Influence of Magnetic Field on Corrosion Behavior of Al-Mg Alloys with Different Mg Content

doi:10.11902/1005.4537.2020.236

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (5): 633-638 DOI: 10.11902/1005.4537.2020.236

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Influence of Magnetic Field on Corrosion Behavior of Al-Mg Alloys with Different Mg Content

YANG Guangheng, ZHOU Zehua(

), ZHANG Xin(

), WU Lintao, MEI Wan

College of Mechanics and Materials, Hohai University, Nanjing 211100, China

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Abstract

The influence of magnetic field on the corrosion behavior of Al-Mg alloys with different Mg content in 3.5%NaCl solutions was characterized by electrochemical workstation, scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). The NaCl solution was magnetized in desired magnetic fields in order to reveal the effect of magnetic field on the properties of the solution and the corrosion performance of Al-Mg alloys. The difference between the effect of magnetic field on charged particles and solution properties during the corrosion process of Al-Mg alloys was also investigated. It was found that the pH and conductivity of the solution increased by the action of magnetic field, which led to the increase of corrosion rate of the alloys, meanwhile, paramagnetic particles are gathered on the alloy surface to inhibit the further development of corrosion of Al-Mg alloys. Therefore, the compition of the above two processes resulted in the decrease of corrosion rate of the alloys, which may be ascribed to that the effect of magnetic field on charged particles is greater than that of pH and conductivity of the solution.

Key words: magnetic field Al-Mg alloy corrosion resistance magnetization treatment

Received: 16 November 2020

ZTFLH:

TG146.21

Fund: National Natural Science Foundation of China(51909071);Fundamental Research Funds for the Central Universities(B200202133);Natural Science Foundation of Jiangsu Province(BK20190493)

Corresponding Authors: ZHOU Zehua,ZHANG Xin E-mail: zhouzehua@hhu.edu.cn;zhangxin.007@163.com

About author: ZHANG Xin, E-mail: zhangxin.007@163.com
ZHOU Zehua, E-mail: zhouzehua@hhu.edu.cn

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Cite this article:

YANG Guangheng, ZHOU Zehua, ZHANG Xin, WU Lintao, MEI Wan. Influence of Magnetic Field on Corrosion Behavior of Al-Mg Alloys with Different Mg Content. Journal of Chinese Society for Corrosion and protection, 2021, 41(5): 633-638.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2020.236 OR https://www.jcscp.org/EN/Y2021/V41/I5/633

Fig.1 Magnetic field processing device

Fig.2 Surface micromorphologies of Al-xMg alloys (x=0 (a), 1.5 (b), 3.0 (c), 5.0 (d), 8.0% (e)) after 48 h immersion in 3.5%NaCl solution under the conditions of 0 (a1~e1) and 0.4 T (a2~e2)

Fig.3 SEM image (a) EDS analysis result (b) of Al-3.0Mg alloy after corrosion in 3.5%NaCl solution without magnetic field for 48 h

Fig.4 Potentiodynamic polarization curves of Al (a) and Al-1.5Mg (b), Al-3.0Mg (c), Al-5.0Mg (d) and Al-8.0Mg (e) alloys in 3.5%NaCl solution under the magnetic field intensities of 0 and 0.4 T

Table 1 E_corr, I_corr, E_pit values derived from the polarization curves for Al-Mg alloys

Fig.5 Variations of pH and conductivity of 3.5%NaCl solution during and after the magnetic field treatment at 0.4 T

Fig.6 Potentiodynamic polarization curves (a, c), Nyquist diagrams (b, d) and impedance module of Al-3.0%Mg alloy in untreated and treated solutions at the magnetic field intensity of 0 T (a, b) and 0.4 T (c, d)

Table 2 E_corr, I_corr values and fitting equivalent elements parameters of Al-3.0%Mg alloy in untreated and treated solutions under the condition of magnetic field free

Table 3 E_corr, I_corr values and fitting equivalent elements parameters of Al-3.0%Mg alloy in untreated and treated NaCl solutions at the magnetic field intensity of 0.4 T

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