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The production of zinc coated steels for the body of automobile has increased recently because of protection of the steel from environmental corrosion.1) However, the reserve of Zn is estimated to run out approximately 20 years.2) Alternative coating materials are required for sustainable supply of surface coated steels. A coating of Al–Mg–Si alloy is proposed as a potential alternative because Al has large amount of reserve and exhibits high corrosion resistance.3) Magnesium offers sacrificial protection to a coating. Silicon suppresses the growth of Fe–Al intermetallic layer which generates between the coating and Fe substrate.4–6) Thinner intermetallic layer is better for the formability of the aluminized steel.7,8) The Al–8.2 wt%Mg–4.8 wt%Si alloy which is the quasi-binary eutectic composition in Al– Mg2Si system is a candidate for the coating material. The aluminized steel is expected to be fabricated in continuous coating process. In this process, Fe dissolves from steel to the liquid, and saturation is reached due to continuous immersion of the steel. Solubility of Fe is important to fabricate a coating of the Al alloy, because the microstructure of a coating layer shows the solidified structure of the Fe saturated liquid of Al–Mg–Si alloy. On the other hand, the layers of FeAl3 and Fe2Al5 form on steel during the immersion of steel in the liquid of Al–Mg–Si alloy.9) This reaction takes place within several seconds. The early stage of reaction may frequently be so fast that the concentrations in the liquid alloy near the reaction interface would be different from those in the bulk. Solubility of Fe in the liquid of Al alloy is influenced by concentrations of the other elements. It is necessary to determine the solubility of iron as functions of concentrations of the other elements. Phillips10) reported the Al–Mg–Si–Fe quaternary phase diagram. Figure 1 shows the liquidus at various temperatures in the Al-rich region at 8 wt%Mg. The alloy composition for aluminizing is shown in this figure. It indicates that the solubility of Fe in the liquid of the alloy at 973 K is approximately 2.5 wt%, and FeAl3 is in equilibrium with the liquid of Al alloy. However, Phillips mentioned that the liquidus in the area where FeAl3 is a primary crystal could not link up with the liquidus in his previous report11) of Al– Si–Fe ternary system. Hence, the solubility of Fe in the liquid of Al–Mg–Si alloy is still in question. This study determines the solubility of Fe in the Al rich region of Al–Mg– Si system at 973 K.

Solubility of Fe in Al Rich Region of Al^|^ndash;Mg^|^ndash;Si System at 973 K