Abstract
Both titanium (Ti) and lanthanum (La) can improve the quality of hot-dip 55%Al-Zn-Si coating. However, the authors found that the dross problem was very serious when titanium and lanthanum coexisted in the bath. In order to reveal the cause of this phenomenon, different contents of Ti were added into the 55%Al-Zn-Si-La bath to study its influence on the dross formation. The results indicated that La promotes the formation of Si-rich τ5 (Fe2Al8Si or α-AlFeSi) phase in the bath while Ti has no influence on the Fe-Al phase. Furthermore, it was also found that the addition of Ti into the 55%Al-Zn-Si-La bath would lead to the precipitation of TiAl3 and Ti2Al20La type of intermetallic compounds, both of which are insoluble and become part of the dross, therefore increase the amount of dross in the bath.
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