Effect of Self-generated Magnetic Field Produced by Electric Current on Atmospheric Corrosion Behavior of Copper

doi:10.11902/1005.4537.2024.211

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (4): 956-964 DOI: 10.11902/1005.4537.2024.211

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Effect of Self-generated Magnetic Field Produced by Electric Current on Atmospheric Corrosion Behavior of Copper

LI Qiubo, SU Yizhe, WU Wei(

), ZHANG Junxi(

)

Shanghai Key Laboratory of Material Protection and Advanced Material in Electric Power, Shanghai University of Electric Power, Shanghai 200090, China

Cite this article:

LI Qiubo, SU Yizhe, WU Wei, ZHANG Junxi. Effect of Self-generated Magnetic Field Produced by Electric Current on Atmospheric Corrosion Behavior of Copper. Journal of Chinese Society for Corrosion and protection, 2025, 45(4): 956-964.

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Abstract

The effect of self-generated magnetic field produced by electric current on the corrosion behavior of Cu in simulated marine atmospheric environments was studied via a novel lab-made electrochemical test set, which consists of that a current-carrying copper conductor is covered with T2 pure Cu foil, and a thin electrolyte layer (TEL) on top of the Cu foil. The surface morphology and composition of the corrosion products were characterized by using scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy techniques. The results showed that with the increasing intensity of the self-generated magnetic field, both the cathodic and anodic processes of the copper were accelerated, jointly leading to an increase in the corrosion rate. During long term corrosion exposure, the composition of the corrosion products on the copper surface changes with the increasing intensity of the self-generated magnetic field, while weakening its protective ability for the subsequent corrosion of Cu substrate, thus, pitting corrosion occurs on the Cu surface. At the same time, it is found that the corrosion degree of the Cu surface is closely related to the direction of the electric current and locations of the test piece, namely where the current input the corrosion degree is higher than that the current output. Herewith, the influence mechanism of the self-generated magnetic field on the atmospheric corrosion of Cu is further discussed.

Key words: copper thin electrolyte layer atmospheric corrosion self-generated magnetic field

Received: 15 July 2024 32134.14.1005.4537.2024.211

ZTFLH:

TG172

Fund: National Natural Science Foundation of China(52171074)

Corresponding Authors: WU Wei, E-mail: wuweicorr@shiep.edu.cn;
ZHANG Junxi, E-mail: zhangjunxi@shiep.edu.cn

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	LI Qiubo
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	WU Wei
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https://www.jcscp.org/EN/10.11902/1005.4537.2024.211 OR https://www.jcscp.org/EN/Y2025/V45/I4/956

Fig.1 Schematic diagrams of the electrochemical measurement apparatus under thin electrolyte (a) and the cross-section of work electrode (b)

Fig.2 Comparison of magnetic field distributions on the surface of copper under operating condition (a) and simulated condition (b)

Fig.3 Nyquist plots (a) and Bode plots (b) of copper under thin electrolyte layers with different thicknesses at +50 mV (vs. OCP)

Fig.4 Weak polarization curves (a) and fitting parameters (b) of copper foil under 40 μm TEL at different self-generated magnetic field levels

Fig.5 Surface morphologies of the copper foil after exposure for 3 d under TEL at different self-generated magnetic field levels: (a) input end, 0 mT, (b) output end, 0 mT, (c) input end, 3 mT, (d) output end, 3 mT, (e) input end, 5.7 mT, (f) output end, 5.7 mT

Fig.6 Surface morphologies of copper foil after 7 d exposure under TEL at different self-generated magnetic field levels: (a) input end, 0 mT, (b) output end, 0 mT, (c) input end, 3 mT, (d) output end, 3 mT, (e) input end, 5.7 mT, (f) output end, 5.7 mT

Fig.7 XRD patterns of copper foil exposed for 7 d under TEL condition at different self-generated magnetic field levels

Fig.8 XPS fine spectra of Cu 2p_3/2 of the corrosion films formed on copper foil exposed for 7 d at different self-generated magnetic field levels: (a) 0 mT input end, (b) 0 mT output end, (c) 5.7 mT input end, (d) 5.7 mT output end

Fig.9 XPS fine spectra of O 1s of the corrosion product films formed on copper foil exposed for 7 d at different self-generated magnetic field levels: (a) 0 mT input end, (b) 0 mT output end, (c) 5.7 mT input end, (d) 5.7 mT output end

Fig.10 Proportion of Cu (a, b) and O (c, d) with different valence states in the corrosion film on Cu foil after exposure under TEL for 7 d at 0 mT (a, c) and 5.7 mT (b, d)

Fig.11 Schematic diagrams of distributions of CuCl $2 -$ and O₂ species on copper soil under the conditions of unapplied (a) and applied (b) self-generated magnetic field

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