|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Surface Engineering for Improved Corrosion Resistance
||Effect of Coating Composition on Microstructure and Corrosion Resistance of Zn-Mg-Al Hot-dip Alloy Coated Steel Sheets
||Min-suk Oh, Jung-Han Kim, Jae-Ik Cho, Cheol-Woo Kim
|On-Site Speaker (Planned)
The effects of Mg and Al contents on the structure and corrosion resistance of Zn-Mg-Al hot-dip galvanized steel were investigated. Zn alloy coatings of various compositions of Mg and Al were prepared with a hot-dip galvanizing simulator. By addition of Mg and Al, various intermetallic compounds, such as primary Zn, Zn/MgZn2 binary eutectic and Zn/Al/MgZn2 ternary eutectic were formed in the coating layer. As the contents of Al and Mg increased, the eutectic volume ratio proportionally increased and the corrosion resistance improved. Analysis of the corrosion products is based on the fact that the Zn / MgZn2 eutectic mixture preferentially dissolves in the early stage of corrosion, migrates to the cathode region of the exposed steel cutting area, precipitates and forms Mg-containing dense and ordered corrosion product, contributing to improvement of corrosion resistance.
||Planned: Supplemental Proceedings volume