The Hf_0.5Nb_0.5Ta_0.5Ti_1.5Zr refractory high-entropy alloy with excellent corrosion resistance in the 3.5 wt% NaCl solution is identified in this work. This refractory high-entropy alloy exhibits much better general corrosion resistance than that of the 316L stainless steel, due to its corrosion current density being about one fifth of that in the latter. Meanwhile, the pitting potential of Hf_0.5Nb_0.5Ta_0.5Ti_1.5Zr reaches an unusually high value of +8.36 V, much higher than that of reported high-entropy alloys. The superior passivity of Hf_0.5Nb_0.5Ta_0.5Ti_1.5Zr is accredited to the formation of a single-phase solid solution containing high amount of homogenously distributed passivity-promoting elements, and also the existence of metallic Ta and OH⁻ species in the passive film, which contribute to the high immunity to passive film breakdown.

在这项工作中，我们发现了Hf _0.5 Nb _0.5 Ta _0.5 Ti _1.5 Zr难熔高熵合金，在3.5 wt％NaCl溶液中具有出色的耐腐蚀性。由于该耐火高熵合金的腐蚀电流密度约为后者的五分之一，因此它比316L不锈钢具有更好的综合耐腐蚀性。同时，Hf _0.5 Nb _0.5 Ta _0.5 Ti _1.5 Zr的点蚀电位达到+8.36 V的异常高的值，远高于报道的高熵合金。Hf _0.5 Nb _0.5 Ta _0.5 Ti的优异钝化_1.5的Zr被认可的含有高量均匀地分布被动促进元素，并且也金属Ta的存在的单相固溶体的形成和OH ^-中的钝化膜，这有助于高免疫力钝化膜物种分解。