Abstract Corrosion behavior in 5.2 M aqueous hydrofluoric acid solution and tensile properties of Ni-30Co-16Cr-15Mo-6Fe-xCu (x = 0, 0.5, 2, and 6) (mass%) alloys are investigated. The corrosion resistance of alloy can be significantly improved by the slight additions of Cu (e.g. 0–2 mass%) without altering either the microstructure or the tensile properties of alloy. On the contrary, alloy with higher addition of Cu, characterized by Cu-rich phases both at grain boundaries and inside the matrix, demonstrates lower corrosion resistance and lower tensile strength. Interestingly, corrosion resistance in grain boundary of alloy gradually increases with Cu content increasing irrespective of the appearance of Cu-rich phases.

中文翻译：

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Cu添加对Ni-30Co-16Cr-15Mo-6Fe合金腐蚀行为和拉伸性能的影响

摘要 研究了 Ni-30Co-16Cr-15Mo-6Fe-xCu（x = 0、0.5、2 和 6）（质量%）合金在 5.2 M 氢氟酸水溶液中的腐蚀行为和拉伸性能。在不改变合金的微观结构或拉伸性能的情况下，少量添加 Cu（例如 0-2 质量％）可以显着提高合金的耐腐蚀性。相反，具有较高Cu添加量的合金，在晶界和基体内部均具有富Cu相，表现出较低的耐腐蚀性和较低的抗拉强度。有趣的是，无论富铜相的出现如何，合金晶界的耐腐蚀性能随着铜含量的增加而逐渐增加。