New Corrosion-Resistant Zn-Al-Mg Alloy Hot-Dip Galvanized Steel Sheet

• Published in: Corrosion science and technology Vol. 23; no. 2; pp. 121 - 130
• Main Authors: Kohei Tokuda, Yasuto Goto, Mamoru Saito, Hiroshi Takebayashi, Takeshi Konishi, Yuto Fukuda, Fumiaki Nakamura, Koji Kawanishi, Kohei Ueda, Hidetoshi Shindo
• Format: Journal Article
• Language: English; Korean
• Published: 한국부식방식학회 2024
• Subjects: Corrosion mass loss; Hot-dip galvanized steel sheets; Mg effects; Zn-Al-Mg; Mg effects; Hot-dip galvanized steel sheets; Zn-Al-Mg; Corrosion mass loss
• ISSN: 1598-6462; 2288-6524
• DOI: 10.14773/cst.2024.23.2.121

In recent years, Zn-Al-Mg alloy galvanized steel sheets have been widely used as coated steel sheets to support social capital in the infrastructure field. A feature of Zn-Al-Mg alloy-coated steel sheets is that they provide a better corrosion protection period than Zn-coated steel sheets. In this study, the corrosion resistance of a new Zn-Al-Mg alloy-coated steel sheet was investigated and compared to that of conventional commercially available coated steel sheets. The investigation confirmed that increasing the Mg concentration in the Zn-Al-Mg-coated steel sheet improved corrosion resistance, which was more than 10 times that of the galvanized steel sheet specified in JIS G 3302. The study findings also confirmed that the corrosion resistance reached more than twice that of the coated steel sheet specified in JIS G 3323. If such galvanized steel sheets are applied to social infrastructures that are exposed to severely corrosive environments, the service life of the infrastructure might be extended.