The study describes the mechanism of structure formation in protective coating, growing on iron surface during hot-dip galvanizing. As a result of isothermal solidification, an alloyed layer of the coating (composed of the sublayers of peritectic Fe-Zn phases) is formed. As a result of peritectic reactions under metastable conditions, the individual phases are born, forming sublayers in the expected sequence of gamma, delta and zeta. The study also proves that in the technology of hot-dip galvanizing, the mechanism of protective coating formation is largely affected by the operation of fluxing. The described mechanism of zinc coating growth allows for an effect that fluxing is said to have on the sequence in which the individual sublayers of intermetallic Fe-Zn phases are formed.
The work was funded by the NCN based on the decision number DEC-2012/05/B/ST8/00100.