A study on the contol mechaanism of Fe deposition in gavannealed steel sheet

용융아연 합금도금강판의 Fe석출량 제어기구에 관한 연구

Galvannealing is becomming the main stream of the coating technology applied to automobile outer and inner panels due to its low cost and easy application applied to automobile outer and inner panels due to its low cost and easy application in thick Zn coating, compared to electro galvanizing. Despite of filed up data with an experience in this field, galvannealing in thick Zn coating is getting more difficult because of the absence of Fe deposition in Zn coating. As a result, it exhibits, with different steel sheet and grain size there is a proper temperature range which is good for the tarket coating thickness of galvannealing. In case of 1,200mm wide and 0.77 mm thick extra low carbon steel with 20$mu extrm{m}$ grain size, its proper temperature range for galvannealing of one side 60g/$\textrm{m}^2$ is 470-$480^{\circ}C$.