Corrosion behavior of Hf0.5 Nb0.5 Ta0.5 Ti1.5 Zr refractory high-entropy in aqueous chloride solutions
Journal article, 2019

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.

Corrosion

Refractory alloys

Passivity

Solid solution

High-entropy alloys

Author

Qiongyu Zhou

Foshan University

Saad Ahmed Sheikh

Chalmers, Industrial and Materials Science, Materials and manufacture

Ping Ou

Jiangxi University of Science and Technology

Dongchu Chen

Foshan University

Q. Hu

Jiangxi Academy of Sciences

Sheng Guo

Chalmers, Industrial and Materials Science, Materials and manufacture

Electrochemistry Communications

1388-2481 (ISSN)

Vol. 98 63-68

Subject Categories

Other Chemistry Topics

Metallurgy and Metallic Materials

Corrosion Engineering

DOI

10.1016/j.elecom.2018.11.009

More information

Latest update

12/18/2018