In this study, a novel Cu-based (Cu₅₅Al₂₀Ni₁₂Ti₈Si₅, at.%) medium-entropy alloy (MEA) coating was prepared by high-velocity oxygen-fuel (HVOF) spraying technology. Thermo-Calc was employed to simulate the phase diagram of the alloy system. Phase composition and microstructure of the as-sprayed coating were characterized by means of XRD, FESEM, TEM and STEM/EDX. The effect of sulfate-reducing bacteria (SRB) on the corrosion behavior of the coating and the as-cast Ni-Al bronze (NAB) was investigated using electrochemical measurements and surface characterization. The Thermo-Cala simulation results showed that the alloy system presented a single BCC solid solution phase, while the detailed characterization of microstructure indicated that a few NiTi-rich B2-ordered precipitates could be also found in the as-sprayed coating other than the Cu-rich BCC matrix. Electrochemical studies illustrated that the coating exhibited superior corrosion resistance than the NAB in SRB medium, the corrosion acceleration efficiency induced by SRB of the NAB (95.3 %) was more severe than that of the coating (63.8 %). Surface analysis results demonstrated the occurrence of pitting corrosion and the formation of Cu₂S on the coating surface after corroded in SRB medium. Corrosive metabolite HS^- induced microbiologically influenced corrosion was considered as the main corrosion acceleration mechanism caused by SRB.

在这项研究中，采用高速氧燃料（HVOF）喷涂技术制备了一种新型铜基（Cu ₅₅ Al ₂₀ Ni ₁₂ Ti ₈ Si _{5 ，at.%）中熵合金（MEA）涂层。}采用 Thermo-Calc 模拟合金体系的相图。通过 XRD、FESEM、TEM 和 STEM/EDX 对喷涂涂层的物相组成和微观结构进行了表征。使用电化学测量和表面表征研究了硫酸盐还原菌（SRB）对涂层和铸态镍铝青铜（NAB）腐蚀行为的影响。Thermo-Cala模拟结果表明，合金体系呈现出单一的BCC固溶体相，而微观结构的详细表征表明，除了Cu之外，在喷涂涂层中还发现了一些富含NiTi的B2有序析出物。 -丰富的BCC矩阵。电化学研究表明，涂层在SRB介质中表现出优于NAB的耐腐蚀性能，NAB的SRB诱导腐蚀加速效率（95.3％）比涂层（63.8％）更严重。表面分析结果表明，在SRB介质中腐蚀后，涂层表面发生点蚀并形成Cu _{2 S。}腐蚀代谢物HS^引起的微生物影响腐蚀被认为是SRB引起的主要腐蚀加速机制。