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

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• 作者：Kang-cai Yu (1) (2)
  Jun Li (2)
  Xin Liu (2)
  Jian-guo Li (1)
  Xiao-huai Xue (1)
  
• 关键词：hot ; dip galvanized coating ; Zn ; Al ; Mg coating ; dendrites ; grain orientation ; TG 178
• 刊名：Journal of Shanghai Jiaotong University (Science)
• 出版年：2012
• 出版时间：December 2012
• 年：2012
• 卷：17
• 期：6
• 页码：663-667
• 全文大小：650KB
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• 作者单位：Kang-cai Yu (1) (2)
  Jun Li (2)
  Xin Liu (2)
  Jian-guo Li (1)
  Xiao-huai Xue (1)
  
  1. School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai, 200240, China
  2. Baoshan Iron & Steel Co. Ltd., Shanghai, 201900, China
  
• ISSN：1995-8188

文摘

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.