期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 98, 期 -, 页码 63-68出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2018.11.009
关键词
High-entropy alloys; Refractory alloys; Solid solution; Corrosion; Passivity
资金
- National Natural Science Foundation of China [51504104]
- Natural Science Foundation of Jiangxi Province, China [20161BAB206141]
- Areas of Advance Materials Science from Chalmers University of Technology
The Hf0.5Nb0.5Ta0.5Ti1.5Zr 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 Hf0.5Nb0.5Ta0.5Ti1.5Zr reaches an unusually high value of +8.36 V, much higher than that of reported high-entropy alloys. The superior passivity of Hf0.5Nb0.5Ta0.5Ti1.5Zr 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.
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