启闭机活塞杆表面超音速火焰喷涂WC-10Co-4Cr涂层的性能

Properties of WC-10Co-4Cr Coatings Sprayed by HVOF on Hoist Piston Rod Surface

采用超音速火焰热喷涂技术在启闭机活塞杆材料40Cr钢表面制备WC-10Co-4Cr涂层,通过扫描电镜、X射线衍射仪、显微硬度计、摩擦磨损试验机、电化学工作站等手段对涂层的基本性能进行了研究并与基材的性能进行了对比分析。结果表明:涂层的显微硬度为1 330HV0.3是基体的3.9倍,摩擦因数小于基体,其耐磨性能达到基体的145倍,涂层的耐腐蚀性能较基体也有大幅提高,并且涂层致密度高孔隙率低于0.45%,与基体之间的结合强度高于70.37MPa。将涂层应用于活塞杆表面可以大幅提高其表面性能,特别是耐磨性能及耐腐蚀性能,使得活塞杆的使用寿命提高为常用电镀铬的3倍以上。

WC-10Co-4Cr coatings were prepared on hoist piston rod surface by high velocity oxygen fuel（HVOF）spraying.The basic performance of the coatings and matrix were investigated by using scanning electron microscopy（SEM）,X-ray diffraction（XRD）,hardness measurement,wear test,electrochemical workstation etc.Results show that the micro-hardness of the coatings is 1 330HV0.3,which is 3.9times the micro-hardness of the matrix;the friction coefficient is lower than that of the matrix,which is 145times the wear resistance of the matrix;the corrosion resistance of the coatings significantly increases,the porosity of coatings is less than 0.45%,and the binding strength between the coatings and the matrix is higher than 70.37MPa.The surface properties of the piston rod can be significantly improved by coatings,especially the wear resistance and the corrosion resistance.This makes that the service time of the piston rod is 3times higher than that of the chrome plating.