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Effect of Structural Stability on Electrochemical Corrosion Properties of Zr-based Amorphous Alloy |
YAN Zhu, ZHANG Chenyang, WANG Lixin, YUAN Guo( ), ZHANG Yuanxiang, FANG Feng, WANG Yang, KANG Jian |
School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China |
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Abstract Zr55Cu30Al10Ni5 amorphous alloy with high energy state and high free volume content was prepared by twin-roll rolling method. Then the effect of structural stability on the electrochemical properties of the prepared amorphous alloy in 3.5% (mass fraction) NaCl solution was studied. The results show that the free volume of the annealed alloy is smaller than that of the as-cast one, while the former one suffered from pitting corrosion during the potentiodynamic polarization test. The size and number of the electrochemical corrosion test induced corrosion pits are reduced on the surface of the alloy annealed in vacuum at 653 K (lower than Tg) for 30 min. The size of corrosion pits become smaller and the number of pits increases for the alloy annealed at 693 and 723 K (between Tg and Tx) respectively. The nano-crystallites formed in the amorphous alloy may increase its pitting sensitivity, the decrease of free volume in the matrix may hinder the further propagation of corrosion pits. This study shows that the amorphous alloy strip with high energy and high free volume content prepared by Twin-roll rolling method is prone to suffer from corrosion, whereas, the annealing below the crystallization temperature can reduce its free volume content and thus improve its corrosion performance.
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Received: 30 November 2020
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Fund: Fundamental Research Funds for the Central Universities(N170708019) |
Corresponding Authors:
YUAN Guo
E-mail: yuanguoral@sina.com
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About author: YUAN Guo, E-mail: yuanguoral@sina.com
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