换向脉冲喷射电沉积制备Co-Cr_3C_2复合镀层的工艺探讨  

Discussion on the Process for Preparing Co-Cr_3C_2 Composite Coatings by Reverse Pulse Jet-electrodeposition

作　　者：王猛[1] 谭俊[1,2] 吴迪[1] 兰龙[3] 

机构地区：[1]装甲兵工程学院再制造技术重点实验室,北京100072 [2]装甲兵工程学院表面工程重点实验室,北京100072 [3]中国西安卫星测控中心三亚航天测控站,海南三亚572427

出　　处：《表面技术》2016年第5期135-142,共8页Surface Technology

基　　金：装备预研基金(9140C850202100C85)~~

摘　　要：目的有效解决利用喷射电沉积在直流电流下制备的复合镀层存在的镀层表面粗糙,尤其当硬质颗粒尺寸达到微米级时,表面恶化程度尤为严重的问题。方法将换向脉冲电流取代直流电流应用于喷射电沉积,制备颗粒尺寸达到微米级的Co-Cr_3C_2复合镀层,通过分析复合镀层组织形貌、硬度和耐磨性等,探讨换向脉冲电参数对复合镀层颗粒复合量、镀层表面粗糙度以及镀层性能的影响,并对其影响机理进行分析。结果在保持颗粒较高含量复合的同时提高镀层表面平整度,通过控制脉冲电参数,制备出复合微米级Cr_3C_2颗粒平整、颗粒质量分数为11%的Co-Cr_3C_2复合镀层。结论 Cr_3C_2颗粒的复合量越高,镀层性能越优异,但镀层表面也更加粗糙,换向脉冲电流的反向过程可发生共沉积的逆过程,利用脉冲电流不仅对复合镀层起到整平的作用,同时可以提高颗粒在复合镀层中分散的均匀性,使复合镀层的表面形貌以及性能均得到明显改善。Objective To efficiently solve the problem that the coating surface prepared by DC jet-electrodeposition is quite rough, and the surface deterioration degree is particularly serious when the hard particle size reaches micron grade. Methods Reverse pulse current was applied in jet-electrodeposition instead of DC to prepare the Co-CraC2 composite coatings which the size of Cr3C2 reaching micron grade. Through analyzing the composite tissue morphology and testing hardness, wear resistance and other perfor- mance parameters, the effect of commutation pulse electrical parameters on the composite coating particle composite coating, the roughness of the coating and the coating performance were discussed, and the influencing mechanism was analyzed. Results Using pulse current to prepare Co-Cr3C2 composite coating could improve the surface roughness while maintaining higher concentration of the particles. By controlling the pulse electric parameters, micron grade Co-CraC2 composite coating with particle content of up to 11% was prepared. Conclusion The higher the Cr3C2 particle content in the composite coating, the better the coating performance, but the more rough the coating surface. The reversing of the reverse pulse current could lead to the inverse process of co-deposition. The usage of RPC could not only make the composite coating flat, but also improve the uniformity of particles dispersed in the composite coating, improving both the surface morphology and properties of the composite coating.

关 键 词：脉冲电沉积 喷射电沉积 钴基镀层 碳化铬 复合镀层 微米颗粒 

分 类 号：TQ153.1[化学工程—电化学工业]