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Hot-dip aluminizing method and subsequent interdiffusion treatment were used to develop a TiAl 3 coating on Ti-45Al-2Cr-2Nb-0.15B (at.%) alloy. A two-phase coating consisting of an outer pure Al layer and an inner TiAl 3 layer formed on the alloy after the hot-dip and then a single phase TiAl 3 coating was obtained by using interdiffusion treatment. Oxidation of the TiAl 3 coating was conducted at 900 and 1000°C. Both the interrupt oxidation and the isothermal oxidation tests indicated that the coating provided high protectiveness for the alloy. The coating was stable for at least 300 h during the interrupt oxidation at 900 and 1000°C, and it was stable for at least 500 h at 1000°C and 1000 h at 900°C during the isothermal oxidation. The oxidation behavior of the coating was discussed in detail.

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