The effects of magnetic field on anodic dissolution and passivation of iron in a sulfuric acid solution with chlorides are investigated by electrochemical measurements and surface observations. In the anodic potentiodynamic polarization curve, the potential for the drastic current drop is not significantly affected by the potential sweep rate under 0 T, which moves in the negative direction with increasing potential sweep rate under 0.4 T magnetic field that is parallel to the working electrode surface. The uneven surface produced during the potentiodynamic polarization hinders the transition from active dissolution to passivation. The area fraction of the locally accelerated dissolution increases with prolonging polarization time at high potentials where the surface film precipitation-dissolution process is the rate-determining step for metal dissolution. Pretreatment under potentiostatic polarization at 0.4 T magnetic field produces an uneven surface that would result in unrecoverable electrochemical states after switching from 0.4 T to 0 T, depending on the applied potential. The positive-feedback mechanism for the magnetic field effect and the surface morphological effect is proposed. The results demonstrate the direct magnetohydrodynamic effect and its resultant uneven surface on the anodic behavior of iron.
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1 June 2020
SCIENCE SECTION|
March 01 2020
Effects of Magnetic Field on Uneven Dissolution of Iron in Sulfuric Acid Solution with Chlorides
Hongjuan Li;
Hongjuan Li
*Institute of Materials, School of Materials Science and Engineering, Shanghai University, 149 Yanchang Road P.O. Box.269, Shanghai 200072, China.
**State Key Laboratory of Advanced Special Steel, Shanghai University, 381 Nancheng Road, Shanghai 200444, China.
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Fei Ning;
Fei Ning
*Institute of Materials, School of Materials Science and Engineering, Shanghai University, 149 Yanchang Road P.O. Box.269, Shanghai 200072, China.
**State Key Laboratory of Advanced Special Steel, Shanghai University, 381 Nancheng Road, Shanghai 200444, China.
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Haiying Dong;
Haiying Dong
*Institute of Materials, School of Materials Science and Engineering, Shanghai University, 149 Yanchang Road P.O. Box.269, Shanghai 200072, China.
**State Key Laboratory of Advanced Special Steel, Shanghai University, 381 Nancheng Road, Shanghai 200444, China.
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Kun Zhang;
Kun Zhang
*Institute of Materials, School of Materials Science and Engineering, Shanghai University, 149 Yanchang Road P.O. Box.269, Shanghai 200072, China.
**State Key Laboratory of Advanced Special Steel, Shanghai University, 381 Nancheng Road, Shanghai 200444, China.
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Zhanpeng Lu;
Zhanpeng Lu
‡
*Institute of Materials, School of Materials Science and Engineering, Shanghai University, 149 Yanchang Road P.O. Box.269, Shanghai 200072, China.
**State Key Laboratory of Advanced Special Steel, Shanghai University, 381 Nancheng Road, Shanghai 200444, China.
‡Corresponding author. E-mail: [email protected].
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Yuanjie Tang;
Yuanjie Tang
*Institute of Materials, School of Materials Science and Engineering, Shanghai University, 149 Yanchang Road P.O. Box.269, Shanghai 200072, China.
**State Key Laboratory of Advanced Special Steel, Shanghai University, 381 Nancheng Road, Shanghai 200444, China.
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Shuangwei Cai;
Shuangwei Cai
*Institute of Materials, School of Materials Science and Engineering, Shanghai University, 149 Yanchang Road P.O. Box.269, Shanghai 200072, China.
**State Key Laboratory of Advanced Special Steel, Shanghai University, 381 Nancheng Road, Shanghai 200444, China.
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Tongming Cui;
Tongming Cui
*Institute of Materials, School of Materials Science and Engineering, Shanghai University, 149 Yanchang Road P.O. Box.269, Shanghai 200072, China.
**State Key Laboratory of Advanced Special Steel, Shanghai University, 381 Nancheng Road, Shanghai 200444, China.
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Jiarong Ma;
Jiarong Ma
*Institute of Materials, School of Materials Science and Engineering, Shanghai University, 149 Yanchang Road P.O. Box.269, Shanghai 200072, China.
**State Key Laboratory of Advanced Special Steel, Shanghai University, 381 Nancheng Road, Shanghai 200444, China.
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Xinhe Xu;
Xinhe Xu
*Institute of Materials, School of Materials Science and Engineering, Shanghai University, 149 Yanchang Road P.O. Box.269, Shanghai 200072, China.
**State Key Laboratory of Advanced Special Steel, Shanghai University, 381 Nancheng Road, Shanghai 200444, China.
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Sichun Ling
Sichun Ling
*Institute of Materials, School of Materials Science and Engineering, Shanghai University, 149 Yanchang Road P.O. Box.269, Shanghai 200072, China.
**State Key Laboratory of Advanced Special Steel, Shanghai University, 381 Nancheng Road, Shanghai 200444, China.
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CORROSION (2020) 76 (6): 528–538.
Article history
Received:
December 22 2019
Revision Received:
March 01 2020
Accepted:
March 01 2020
Citation
Hongjuan Li, Fei Ning, Haiying Dong, Kun Zhang, Zhanpeng Lu, Yuanjie Tang, Shuangwei Cai, Tongming Cui, Jiarong Ma, Xinhe Xu, Sichun Ling; Effects of Magnetic Field on Uneven Dissolution of Iron in Sulfuric Acid Solution with Chlorides. CORROSION 1 June 2020; 76 (6): 528–538. doi: https://doi.org/10.5006/3478
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