Identification of segregation phase on a batch hot‐dip‐coated Zn/0.1Al/0.2Sb surface

Abstract

The segregation of antimony in a batch hot-dipped regular-spangle galvanized coating from a Zn-0.1Al-0.2Sb bath was investigated. The samples were characterized by using SEM/EDS. The nature of the segregation phase was determined by XRD as bSb 3 Zn 4 . Assisted with Sb-Zn phase diagram, the behavior of antimony during the solidification process of the Zn-0.1Al-0.2Sb coating is examined. It is suggested that the coating solidification proceeds in three stages. Owing to the cooling rate of batch hot dip galvanizing process smaller than that of continuous hot dip galvanizing line (CGL), the resulting structure of the segregation phase in current work is bSb 3 Zn 4 instead of metastable zSb 2 Zn 3 for CGL.

Effect of Ti and Sb Elements Addition on the Microstructure and Corrosion Resistance of Hot-Dip Galvanized Zn-11Al-3Mg Alloy

“…Moreover, the studies have shown that the addition of Sb can improve the fluidity of the bath and reduce the surface tension. In addition, the addition of Sb at a small content (0.04-0.2 wt.%) can improve the uniformity of the zinc coating and the bonding force with the steel substrate [15][16].…”