Effect of Structural Stability on Electrochemical Corrosion Properties of Zr-based Amorphous Alloy

doi:10.11902/1005.4537.2020.245

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (1): 79-84 DOI: 10.11902/1005.4537.2020.245

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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 T_g) 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 T_g and T_x) 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.

Key words: Zr-based amorphous anneal structural relaxation nanocrystal electrochemical property

Received: 30 November 2020

ZTFLH:

TG174

Fund: Fundamental Research Funds for the Central Universities(N170708019)

Corresponding Authors: YUAN Guo E-mail: yuanguoral@sina.com

About author: YUAN Guo, E-mail: yuanguoral@sina.com

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	Zhu YAN
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	Yuanxiang ZHANG
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	Yang WANG
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Cite this article:

YAN Zhu, ZHANG Chenyang, WANG Lixin, YUAN Guo, ZHANG Yuanxiang, FANG Feng, WANG Yang, KANG Jian. Effect of Structural Stability on Electrochemical Corrosion Properties of Zr-based Amorphous Alloy. Journal of Chinese Society for Corrosion and protection, 2022, 42(1): 79-84.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2020.245 OR https://www.jcscp.org/EN/Y2022/V42/I1/79

Fig.1 XRD patterns of as-cast and annealed samples of Zr₅₅Cu₃₀Al₁₀Ni₅

Fig.2 DSC curves of Zr₅₅Cu₃₀Al₁₀Ni₅ as-cast and annealed samples (heating rate is 20 K/min)

Fig.3 Relaxation enthalpy of Zr₅₅Cu₃₀Al₁₀Ni₅ as-cast and annealed samples before T_g point

Fig.4 Potentiodynamic polarization curves of Zr₅₅Cu₃₀Al₁₀Ni₅ as-cast and annealed samples in 3.5%NaCl solution

Table 1 Fitting results of polarization curves for Zr₅₅Cu₃₀Al₁₀Ni₅ as-cast and annealed amorphous alloys in 3.5%NaCl solution

Fig.5 EIS results of the Zr₅₅Cu₃₀Al₁₀Ni₅ as-cast and annealed amorphous alloys in 3.5%NaCl solution: (a) Nyquist plot, (b) Bode plot, (c) Phase plot

Fig.6 Equivalent circuit of Zr₅₅Cu₃₀Al₁₀Ni₅ amorphous alloy in 3.5%NaCl solution

Table 2 EIS fitting results of Zr₅₅Cu₃₀Al₁₀Ni₅ as-cast and annealed amorphous alloys in 3.5%NaCl solution

Fig.7 SEM images of Zr₅₅Cu₃₀Al₁₀Ni₅ as-cast and annealed samples corroded surface after polarization in 3.5%NaCl solution: (a) as-cast sample, (b) 653 K annealed sample, (c) 693 K annealed sample, (d) 723 K annealed sample

Fig.8 TEM images of Zr₅₅Cu₃₀Al₁₀Ni₅ as-cast (a, b) and 693 K annealed samples (c, d)

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