Effects of grain size and Al-Mn phase on the corrosion performance of hot-rolled AZ31 magnesium alloy

IF 3.5 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Science Pub Date : 2024-11-14 DOI:10.1007/s10853-024-10396-y

Jinfeng Peng, Chunde Zhou, Daibo Zhu, Jianyun Mao, Xiangwu Xiao, Liang Su, Mao Pan, Hailin Liu, Bingchan Ren, Wenming Zhu

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Abstract

In this paper, the effects of multiple hot rolling on the microstructure and corrosion resistance were studied in detail, and the mechanism of structural evolution on corrosion resistance was explored for hot rolled AZ31 alloy. The multiple hot rolling can effectively refine the grain, thus improving the corrosion resistance of AZ31 alloy. The rolling process can break and refine the bulk Al-Mn phase to granular Al-Mn phase in AZ31 alloy. Employing quasi-in-situ scanning electron microscopy, it has been observed that the granular Al-Mn phase shows a notably decreased propensity to accelerate the corrosion of the proximal α-Mg matrix. Employing quasi-in-situ scanning electron microscopy, it was observed that the granular Al-Mn phase exhibits a significantly reduced tendency to accelerate the corrosion of the proximal α-Mg matrix. This observation is attributed to the reduced size of the Al-Mn phase, which effectively minimizes the potential difference with the matrix. Consequently, the cathodic effect of the Al-Mn phase in galvanic corrosion is diminished, resulting in a lower overall corrosion rate.

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晶粒尺寸和 Al-Mn 相对热轧 AZ31 镁合金腐蚀性能的影响

本文详细研究了多次热轧对显微组织和耐腐蚀性能的影响，并探讨了热轧 AZ31 合金结构演变对耐腐蚀性能的影响机理。多次热轧能有效细化晶粒，从而提高 AZ31 合金的耐腐蚀性。轧制过程可将 AZ31 合金中的块状铝锰相破碎并细化为粒状铝锰相。利用准原位扫描电子显微镜观察发现，颗粒状铝锰相明显降低了加速近端 α-Mg 基体腐蚀的倾向。利用准原位扫描电子显微镜观察发现，颗粒状铝锰相加速近端 α - 镁基体腐蚀的倾向明显降低。这一观察结果归因于铝锰相的尺寸减小，从而有效地减少了与基体之间的电位差。因此，铝锰相在电化学腐蚀中的阴极效应减弱，导致整体腐蚀速率降低。

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来源期刊

Journal of Materials Science 工程技术-材料科学：综合

CiteScore

7.90

自引率

4.40%

发文量

1297

审稿时长

2.4 months

期刊介绍： The Journal of Materials Science publishes reviews, full-length papers, and short Communications recording original research results on, or techniques for studying the relationship between structure, properties, and uses of materials. The subjects are seen from international and interdisciplinary perspectives covering areas including metals, ceramics, glasses, polymers, electrical materials, composite materials, fibers, nanostructured materials, nanocomposites, and biological and biomedical materials. The Journal of Materials Science is now firmly established as the leading source of primary communication for scientists investigating the structure and properties of all engineering materials.