12th International Conference on Zinc & Zinc Alloy Coated Steel Sheet - GALVATECH 2021

A steel is used in all industries because it has many advantages such as high strength, easy workability and high-quality paintability. Nevertheless, steel can not be used for a long time due to the occurrence of rust caused by various factors. In order to improve the corrosion resistance of steel, the development of a high corrosion resistance steel with Mg and Al is being studied. Also, we should replace the galvanized steel owing to rising prices and depletion of zinc resources, deterioration of the corrosive environment, competitiveness of market and so on. However, it is difficult to add more than 3wt.% Mg because of oxidation problem of bath at the production process, therefore, research is being conducted to increase the Al content. In this study, the effect of corrosion resistance on a different Al content was compared through a microstructure analysis of the coating layer, accelerated corrosion resistance test, potentiodynamic polarization test. As a result, it has been observed that the corrosion current is reduced as the Al content is increased.