Abstract
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.
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