Abstract Since amorphous alloys exhibit good wear and corrosion resistance, they are supposed to be applied as a candidate implant material. In this work, using laser cladding, Multi-layer Fe-based alloy coatings were fabricated from amorphous powders on 316L stainless steel (SS) substrate. When the number of cladding layers increases, the microstructure of the coating was mainly composed of γ-Fe firstly, then evolved to γ-Fe and α-Fe solid solutions, and then to a composite of amorphous and crystalline phases. The surface hardness of the coating was also enhanced consequently to over 1200 HV. During reciprocate sliding against an Alumina ball in a simulated body fluid (Ringer's solution), the volume loss and the coefficient of friction (COF) of the coatings generally decreased firstly and then increased with the number of cladding layers. During sliding at open circuit, the drop in open circuit potential (OCP) of all the Fe-based coatings, except for the 1-layer one, was not as significant as that of the 316 SS substrate. Moreover, when applying a cathodic potential during sliding, no obvious protective effect was obtained for the coatings, which indicates that the multi-layer Fe-based coatings possess a good corrosion-induced wear resistance in comparison to 316L SS. Because of the formation of an electric double layer, the fixed potential of 100 mVSCE or −600 mVSCE was beneficial to reduce the COF, especially for 316L SS. The tribocorrosion at OCP showed that the 2-layer coating possessed the best corrosive wear resistance, and its COF and volume loss were about 3 and 5.6 times lower than those of the substrate. The material loss in Ringer's solution at OCP is mainly controlled by the mechanical wear for the coatings and the synergism between corrosion and wear for the substrate. Furthermore, this work provides a way to optimize the tribology system by adjusting the number of cladding layers to reduce COF and wear in a simulated body fluid.

中文翻译：

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非晶粉末激光熔覆多层铁基涂层的腐蚀磨损

摘要 由于非晶合金具有良好的耐磨性和耐腐蚀性，可作为候选的植入材料。在这项工作中，使用激光熔覆，在 316L 不锈钢 (SS) 基材上由非晶粉末制造多层铁基合金涂层。随着熔覆层数的增加，镀层的显微组织首先主要由γ-Fe组成，然后演化为γ-Fe和α-Fe固溶体，再演化为非晶相和晶相的复合相。 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 涂层的表面硬度也因此提高到超过 1200 HV。在模拟体液（林格溶液）中与氧化铝球往复滑动过程中，涂层的体积损失和摩擦系数（COF）一般随着包覆层数的增加而先减小后增大。在开路滑动过程中，除 1 层涂层外，所有 Fe 基涂层的开路电位 (OCP) 的下降都不如 316 SS 基材那么显着。此外，当在滑动过程中施加阴极电位时，涂层没有获得明显的保护作用，这表明与 316L SS 相比，多层铁基涂层具有良好的耐腐蚀磨损性。由于双电层的形成，100 mVSCE 或-600 mVSCE 的固定电位有利于降低 COF，尤其是对于 316L SS。OCP 的摩擦腐蚀表明，2 层涂层具有最好的耐腐蚀耐磨性，其 COF 和体积损失比基体低约 3 倍和 5.6 倍。Ringer' 中的材料损失 OCP 的解决方案主要受涂层的机械磨损和基材腐蚀和磨损之间的协同作用控制。此外，这项工作提供了一种通过调整包覆层数来优化摩擦学系统的方法，以减少模拟体液中的 COF 和磨损。