Abstract
Effect of increasing Al content of Zn coating bath on the durability of hot dip galvanizing steel sheet is studied. After investigating the corrosion mechanism, easiness of coating operation and economical merit of Zn-Al coating, Zn-4.5%Al-0.1%Mg alloy coated steel sheet has been developed. It has an excellent corrosion performance in various atmosphere and a superior coating adherence to the conventional galvanized steel sheet. On the basis of long period exposure test results, it is expected to decelerate the development of red rust on the painted sheet. Therefore, it has a bright future as a resource-savable coated steel sheet.
