基材表面粗糙度对镀铬层膜基结合性能的影响

为了提高紧固件的摩擦磨损性能,采用直流电镀工艺,在1Cr13钢表面制备了单层标准镀铬层,研究了基材1Cr13钢表面粗糙度对其表面镀铬层的组织结构与膜基结合强度的影响.利用激光共聚焦显微镜、扫描电子显微镜、能谱仪、X射线衍射仪、显微硬度计与多功能材料表面性能测试仪对镀铬层的微观组织、相结构、显微硬度及膜基结合强度进行了分析.结果表明,随着基材表面粗糙度的降低,镀铬层表面更加致密、均匀,微裂纹数量明显减少,镀铬层的显微硬度增加,临界载荷达到了38.7 N,膜基结合强度得到明显提高.

Influence of surface roughness of substrate on coating substrate adhesive properties of electroplated Cr layer

In order to improve the friction and wear properties of fasteners, the single layer standard electroplated Cr layer was prepared on the surface of 1Cr13 steel with the direct current electroplating process. The effect of surface roughness of 1Cr13 steel substrate on the microstructure of electroplated Cr layer and adhesive strength of coating substrate was investigated. The microstructure, phase constituent, microhardness, adhesive strength of coating substrate for the electroplated Cr layer were characterized with the laser scanning confocal microscope （LSCM）, scanning electron microscope （SEM）, energy dispersive spectroscope （EDS）, X ray diffractometer （XRD）, microhardness tester and multifunctional materials surface performance tester. The results show that with decreasing the surface roughness of substrate, the surfaces of electroplated Cr layer become denser and more uniform. The number of micro cracks significantly decreases, while the microhardness of electroplated Cr layer increases. Moreover, the critical load reaches 38.7N, and the coating substrate adhesive strength gets obviously improved. 