Influence mechanism of different elements and alloy phases on the corrosion resistance of Zn-Al-Mg coated steel in the atmospheric environment: A review

• Published in: Corrosion communications 2024-03, Vol.13, p.49-59
• Main Authors: He, Xin, Zhou, Xun, Shang, Ting, Liu, Wuhua, Jiang, Guangrui, Liu, Chao, Cheng, Xuequn, Zhang, Xin, Li, Xiaogang
• Format: Article
• Language: English
• Subjects: Black rust; Corrosion products; Corrosion resistance; Filiform corrosion; Zn-Al-Mg coated steel
• ISSN: 2667-2669; 2667-2669
• DOI: 10.1016/j.corcom.2023.11.001

•The corrosion resistance of Zn-Al-Mg coatings is summarized.•The influence of different alloying elements is elaborated.•The filiform corrosion and the black rust on Zn-Al-Mg coatings are discussed.•The failure process of Zn-Al-Mg coating is introduced. Sacrificial metallic coatings are an effective strategy for mitigating corrosion in steel operating in industrial environments. This review article focuses on examining the protection mechanism of zinc-aluminum-magnesium (Zn-Al-Mg) coatings on steel substrates. Specifically, it investigates the effects of various elements and their corrosion products on the corrosion resistance of Zn-Al-Mg coatings. Furthermore, this review summarizes the formation mechanisms of various specialized corrosion modes that occur following the corrosion of Zn-Al-Mg coatings, based on previous experimental findings. It also includes suggestions for further research areas that could contribute to the development of highly corrosion-resistant and long-lasting coatings. These suggestions are based on published laboratory and field test results available in literature.