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Effect of Mg on the Microstructure and Corrosion Resistance of the Continuously Hot-Dip Galvanizing Zn-Mg Coating
Dong, AP; Li, BP; Lu, YL; Zhu, GL; Xing, H; Shu, D; Sun, BD; Wang, J
2017
Source PublicationMATERIALS
ISSN1996-1944
Volume10Issue:8Pages:-
Subtype期刊论文
AbstractThe 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.
KeywordCoated Steel Sheet Zinc Behavior Alloys
DOI10.3390/ma10080980
Indexed BySCI
WOS KeywordCOATED STEEL SHEET ; ZINC ; BEHAVIOR ; ALLOYS
Language英语
WOS IDWOS:000408731600134
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/28626
Collection中科院上海应用物理研究所2011-2019年
Recommended Citation
GB/T 7714
Dong, AP,Li, BP,Lu, YL,et al. Effect of Mg on the Microstructure and Corrosion Resistance of the Continuously Hot-Dip Galvanizing Zn-Mg Coating[J]. MATERIALS,2017,10(8):-.
APA Dong, AP.,Li, BP.,Lu, YL.,Zhu, GL.,Xing, H.,...&Wang, J.(2017).Effect of Mg on the Microstructure and Corrosion Resistance of the Continuously Hot-Dip Galvanizing Zn-Mg Coating.MATERIALS,10(8),-.
MLA Dong, AP,et al."Effect of Mg on the Microstructure and Corrosion Resistance of the Continuously Hot-Dip Galvanizing Zn-Mg Coating".MATERIALS 10.8(2017):-.
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