Corrosion Behavior of ZK60 Magnesium Alloy in Sodium Halide Solutions

doi:10.11902/1005.4537.2015.038

Journal of Chinese Society for Corrosion and protection

2015, Vol. 35

Issue (3): 245-250 DOI: 10.11902/1005.4537.2015.038

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Corrosion Behavior of ZK60 Magnesium Alloy in Sodium Halide Solutions

Hongyan XU(

),Jiangtao DIWU,Xia LIU,Yaqin YANG

School of Materials Science and Engineering, North University of China, Taiyuan 030051, China

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Abstract

The corrosion behavior of ZK60 magnesium alloy in 3.5% sodium halides NaX (X=F, Cl, Br and I) solutions was studied by means of static immersion methods, potentiodynamic polarization measurement and SEM observation. The results showed that, the open circuit potential (OCP) of ZK60 alloy in 3.5% sodium halides solutions increased first and then became flat to a steady state. The corrosion behavior of ZK60 alloy was related to the halogen ions in the solutions: i.e. it was passivated in 3.5%NaF solution, while it was corroded in 3.5%NaCl, 3.5%NaBr and 3.5%NaI solutions and its corrosion rate decreased with immersion time, which may be ascribed to the formed protective corrosion products with the increasing pH value of the solutions.

Key words: ZK60 magnesium alloy corrosion sodium halide solution

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	Hongyan XU
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Hongyan XU,Jiangtao DIWU,Xia LIU,Yaqin YANG. Corrosion Behavior of ZK60 Magnesium Alloy in Sodium Halide Solutions. Journal of Chinese Society for Corrosion and protection, 2015, 35(3): 245-250.

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https://www.jcscp.org/EN/10.11902/1005.4537.2015.038 OR https://www.jcscp.org/EN/Y2015/V35/I3/245

Fig.1 Time dependences open circuit potential (OCP) of ZK60 alloy in 3.5%NaF solution (a) and 3.5%NaCl,3.5%NaBr and 3.5%NaI solutions (b)

Fig.2 XRD patterns of ZK60 alloy after immersed in 3.5%NaF solution for 10, 30, 60 and 120 min (a), and the magnified image of square area in Fig.2a (b)

Fig.3 Potentiodynamic polarization curves of ZK60 alloy after immersion for 10 and 60 min in 3.5%NaF (a), 3.5% NaCl (b), 3.5%NaBr (c) and 3.5%NaI (d) solutions

Table 1 Corrosion potential (E_corr) and corrosion current density (I_corr) of ZK60 alloy immersed in different halide solutions for different time

Fig.4 pH values of 3.5% sodium halide solutions as a function of immersion time of ZK60 alloy

Fig.5 SEM images of ZK60 alloy after immersion in 3.5%NaF (a), 3.5%NaCl (b), 3.5%NaBr (c) and 3.5%NaI (d) solutions for 48 h

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