The Nonferrous Metals Society of China

Transactions of Nonferrous Metals Society of China >

2024 , Vol. 34 >Issue 9: 2828 - 2848

DOI: https://doi.org/10.1016/S1003-6326(24)66579-9

Materials Science and Engineering

Micro-galvanic corrosion behaviour of Mg-(7,9)Al-1Fe-xNd alloys

  • 冯开轩，赖 涛，陈 扬，殷 正，吴志勤，闫 洪，宋红滚，罗 超，胡 志
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  • 1. School of Advanced Manufacturing, Nanchang University, Nanchang 330031, China;
    2. Institute for Advanced Study, Nanchang University, Nanchang 330031, China

Online published: 2025-11-04

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Abstract

The localized micro-galvanic corrosion process and the kinetic information of Mg-(7,9)Al-1Fe-xNd alloys were investigated by in situ observation under electrochemical control and in situ atomic force microscopy (AFM) in an electrolyte environment. The results revealed that the formation of the Nd-rich phase in alloys resulted in a decrease in the Volta potential difference from ~400 mV (AlFe3/α-Mg) to ~220 mV (Nd-rich/α-Mg), reducing the corrosion products around the cathodic phase and corrosion current density of the microscale area. The addition of Nd significantly improved the corrosion resistance, mainly due to the suppression of the micro-galvanic corrosion between the second phases and substrate. Finally, the corrosion mechanism of Mg-(7,9)Al-1Fe-xNd alloys was discussed based on in situ observations and electrochemical results.

Key words： magnesium alloy; scanning Kelvin probe force microscope; micro-galvanic corrosion; in situ observation; atomic force microscopy

Cite this article

冯开轩，赖 涛，陈 扬，殷 正，吴志勤，闫 洪，宋红滚，罗 超，胡 志 . Micro-galvanic corrosion behaviour of Mg-(7,9)Al-1Fe-xNd alloys[J]. Transactions of Nonferrous Metals Society of China, 2024 , 34(9) : 2828 -2848 . DOI: 10.1016/S1003-6326(24)66579-9

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