Modeling Iron Enrichment in Hot-Dip Galvanneal Coatings on Interstitial-Free Steels

摘要

Galvannealed coatings are produced by annealing the hot-dip galvanized sheet soon after it emerges from the zinc bath. The zinc coating is then enriched in iron with concurrent development of several phases. Coating properties depend on its iron content, and in the final galvannealed product, the alloyed Fe-Zn coating contains about 10 wt pct iron. It is therefore of considerable practical interest to describe the kinetics of iron enrichment of the zinc coating. In the present work, a simple quantitative model is proposed to describe the kinetics of iron enrichment of the Fe-Zn coating.