The Wetting Behavior of Fe-Si and Fe-Mn Alloy with Al-10%Si Coating

High-strength steel possesses excellent strength, toughness, wear resistance and weld-ability and therefore, are widely used in various fields. Because the high strength steel contains highly content of Mn and Si, they always lead to quality problem for the process of hot-dip aluminum coating. In this work, we applied improved sessile drop method, selected some characteristic systems to measure the change in contact angle and diameter of Al-10%Si droplets wetting on a quality of Mn (0wt%, 0.5 wt%, 1.5wt%, 2.5wt%) and Si (0wt%, 0.5wt%, 1.5wt% 2.5wt%). Then the microstructure and composition of interfacial layer are analyzed by SEM/EDS, the phase composition is analyzed by XRD. The results showed that the contact angle is increasing with the contents of Si increasing. However, the contact angle is decreasing with the contents of Mn increasing.