect of concentration of CeO_(2) particles in the bath on the microstructure,chemical composition,binding force,hardness,wear resistance and high temperature oxidation resis‐tance of the composite coating was investigated.The results show that Co-W/CeO_(2) composite coating is firmly bound to the substrate,there are cell like grain aggregates distributed on the surface,with chemi‐cal compositions of Co,W,Ce,and O.As the concentration of CeO_(2) particles in the bath increased from 2 g/L to 15 g/L,the difference of grain aggregate size of the composite coating first decreased and then increased,and the amount of CeO_(2) particles adsorbed on the surface and boundary of the grain aggregate first increased and then decreased.As a result,the hardness,wear resistance and high temper‐ature oxidation resistance of the composite coating increased first and then decreased.When the concen‐tration of CeO_(2) particles in the bath is 8 g/L,the Co-W/CeO_(2) composite coating has good densification,the grain aggregate size is more uniform,and its surface roughness is only 0.39μm.The hardness of the composite coating is about 76 HV higher than that of Co-W alloy coating,and the composite coating also shows good wear resistance and high temperature oxidation resistance.The friction coefficient and oxidation weight gain are only 0.43 and 0.74 mg/cm^(2).

关 键 词：Co-W/CeO_(2)复合镀层 电沉积 CeO_(2)颗粒 结合力 高温抗氧化性能 

分 类 号：TQ153[化学工程—电化学工业]