FeZn7

FeZn7 is a chemical compound that can be formed during the galvanization process. Galvanization involves coating steel with a layer of zinc to protect it from corrosion. When steel and molten zinc are in contact at elevated temperatures, intermetallic phases can form between the iron and zinc. FeZn7 is one such intermetallic phase. It is characterized by a specific crystal structure and composition, with approximately 86% zinc and 14% iron by weight.

The formation of FeZn7 occurs in layers beneath the outer zinc coating on galvanized steel. Its presence is a natural consequence of the diffusion of iron into the molten zinc and zinc into the steel during the hot-dip galvanizing process. While the outer layer of pure zinc provides sacrificial protection, these intermetallic layers contribute to the overall adhesion and integrity of the coating. The thickness and morphology of the FeZn7 layer, along with other iron-zinc intermetallic phases like FeZn3 and FeZn13, can influence the mechanical properties and corrosion resistance of the galvanized coating. Understanding the formation and behavior of FeZn7 is important for controlling the quality and performance of galvanized steel in various applications.