New insight into the role of microscale residual stresses on initial corrosion behavior of Ti35 alloy

• Published in: Corrosion science Vol. 206; p. 110491
• Main Authors: Xu, Jianping, Liu, Chengze, Wu, Jinping, Li, Huan, Qi, Boyi, Zhang, Di, Zhang, Yusheng, Zhao, Yongqing, Zhou, Lian
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.09.2022
• Subjects: Corrosion behavior; Nitric acid; Reprocessing; Residual stress; Ti35 alloy; Corrosion behavior; Reprocessing; Residual stress; Nitric acid; Ti35 alloy
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2022.110491

The effect of microscale residual stresses on the initial corrosion behavior of Ti35 alloys in boiling nitric acid solutions was investigated using a combination of electrochemical and immersion tests. The concentration of microscale residual stresses 48 h before corrosion accelerated the dissolution of Ti2+, Ti3+, and Ta5+, as determined by electrochemical impedance spectroscopy measurements and quantitative X-ray photoelectron spectroscopy analysis. After 48 h, the formation of oxide films with consistent compositions and contents (TiO2-51%, Ti2O3-47%, and Ta2O5-1.9%) prevented the corrosion medium from reaching the outer surface of the metal matrix, reducing the effect of residual stresses on the corrosion behavior. [Display omitted] •Our Ti35 alloy samples displayed similar textures and microstructures.•The HR-HT sample induced the dissolution of Ti2+, Ti3+, and Ta5+.•The formation of oxide films reduced the effect of residual stresses on the corrosion behavior.