Abstract: The tissue changes and growth kinetics of Fe-x%Mn alloy plating are investigated using scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS) instrumentation after immersion plating of pure iron, Fe-0.3%Mn, Fe-0.8%Mn, Fe-1.3%Mn, Fe-1.8%Mn, and Fe-2.5%Mn alloys in a pure zinc bath at 450℃ for 30~480 s. The results show that with the addition of Mn content, the plating organization is basically ζ phase and δ phase, and when the Mn content is 1.8%, cracks began to appear in the plating.In the growth kinetics of Fe-x%Mn alloy plating, the thickness of the plating is reduced compared to that of pure Fe plating,the growth rate of the plating thickness is increased with the extension of the immersion plating time, and the growth mechanism of Fe-Mn alloy is mainly controlled by diffusion mechanism.During the immersion process, the diffusion channels sequentially pass through the liquid phase ζ entry phase δ,and the increase in the mass fraction of manganese in the phase layer will cause the diffusion channel to deviate from the true alloy composition.

Key words: hot dip galvanizing, Mn content, phase ζ, phase δ