Speaker
Description
In recent years, steel industries have been various studies to apply ZnMgAl coatings to automobiles. Initially, the solidification experiment of ZnMgAl coating on steel was investigated by using in-situ real time x-ray scattering, we confirmed that the solidification prceeds in the order of Zn, Zn/MgZn2 binary eutectic and Zn/MgZn2/Al ternary eutectic phases. Also, we evaluated the properties such as wettability, surface roughness, fluidity and corrosion resistance according to Mg and Al with varying contents. The difference in corrosion products between the general hot-dip galvanizing(GI) and ZnMgAl coating was confirmed in detail. In the case of ZnMgAl coating, the dense corrosion products were formed on surface, thus the corrosion resistance was superior than GI material. In addition, the ZnMgAl coated steel sheet was excellent in formability due to its low coefficient of friction. Phosphate treatment, weldability and adhesion properties were similar to those of general hop-dip galvanized steel sheets to apply for automotive.
Keywords
ZnMgAl coating, Hot-dip galvanizing, Automotive