Flux Effect Onto Peritectic Phases Growth In The Zinc Coating

Abstract

A model of the (Zn) – coating formation on the iron/steel substrate is proposed. The model assumes the phases’ sub-layers creation in a sequence. This sequence is referred to the Fe-Zn phase diagram. However, this sequence of phases’ appearance is perturbed by the flux presence in the zinc bath. The flux effect on the coating morphology and appearance/disappearing of some sub-layers is analysed. The phases’ formation is treated as the result of the peritectic reaction accompanying the coating solidification. A comparison of the coating formations before and after flux decay is delivered. Thus, a function which describes the flux decay is also analysed. Additionally, a ternary Fe-Zn-F(flux) phase diagram is considered. The varying zinc concentration across the phases sub-layers is described with the use of the function which determines the flux decay. The behaviour of the solidification path before and after flux decay is discussed due to the adequate equations formulated in frame of the current model.

Keywords

• Fe-Zn-flux phase diagram
• flux disappearing
• coating thickening