High-entropy alloys (HEAs) with multiple principal elements represent a paradigm shift in structural alloy design and show excellent surface degradation resistance in corrosive environment. Here, the tribo-corrosion response of laser-engineered net-shaped CoCrFeMnNi HEA was evaluated in 3.5 wt% NaCl solution at room temperature. The additively manufactured (AM-ed) CoCrFeMnNi showed five times lower wear rate, regenerative passivation, and nobler corrosion potential during tribo-corrosion test compared to its arc-melted counterpart. A significant anisotropy was seen in the tribo-corrosion response with 45° to the build direction showing better performance compared to tests along the build direction and perpendicular to it. The open circuit potential curves were characterized by a sharp drop to more negative values as wear began, followed by continuous change for the active tribo-corrosion duration and finally a jump to nobler value at the end of the test indicating excellent surface re-passivation for the AM-ed alloy. The superior tribo-corrosion resistance of AM-ed CoCrFeMnNi was attributed to the refined microstructure and highly protective surface passivation layer promoted by the sub-grain cellular structure formed during additive manufacturing. These results highlight the potential of utilizing additive manufacturing of HEAs for use in extreme environments that require a combination of tribo-corrosion resistance, mechanical durability, extended service life, and net shaping with low dimensional tolerance.

具有多种主要元素的高熵合金 (HEA) 代表了结构合金设计的范式转变，并在腐蚀环境中显示出优异的表面抗降解性。在这里，在室温下在 3.5 wt% NaCl 溶液中评估了激光工程网状 CoCrFeMnNi HEA 的摩擦腐蚀响应。与电弧熔化的对应物相比，增材制造（AM-ed）CoCrFeMnNi 在摩擦腐蚀试验中显示出低五倍的磨损率、再生钝化和更高的腐蚀潜力。在与构建方向成 45° 的摩擦腐蚀响应中观察到显着的各向异性，与沿构建方向和垂直于构建方向的测试相比，表现出更好的性能。开路电位曲线的特点是随着磨损开始急剧下降到更负的值，随后是活性摩擦腐蚀持续时间的连续变化，最后在测试结束时跃升至更高的值，表明 AM 合金具有出色的表面再钝化。AM-ed CoCrFeMnNi 优异的抗摩擦腐蚀性能归因于增材制造过程中形成的亚晶胞结构促进了精细的微观结构和高度保护的表面钝化层。这些结果突出了利用 HEA 增材制造在极端环境中使用的潜力，这些环境需要兼具耐摩擦腐蚀性、机械耐久性、延长使用寿命和低尺寸公差的净成型。