Acceleration or retardation by a magnetic field of the anodic processes of iron in molybdate-bearing chloride solutions

Haiying Dong; Hongjuan Li; Yiqi Tao; Hetian Chen; Xin Li; Juan Wang; Zhanpeng Lu; Tongming Cui; Junjie Chen; Xinghe Xu; Deng Pan

doi:10.1039/d3ra05489f

Acceleration or retardation by a magnetic field of the anodic processes of iron in molybdate-bearing chloride solutions

RSC Adv. 2024 Jan 3;14(2):1258-1266. doi: 10.1039/d3ra05489f. eCollection 2024 Jan 2.

Authors

Haiying Dong^{1

2}, Hongjuan Li^{1

2}, Yiqi Tao^{1

2}, Hetian Chen³, Xin Li^{1

2}, Juan Wang^{1

2}, Zhanpeng Lu^{1

2

4}, Tongming Cui^{1

2}, Junjie Chen^{1

2}, Xinghe Xu^{1

2}, Deng Pan^{1

2}

Affiliations

¹ Institute of Materials, School of Materials Science and Engineering, Shanghai University Shanghai 200072 China zplu@t.shu.edu.cn.
² State Key Laboratory for Advanced Special Steels Shanghai 200072 China.
³ School of Materials Science and Engineering, University of New South Wales (UNSW Sydney) Sydney 2052 Australia.
⁴ Jiangsu Yihai New Energy Materials Co. Ltd Jiangsu 214231 China.

Abstract

The modulation by a horizontal magnetic field of the anodic processes of iron in molybdate-bearing chloride solutions is determined. The magnetic field can accelerate or retard the anodic reaction depending on the rate-controlling steps at specified electrode potentials. The anodic current density arising from uniform dissolution from open or semi-open pits is increased by the magnetic field. The current density originating from occluded pits can be decreased by the magnetic field, where autocatalysis has a dominant effect on the pitting rate. The effect of the magnetic field on the pitting corrosion is a combination of the influence on electrochemical reactions at the interfaces of the pits and the disturbance of the autocatalysis process inside the pit enclave through the magnetohydrodynamic (MHD) effect. Micro-MHD effects for specific locations and macro-MHD effects for pitting systems are recommended to illustrate the magnetic effect on localized corrosion phenomena at various combinations of potentials and solution compositions.