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

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China Pub Date : 2024-09-01 DOI:10.1016/S1003-6326(24)66579-9

Kai-xuan FENG , Tao LAI , Yang CHEN , Zheng YIN , Zhi-qin WU , Hong YAN , Hong-gun SONG , Chao LUO , Zhi HU

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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.

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镁-(7,9)铝-1Fe-xNd 合金的微电镀腐蚀行为

通过电化学控制下的原位观察和电解质环境中的原位原子力显微镜（AFM），研究了镁-(7,9)铝-1Fe-xNd 合金的局部微电化学腐蚀过程和动力学信息。结果表明，合金中富钕相的形成导致伏特电位差从 ~400 mV（AlFe3/α-Mg）降至 ~220 mV（富钕/α-Mg），从而减少了阴极相周围的腐蚀产物和微尺度区域的腐蚀电流密度。Nd 的加入大大提高了耐腐蚀性，主要原因是抑制了第二相与基体之间的微电蚀作用。最后，根据现场观察和电化学结果讨论了 Mg-(7,9)Al-1Fe-xNd 合金的腐蚀机理。

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.