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热处理对一种高强度Mg-Gd-Y-Zn-Zr合金耐蚀性的影响

Effect of Heat Treatments on the Corrosion Resistance of a High Strength Mg-Gd-Y-Zn-Zr Alloy.

作者信息

Xu Hang, Li Yuan, Wu Luoyi, Jiang Fulin, Fu Dingfa, Teng Jie, Zhang Hui

机构信息

Department of Materials Science and Engineering, Hunan University, Changsha 410082, China.

出版信息

Materials (Basel). 2022 Apr 12;15(8):2813. doi: 10.3390/ma15082813.

DOI:10.3390/ma15082813
PMID:35454505
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9025149/
Abstract

Magnesium-rare earth (Mg-Re) alloys are very promising structural materials in lightweight industries, while the poor corrosion resistance limits their widespread application. In this work, to provide insights into the functions of precipitate characteristics on the corrosion behaviors of Mg-Re alloys, the influence of heat treatments on the corrosion behavior of Mg-11.46Gd-4.08Y-2.09Zn-0.56Zr alloy was investigated via an immersion test, electrochemical experiment and scanning electron microscope (SEM). The results showed that the corrosion rate of Mg-11.46Gd-4.08Y-2.09Zn-0.56Zr alloy specimens decreased by 17.58% and 20.44% after T5 and T6 heat treatment, respectively. In the heat-treated specimens, the corrosion did not extend further into the matrix but formed fine corrosion grooves along the extrusion direction. The improved homogeneity reduced the residual stress and the ' precipitate introduced as a corrosion barrier after T5 and T6 heat treatment reduced the corrosion rate of the studied Mg alloy. In addition, the volume fraction of the long-period stacking-ordered (LPSO) phase decreased after heat treatment, which effectively reduced galvanic corrosion and enhanced the protective effect on the Mg matrix.

摘要

镁稀土（Mg-Re）合金是轻量化工业中非常有前景的结构材料，但其耐腐蚀性较差限制了它们的广泛应用。在这项工作中，为了深入了解析出相特征对Mg-Re合金腐蚀行为的影响，通过浸泡试验、电化学实验和扫描电子显微镜（SEM）研究了热处理对Mg-11.46Gd-4.08Y-2.09Zn-0.56Zr合金腐蚀行为的影响。结果表明，Mg-11.46Gd-4.08Y-2.09Zn-0.56Zr合金试样在T5和T6热处理后，腐蚀速率分别降低了17.58%和20.44%。在热处理后的试样中，腐蚀没有进一步深入基体，而是沿挤压方向形成了细小的腐蚀沟槽。均匀性的改善降低了残余应力，T5和T6热处理后作为腐蚀阻挡层引入的析出相降低了所研究镁合金的腐蚀速率。此外，热处理后长周期有序堆积（LPSO）相的体积分数降低，有效减少了电偶腐蚀，增强了对镁基体的保护作用。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c72d/9025149/3230dff8e225/materials-15-02813-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c72d/9025149/c5beb2d6b55d/materials-15-02813-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c72d/9025149/5bbabfe3d9ee/materials-15-02813-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c72d/9025149/971e893daa43/materials-15-02813-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c72d/9025149/f1f5ccad91ef/materials-15-02813-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c72d/9025149/a4b99fc1c708/materials-15-02813-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c72d/9025149/9515b7546afb/materials-15-02813-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c72d/9025149/3230dff8e225/materials-15-02813-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c72d/9025149/c5beb2d6b55d/materials-15-02813-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c72d/9025149/5bbabfe3d9ee/materials-15-02813-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c72d/9025149/971e893daa43/materials-15-02813-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c72d/9025149/f1f5ccad91ef/materials-15-02813-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c72d/9025149/a4b99fc1c708/materials-15-02813-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c72d/9025149/9515b7546afb/materials-15-02813-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c72d/9025149/3230dff8e225/materials-15-02813-g007.jpg

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