基体表面粗糙度对纳米复合镀层组织及性能的影响

Influence of Surface Roughness of Substrates on Microstructure and Properties of Nano Composite Coatings

采用电刷镀技术在不同表面粗糙度的W18Cr4V高速钢基体上制备了纳米PTFE和纳米WC颗粒增强的镍基复合镀层,采用扫描电镜对纳米复合镀层的表面和截面形貌进行了观察,研究了基体表面粗糙度对纳米复合镀层耐磨性、耐蚀性和结合强度的影响。结果表明:随着基体表面粗糙度的减小,纳米复合镀层的表面更加平整致密,组织更加细小均匀,镀层厚度减小,镀层中的裂纹数量减少,镀层的耐磨性、耐蚀性和结合强度均得到明显提高。

FTFE and WC nano particles strengthened nickle base nano composite coatings were prepared by electro-brush plating on W18Cr4V high speed steels with different surface roughnesses. The morphology of surface and cross-section of the nano composite coatings was studied by SEM and the effect of surface roughness of substrate on the wear resistance, corrosion resistance and bind strength of the nano composite coatings were studied. The results show that with the decrease of the substrate surface roughness, surface of the nano composite coatings became smootner and denser, the microstructure became finer and more uniform, the coatings thickness reduced, cracks number decreased, and the wear resistance, corrosion resistance and bind strength were obviously improved.