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Zn-Al-Mg coating has better corrosion resistance compared to pure zinc coating. Combined with its unique characteristics of scratch self-healing and incision protection, it has been increasingly valued by steel production enterprises and downstream users, especially in environments with harsh material service conditions. Customers have a strong desire to adopt this new type of coating. Zn-Al-Mg is commonly used in fields such as solar thermal power generation and animal husbandry. With the improvement of coating performance and surface quality of Zn-Al-Mg products, their application areas are gradually expanding to industries such as home appliances and automobiles, which puts forward corresponding requirements for the heat resistance of Zn-Al-Mg products. Zn-Al-Mg coated steel plates will encounter heat processing and heat treatment during use, the most common of which are welding and cutting. In addition, the Zn-Al-Mg coating may encounter high-temperature application environments during use, such as near the heating position in water heaters. Therefore, the study of the performance stability of Zn-Al-Mg coatings in different temperature ranges is receiving increasing attention. This article investigates the microstructure changes inside the Zn-Al-Mg coating (Zn-1.3Al-1.1 Mg) with low aluminum and low magnesium content after heating at different temperatures (300 °C, 500 °C, 700 °C) and holding in the furnace for 10 min, as well as its effects on the physical and chemical properties. The morphology of the cross-sectional and surface structures of the heat-treated coating is mainly characterized by electron microscopy, and the composition of EDS in different regions is detected by electron microscopy; At the same time, XRD analysis was conducted on the elemental distribution on the surface of the coating; XPS performance testing of samples subjected to different heat treatment processes; Evaluate the corrosion resistance of the sample using electrochemical methods. The results showed that when heated to 700 °C, the morphology of the cross-sectional structure of the low aluminum and low magnesium coating underwent significant changes, and the surface structure appeared loose and porous; The electrochemical results show that the corrosion resistance has decreased.

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Study on the Microstructure Evolution and Corrosion Resistance of a ZnAlMg Coating After Heat Treatment

  • 会议论文

  • 发表日期：

    2026年

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  • Guanghui Liu,
  • Huaxiang Teng,
  • Chengliang Xu,
  • Guangrui Jiang

摘要

Zn-Al-Mg coating has better corrosion resistance compared to pure zinc coating. Combined with its unique characteristics of scratch self-healing and incision protection, it has been increasingly valued by steel production enterprises and downstream users, especially in environments with harsh material service conditions. Customers have a strong desire to adopt this new type of coating. Zn-Al-Mg is commonly used in fields such as solar thermal power generation and animal husbandry. With the improvement of coating performance and surface quality of Zn-Al-Mg products, their application areas are gradually expanding to industries such as home appliances and automobiles, which puts forward corresponding requirements for the heat resistance of Zn-Al-Mg products. Zn-Al-Mg coated steel plates will encounter heat processing and heat treatment during use, the most common of which are welding and cutting. In addition, the Zn-Al-Mg coating may encounter high-temperature application environments during use, such as near the heating position in water heaters. Therefore, the study of the performance stability of Zn-Al-Mg coatings in different temperature ranges is receiving increasing attention. This article investigates the microstructure changes inside the Zn-Al-Mg coating (Zn-1.3Al-1.1 Mg) with low aluminum and low magnesium content after heating at different temperatures (300 °C, 500 °C, 700 °C) and holding in the furnace for 10 min, as well as its effects on the physical and chemical properties. The morphology of the cross-sectional and surface structures of the heat-treated coating is mainly characterized by electron microscopy, and the composition of EDS in different regions is detected by electron microscopy; At the same time, XRD analysis was conducted on the elemental distribution on the surface of the coating; XPS performance testing of samples subjected to different heat treatment processes; Evaluate the corrosion resistance of the sample using electrochemical methods. The results showed that when heated to 700 °C, the morphology of the cross-sectional structure of the low aluminum and low magnesium coating underwent significant changes, and the surface structure appeared loose and porous; The electrochemical results show that the corrosion resistance has decreased.