Super anticorrosion of aluminized steel by a controlled Mg supply

Abstract

The current anticorrosion strategy makes use of coatings to passively protect the steel, which faces increasing challenge due to the tightened environmental regulations and high cost. This paper reports a new method for achieving a super anticorrosion function in Al-Si alloys through Mg nano-metallurgy, which was characterized by real-time synchrotron measurements. The unique function is based on the formation of an amorphous and self-charge-compensated MgAl2O4-SiO2 phase between the grain boundaries to help prevent the penetration of oxygen species through the grain boundaries. Through this, the corrosion resistance of pristine aluminized steel could be improved almost 20 fold. An analysis of the phases, microstructures of the Mg-coated aluminized layer and corrosion products consistently supported the proposed mechanism. This charge-compensated corrosion resistance mechanism provides novel insight into corrosion resistance.

Influence of Heat Treatment on Corrosion Resistance of Sn/Mg Films Formed by PVD Method on Hot-Dip Galvanized Steel

“…So far, several studies have been reported about the corrosion resistance of Al, Mg, and Zn films prepared by the PVD method. Jeong et al explained that the Mg layer deposited by the PVD method prevents the penetration of oxygen species by forming Mg corrosion products at the grain boundary of the base material [10,18]. La and Park et al showed the effectiveness of the Zn-Mg coating layer on corrosion resistance regarding the formation of protective corrosion products [19,20].…”