Fabrication of TiAl3 coating on TiAl-based alloy by Al electrodeposition from dimethylsulfone bath and subsequent annealing

TiAl3 coating was formed on TiAl alloy by Al electrodeposition from a dimethylsulfone (DMSO2) bath and subsequent annealing. Before the Al electrodeposition, anodic dissolution of TiAl substrate in the DMSO2 bath was conducted to remove the surface oxide layer of the TiAl substrate. By performing the Al electrodeposition immediately after the anodic dissolution, uniform Al films adherent to the TiAl substrate could be obtained. Annealing at 650–1000 °C yielded a single TiAl3 layer or two layers of TiAl3 and TiAl2 on the TiAl substrate. The resulted TiAl3 layer was confirmed to show oxidation-resistance at high temperatures.

Research highlights► TiAl3 coating on TiAl-based alloy by Al electrodeposition and annealing. ► Al layer is electrodeposited on TiAl substrate from dimethylsulfone bath. ► Anodic dissolution of TiAl substrate prevents deposited Al layer from delamination. ► The TiAl3 coating shows oxidation resistance at high temperatures.