Corrosion and Serration Behaviors of TiZr0.5NbCr0.5VxMoy High Entropy Alloys in Aqueous Environments

Metals

Jiemin Li¹  Xiao Yang¹  Ruanli Zhu²  Yong Zhang¹ 

[1] State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Xueyuan Road 30#, Beijing 100083, China; E-Mail:;Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Xueyuan Road 30#, Beijing 100083, China; E-Mail:

关键词: high-entropy alloy;    potentiodynamic polarization;    immersion test;    electrochemical noise;    serration behavior;   

DOI  :  10.3390/met4040597

来源: mdpi

【 摘 要 】

The corrosion and serration behaviors of TiZr_0.5NbCr_0.5, TiZr_0.5NbCr_0.5V and TiZr_0.5NbCr_0.5Mo high entropy alloys (HEAs) in NaCl and H₂SO₄ solutions were studied by potentiodynamic polarizations (PP) and immersion tests. The results show that all the alloys display excellent corrosion resistance no matter in NaCl solution or in H₂SO₄ solution. The additions of V and Mo increase the pitting corrosion resistance for the three alloys in NaCl solution slightly and greatly improve the corrosion resistance in H₂SO₄ solution. The corrosion behaviors of TiZr_0.5NbCr_0.5 and TiZr_0.5NbCr_0.5Mo alloys are more sensitive to temperature than that of TiZr_0.5NbCr_0.5V alloy. After immersion, the surface of TiZr_0.5NbCr_0.5 alloy appears some pitting holes, this may be related to the electrochemical noise and serration behavior on PP curves; localized corrosion initiates mainly on the boundaries of the BCC and Cr₂Zr Laves phase for TiZr_0.5NbCr_0.5V alloy; while for the TiZr_0.5NbCr_0.5Mo alloy, the dendrites with Mo element rich region exhibit poor corrosion resistance.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.