Enhanced Fe-Al Interfacial Reaction in Hot-Dip Zn-Al-Mg Alloy-Coated Steel by Adding Si to the Molten Bath
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This study investigated the impact of Si addition on Al-Fe intermetallic layer formation and growth in a Zn-6%Al -3%Mg coating bath. The presence of trace amount of Si in the bath created a continuous η-Fe2Al5 layer at the Fe/coating interface at a low bath temperature, while an incomplete θ-Fe4Al13 layer was formed with almost no Si added. It is widely acknowledged that Si atoms can fill vacancies along the caxis of the orthorhombic Fe2Al5 unit cell, preventing Al diffusion and impeding the growth of Fe2Al5. The presence of Fe2Al5 containing Si can also suppress Fe dissolution. Findings of this study suggest that the addition of Si may promote the dissolution of Fe in the initial stage of Fe-Al reaction and provide a strong driving force for η phase formation at the substrate/bath interface. Therefore, with a small amount of Si added to a galvanized bath with a composition close to the eutectic point, a lower bath temperature can be used while still ensuring good Fe/coating adhesion.
Abstract
This study investigated the impact of Si addition on Al-Fe intermetallic layer formation and growth in a Zn-6%Al -3%Mg coating bath. The presence of trace amount of Si in the bath created a continuous η-Fe2Al5 layer at the Fe/coating interface at a low bath temperature, while an incomplete θ-Fe4Al13 layer was formed with almost no Si added. It is widely acknowledged that Si atoms can fill vacancies along the caxis of the orthorhombic Fe2Al5 unit cell, preventing Al diffusion and impeding the growth of Fe2Al5. The presence of Fe2Al5 containing Si can also suppress Fe dissolution. Findings of this study suggest that the addition of Si may promote the dissolution of Fe in the initial stage of Fe-Al reaction and provide a strong driving force for η phase formation at the substrate/bath interface. Therefore, with a small amount of Si added to a galvanized bath with a composition close to the eutectic point, a lower bath temperature can be used while still ensuring good Fe/coating adhesion.
참고문헌 (12)
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