Influence of Rare Earth on Hot-Dipped 55%Al-Zn Alloy Coating
Simulation experiment was done to investigate the effects of rare earth on hot-dipped Zn-55%Al alloy coating. The results show that the rare earth has little effect on the zinc dross and its burning loss is about 10%. The microstructure of coating is similar to that of solidification bath, and which is made up of phases of rich aluminum, rich zinc, rich silicon and rare earth, and intermetallic layer of Al-Zn-Fe-Si. The rare earth phase is needle or rod, and mainly distributed inside rich zinc phase and on the interface between the coating and steel substrate. The rare earth has no obvious influence on coating grain and spangle size. The appropriate addition of rare earth would be helpful to improve the coating bending formability and corrosion resistance.
Yun-Hae Kim and Prasad Yarlagadda
T. X. Guo et al., "Influence of Rare Earth on Hot-Dipped 55%Al-Zn Alloy Coating", Advanced Materials Research, Vols. 774-776, pp. 1132-1136, 2013