Halogen effect for improving high temperature oxidation resistance of Ti-50Al by anodization

• Published in: Applied surface science Vol. 407; pp. 246 - 254
• Main Authors: Mo, Min-Hua, Wu, Lian-Kui, Cao, Hua-Zhen, Lin, Jun-Pin, Zheng, Guo-Qu
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.06.2017
• Subjects: Anodization; Halogen effect; High temperature oxidation; Intermetallics; SEM; Halogen effect; Intermetallics; SEM; Anodization; High temperature oxidation
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2017.02.194

[Display omitted] •Anodization can improve the high temperature oxidation resistance of Ti-50Al.•The improved high temperature oxidation resistance is the result of halogen effect.•Anodized Ti-50Al with holes and micro-cracks will be self-repaired during oxidation.•The oxide scale with two layer structures is formed gradually during oxidation. The high temperature oxidation resistance of Ti-50Al was significantly improved via halogen effect which was achieved by anodizing in an ethylene glycol solution containing with fluorine ion. The anodized Ti-50Al with holes and micro-cracks could be self-repaired during oxidation at 1000°C. The thickness of the oxide scale increases with the prolonging of oxidation time. On the basis of halogen effect for improving the high temperature oxidation resistance of Ti-50Al by anodization, only fluorine addition into the electrolyte can effectively improve the high temperature oxidation resistance of Ti-50Al.