超声辅助换向脉冲喷射电沉积钴–碳化铬复合镀层  

Preparation of cobalt–chromium carbide composite coating by ultrasound-assisted pulse-reverse jet electrodeposition

作　　者：宋皓[1] 谭俊[1,2] 郑晓辉[1] 张庆[1] 王猛[1] 

机构地区：[1]装甲兵工程学院表面工程重点实验室,北京100072 [2]装备再制造技术国防科技重点实验室,北京100072

出　　处：《电镀与涂饰》2017年第17期903-910,共8页Electroplating & Finishing

基　　金：装备预研基金(9140C850202100C85)

摘　　要：采用超声辅助换向脉冲喷射电沉积技术在45钢表面制备了Co–Cr_3C_2复合镀层。研究了超声功率和超声间歇时间对Co–Cr_3C_2复合镀层的Cr_3C_2颗粒质量分数、微观形貌、显微硬度、表面粗糙度和耐磨性的影响。超声波的加载极大地改善了复合镀层的组织结构和性能。超声功率为36 W、超声间歇为8 s时,Co–Cr_3C_2复合镀层的表面粗糙度最低,均匀致密,鲜有孔隙,Cr_3C_2颗粒在镀层中的质量分数达到26.85%并均匀地分布在钴基质中,其显微硬度高达695 HV,摩擦因数仅为0.12。该复合镀层在800℃时仍有很好的热稳定性。当热处理温度高于500℃时,复合镀层的显微硬度明显高于硬铬镀层。A Co--Cr3C2 composite coating was obtained on the surface of 45 steel by ultrasound-assisted pulse-reverse jet electrodeposition. The effects of ultrasound power and interval time on mass fraction of Cr3Ce particles, surface morphology, microhardness, surface roughness and wear resistance of Co--Cr3C2 composite coating were studied. The assistance of ultrasound greatly improves the structure and properties of Co-Cr3C2 composite coating. The composite coating obtained at an ultrasound power of 36 W with an ultrasound interval time of 8 s has the lowest surface roughness, uniform and compact surface with few pores, 26.85wt% Cr3C2 particles, which are evenly distributed in the cobalt matrix, a microhardness up to 695 HV, and a friction coefficient as low as 0.12. The composite coating presents a good thermal stability at 800 ℃. Its microhardness is apparently higher than that of hard chromium coating after heat treatment at 500℃.

关 键 词：钴 碳化铬 复合镀层 喷射电沉积 超声辅助 换向脉冲 热稳定性 

分 类 号：TQ153.2[化学工程—电化学工业]