Corrosion Behavior and Sacrificial Ability of Hot Dip Al Mg Si Coated Steel
Introduction Hot dip galvanized steels are widely used in the engineering fields such as automobiles, construction, and household appliances. However, it is said that zinc resources may be exhausted within several decades, if consumption of zinc resources over the world continues at the present rate. Recently, the authors have been trying to develop new hot dip coating of Al Mg Si alloys for steels as a substitution of hot dip zinc coating. In the new coating, all the alloying elements are ubiquitous and significantly abundant mineral resources compared to zinc. However, to apply the new coating system to highstrength steels, corrosion and electrochemical behavior, galvanic ability of the new coating in a corrosion media have to be investigated. In this study, Al Mg Si coated steels are newly developed by hot dipping technique and some corrosion tests of the coated steels are performed. In addition, the possibility of hydrogen embrittlement of AlMg Si coated steels is also discussed.