Enhanced high temperature oxidation resistance for γ-TiAl alloy with electrodeposited SiO2 film. (1st August 2018)

• Record Type: Journal Article
• Authors: Wu, Lian-Kui; Wu, Wei-Yao; Song, Jia-Lin; Hou, Guang-Ya; Cao, Hua-Zhen; Tang, Yi-Ping; Zheng, Guo-Qu
• Is Part Of: Corrosion science. Volume 140(2018)
• Page Start: 388
• Page End: 401
• Publication Date: 2018-08-01
• Subjects: Intermetallics -- Coatings -- Thermal cycling -- High temperature corrosion -- Oxide coating; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2018.05.025
• Languages: English
• ISSNs: 0010-938X

Abstract

Graphical abstract: Highlights: SiO2 film was prepared on TiAl alloy by electrodeposition. Compact sintered glass-like oxide scale emerges after thermal oxidation. The oxide scale formed on the SiO2 film coated TiAl is Si- and Al-enriched. TiAl alloy coated with E-SiO2 film exhibits good oxidation resistance. Abstract: Thickness controllable SiO2 film was prepared on γ-TiAl alloy by cathodic electrodeposition. The oxidation behaviour of the specimens at 900 °C was studied. The effects of SiO2 electrodeposition parameters, such as electrolysis time and deposition current density, on the morphology, structure and high temperature oxidation performance of the film were investigated. Results shown during thermal oxidation, the electrodeposited SiO2 film could react with the TiAl alloy to form an alumina- and silicon-enriched glass-like oxide scale, which can prevent the inward diffusion of oxygen from air to the film/alloy interface, resulting in the remarkable decreased oxidation rate of the alloy.