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High temperature oxidation resistance of γ-TiAl alloy with pack aluminizing and electrodeposited SiO2 composite coating

Lian-Kui Wu,Jing-Jia Wu,Wei-Yao Wu,Guang-Ya Hou,Hua-Zhen Cao,Yi-Ping Tang,Hui-Bin Zhang,Guo-Qu Zheng

A novel Si-Al composite coating was prepared on γ-TiAl alloy by a two-step method. Firstly, an aluminizing coating was fabricated on γ-TiAl alloy via pack cementation technique. Then a SiO 2 coating was prepared on this aluminizing coating via cathodic electrodeposition. The high temperature oxidation resistance of this composite coating was evaluated under 1000 °C. During the oxidation process, this Si-Al composite coating can react with TiAl and prevent the inward diffusion of oxygen from air to the film/alloy interface, resulting in the remarkable decreased oxidation rate of the alloy.