• Mugrauer, Claudia
• Gerold, Eva
• Trasca, Raluca Andreea
• Eßl, Werner
• Goodwin, Frank
• Reiss, Georg
• Kharicha, Abdellah
• Stefan-Kharicha, Mihaela

Abstract

The minimization of unwanted dross build-up formation on the sink rolls in continuous hot-dip<br/>galvanizing lines is a key goal of the industry. In this study, the CFD multi-physics modeling of<br/>the surface reaction kinetics for dross build-up growth and the coupling to the mass transfer is<br/>the basis for the evaluation of relevant process parameters. The results of a virtual Design of<br/>Experiments were processed by neural network approaches, as well as linear regression<br/>modeling to build a surrogate process model. It was found that the bath Al concentration has<br/>the highest effect (&gt; 80 pct) on the dross build-up rate on the sink rolls. Operating the zinc bath<br/>at higher Al concentrations decreases the dross build-up reaction rate. Furthermore, it was<br/>found by the CFD multi-physics model that the local dross build-up rate increases toward the<br/>edges of the roll grooves which might lead to the occurrence of strip surface defects.

Topics

• impedance spectroscopy
• surface
• experiment
• zinc
• defect