| Autor: |
Gloriant, Thierry, Reumont, Guy, Perrot, Pierre |
| Zdroj: |
International Journal of Materials Research: Zeitschrift fuer Metallkunde; December 2021, Vol. 88 Issue: 7 p539-544, 6p |
| Abstrakt: |
The drawback of overthicknesses of coatings when galvanizing silicon steels may be overcome by adding titanium to the zinc bath. In order to understand reactivities between substrates and the alloyed zinc bath, the ternary phase system Fe-Zn-Ti at 450 °C was investigated using diffusion experiments. Three kinds of diffusion couples were used (solid/solid, solid/liquid and solid/vapour under controlled pressure) to describe the whole isothermal section at 450 °C. The solid–liquid reaction accurately reveals the zinc rich corner of the diagram in connection with galvanizing. The analysis of the different phases in each coating allows to determine Ti solubilities in the Fe–Zn intermetallic compounds and to new equilibria in the Fe-Zn-Ti system at 450 °C. Moreover, we show that the diagram obtained, characterized by a huge Γ2domain is metastable. The stable diagram, obtained with long time experiments is characterized by a more restricted Γ2solid solution which extends from the Γ2– FeZn4binary compound to the Γ2– TiFe2Zn22ternary dross. |
| Databáze: |
Supplemental Index |
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