海水环境下均质和梯度CrCN薄膜摩擦学性能研究

The Tribological Properties of Uniform and Gradient CrCN Coating in Seawater

摘要:

利用多弧离子镀技术在316L不锈钢和单晶硅上制备了均质和梯度CrCN薄膜，通过X射线衍射仪(XRD)、扫描电镜(SEM)、X射线光电子能谱仪(XPS)、纳米压痕仪、273A电化学工作站、Revetest划痕测试系统和多功能摩擦磨损试验机等对薄膜的微观结构、力学性能、耐腐蚀性能和摩擦学性能进行表征。结果表明：较之于均质CrCN薄膜，梯度CrCN薄膜平均晶粒较小，Cr7C3(421)晶面的结晶度高，力学性能较好；在海水环境下，梯度CrCN薄膜在摩擦过程中对裂纹的萌生及扩展有较强的抑制作用，能有效抵制海水渗透，表现出良好的耐腐蚀性能；与WC摩擦配副对磨时平均摩擦系数与磨损率均较低，磨痕形貌光洁，表现出良好的摩擦学性能。

Abstract:

In order to improve the tribological properties of sea frictional key components, uniform and gradient CrCN coating were deposited on 316L stainless steel and single crystal silicon by multi arc ion plating technique. The microstructures, mechanical performance, corrosion resistance and tribological properties in seawater were systematically investigated by XRD, XPS, SEM, Scratch test system, nano-indentation, 273A electrochemical workstation and ball-on-disc tribol-meter. The results showed that the grain size, crystallinity of Cr7C3(421), mechanical performance and corrosion resistance of gradient CrCN coating were better than uniform CrCN coating. Friction coefficient and wear ratio in seawater of gradient CrCN coating were lower than uniform CrCN coating, which indicates the gradient CrCN coating has a good tribological properties than uniform CrCN coating.