Microstructure of hot-dip galvanized Zn-Al-Mg alloy coating

被引：17

作者：

Yu, Kang-Cai ^{[1
,2
]}

Li, Jun ^{[2
]}

Liu, Xin ^{[2
]}

Li, Jian-Guo ^{[1
]}

Xue, Xiao-Hua ^{[1
]}

机构：

[1] School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China

[2] Baoshan Iron and Steel Co. Ltd., Shanghai 201900, China

来源：

Journal of Shanghai Jiaotong University (Science) | 2012年 / 17卷 / 06期

关键词：

Energy dispersive spectroscopy - Galvanizing - Silicon alloys - X ray diffraction analysis - Binary alloys - Microstructure - Zinc alloys - Aluminum alloys - Aluminum coatings - Crystal structure - Scanning electron microscopy - Solidification - Ternary alloys - High resolution transmission electron microscopy;

D O I：

10.1007/s12204-012-1342-5

中图分类号：

学科分类号：

摘要：

The microstructure of hot-dip galvanized Zn-11%Al-3%Mg-0.2%Si alloy coating was studied in this article. X-ray diffraction analysis revealed the coating is composed by Zn, Al and MgZn2 phase. Optical microscope (OM) and scanning electron microscope (SEM) observations showed the coating is occupied by snowflake-like dendrite, double hexagonal organization and eutectic. The coating backbone was the dendrite considered to be a phase of hexagonal close-packed (HCP) structure judging form its morphology according to the crystal growth way in the coating. Transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS) researches on the dendrite suggested that an intermediate Zn-Al phase was formed at high temperature, then decomposed into a type of Zn-Al granular eutectoid after cooling down to room temperature, while the eutectoid Zn and Al had a certain crystallographic relationship. The coating solidification process and the grain crystal structure were discussed. © Shanghai Jiaotong University and Springer-Verlag Berlin Heidelberg 2012.

引用

页码：663 / 667

页数：4