Formation of out-burst structure in hot-dip Zn-5mass%Al alloy coating

被引：0

作者：

Uchida, Y

Andoh, A

Komatsu, A

Yamakawa, K

机构：

[1] Nisshin Steel Co Ltd, Steel & Technol Dev Labs, Sakai, Osaka 5928332, Japan

[2] Univ Osaka Prefecture, Coll Engn, Osaka, Japan

来源：

TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN | 1998年 / 84卷 / 10期

关键词：

hot-dip coating; Zn-Al coating; alloy layer; out-burst structure; Al-Fe intermetallic compounds; Fe-Zn intermetallic compounds;

D O I：

暂无

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The formation of the "out-burst" products which is consisted of Al-Fe intermetallic compounds (IMCs) grown locally and abnormally, has been studied to compare with the structure of thin alloy layer normally formed on the sheet steel in a hot-dip Zn-5mass%Al alloy coating at the bath temperature of 450 degrees C. The formation of the out-burst products is not due to the localized growth of thin alloy layer consisted of mainly Zn containing Al3Fe(Al13Fe4), but due to the growth of Al-Fe IMCs with mainly Zn containing Al5Fe2 formed at ferrite grain boundaries near the steel surface. These Al-Fe IMCs are considered to be changed from Fe-Zn IMCs which have been formed by the grain boundary diffusion of Zn. And during changing to Al-Fe IMCs, Zn discharged from Fe-Zn IMCs further diffuses to the adjacent ferrite grain boundaries and also into the adjacent ferrite grains. As a result, Fe-Zn IMCs are formed around Al-Fe IMCs which have been formed at the grain boundaries, and changes again to Al-Fe IMCs. This growth behavior of Al-Fe IMCs formed at the grain boundaries is induced From the results obtained in the previous works that the changing rate from Fe-Zn IMCs to Al-Fe IMCs in a molten Zn-5mass%Al alloy bath at 450 degrees C is very high.

引用

页码：734 / 739

页数：6

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