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

doi:10.3390/ma10080980

CAS OpenIR > 中科院上海应用物理研究所2011-2018年

	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
发表期刊	MATERIALS
ISSN	1996-1944
卷号	10 期号:8 页码:-
文章类型	期刊论文
摘要	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.
关键词	Coated Steel Sheet Zinc Behavior Alloys
DOI	10.3390/ma10080980
关键词[WOS]	COATED STEEL SHEET ; ZINC ; BEHAVIOR ; ALLOYS
收录类别	SCI
语种	英语
WOS记录号	WOS:000408731600134
引用统计
文献类型	期刊论文
条目标识符	http://ir.sinap.ac.cn/handle/331007/28626
专题	中科院上海应用物理研究所2011-2018年
推荐引用方式 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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