Regensburg 2010 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 26: Poster Session
MM 26.16: Poster
Tuesday, March 23, 2010, 14:45–16:30, Poster C
Tailoring Model Surfaces and Wettability Measurement for a Fundamental Understanding of Hot-dip Galvanizing — •Takashi Kawano1,2 and Frank U Renner1 — 1Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany — 2Steel Research Laboratory, JFE Steel Corporation, Japan
Hot-dip galvanizing is the process used widely for automotive steel sheets. The wettability of molten Zn with steel substrate is an important issue in the process. Especially, problems can be caused by substances such as Al, Si and/or Mn oxides formed on a substrate surface during the process. Many studies have been done to correlate the wettability and sample composition and/or process conditions related to the practical steel materials or process procedure.
However, the affect of the oxides on the wetting kinetics has not been well explained, because the surfaces of such steel substrates are generally too complicated to understand the fundamental wetting mechanisms.
Our work was started with preparing simple model surfaces so that fundamental wetting kinetics on well defined substrates can be studied with the sessile drop method at high temperatures. Our model surfaces were well defined oxide islands prepared by physical vapor deposition using different masks on flat Fe substrates.
In this report, preliminary data which shows a relation between initial contact angle and Al oxide coverage will be introduced. Comparing among various kinds of oxide species and modeling of the wetting kinetics will be future work.