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镁对连续热镀锌Zn-Mg镀层微观结构及耐蚀性的影响

Effect of Mg on the Microstructure and Corrosion Resistance of the Continuously Hot-Dip Galvanizing Zn-Mg Coating.

作者信息

Dong Anping, Li Baoping, Lu Yanling, Zhu Guoliang, Xing Hui, Shu Da, Sun Baode, Wang Jun

机构信息

School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming, Shanghai 200240, China.

出版信息

Materials (Basel). 2017 Aug 22;10(8):980. doi: 10.3390/ma10080980.

DOI:10.3390/ma10080980
PMID:28829393
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5578346/
Abstract

The microstructure of continuously hot-dip galvanizing Zn-Mg coating was investigated in order to obtain the mechanism of the effects of Mg on the corrosion resistance. In this paper, the vertical section of the Zn-0.20 wt % Al-Mg ternary phase diagram near the Al-low corner was calculated. The results indicates that the phase composition of the Zn-0.20 wt % Al-Mg ternary phase diagram near the Al-low corner is the same as Zn-Mg binary phase diagram, suggesting Al in the Zn-Mg (ZM) coatings mainly concentrates on the interfacial layer between the coating and steel substrate. The microstructure of continuously hot-dip galvanizing ZM coatings with 0.20 wt % Al containing 1.0-3.0 wt % Mg was investigated using tunneling electron microscopy (TEM). The morphology of Zn in the coating changes from bulk to strip and finally to mesh-like, and the MgZn₂ changes from rod-like to mesh-like with the Mg content increasing. Al in the ZM coatings mainly segregates at the Fe₂Al₅ inhibition layer and the Mg added to the Zn bath makes this inhibition layer thinner and uneven. Compared to GI coating, the time of the first red rust appears increases by more than two-fold and expansion rate of red rust reduces by more than four-fold in terms of salt spray experiment. The ZM coating containing 2.0 wt % Mg has the best corrosion resistance. The enhanced corrosion resistance of ZM coatings mainly depends on different corrosion products.

摘要

为了探究镁对耐蚀性影响的机理，对连续热浸镀锌Zn-Mg镀层的微观结构进行了研究。本文计算了Al低角附近的Zn-0.20 wt% Al-Mg三元相图的垂直截面。结果表明，Al低角附近的Zn-0.20 wt% Al-Mg三元相图的相组成与Zn-Mg二元相图相同，这表明Zn-Mg（ZM）镀层中的Al主要集中在镀层与钢基体之间的界面层。采用隧道电子显微镜（TEM）研究了含0.20 wt% Al且Mg含量为1.0-3.0 wt%的连续热浸镀锌ZM镀层的微观结构。随着Mg含量的增加，镀层中Zn的形态从块状变为条状，最后变为网状，MgZn₂从棒状变为网状。ZM镀层中的Al主要偏聚在Fe₂Al₅抑制层，向锌液中添加Mg会使该抑制层变薄且不均匀。在盐雾试验中，与GI镀层相比，首次出现红锈的时间增加了两倍多，红锈的扩展速率降低了四倍多。含2.0 wt% Mg的ZM镀层具有最佳的耐蚀性。ZM镀层耐蚀性的提高主要取决于不同的腐蚀产物。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b30/5578346/260b11f5a3c0/materials-10-00980-g012.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b30/5578346/b8c409afc19c/materials-10-00980-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b30/5578346/6d1122838e55/materials-10-00980-g007.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b30/5578346/260b11f5a3c0/materials-10-00980-g012.jpg

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