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Insight into relationship between composition,thickness and electrochemistry behavior of oxide film formed on TA15under different potentials in 0.5 mol·L^(-1)H_(2)SO_(4)

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Rare Metals 2023年第5期42卷 1760-1772页

作者： Fei-Fei Huang Yi Qin Qing-Rui Wang Hiroaki Yoshida Lei Wen Hai Chang Ying Jin National Center for Materials Service Safety University of Science and Technology BeijingBeijing100083China Innovation Group of Marine Engineering Materials and Corrosion Control Southern Marine Science and Engineering Guangdong LaboratoryZhuhai519080China Department of Physical Science Hiroshima UniversityHigashi-Hiroshima739-8526Japan

The oxide film formed on TA15 alloy in0.5 mol·L^(-1)H_(2)SO_(4)at different applied potentials is investigated by evaluating the film formation current density,film thickness,surface film composition,valence state,and the electrochemical *** relative quantitative spectral analysis revealed by X-ray photoelectron spectroscopy(XPS)and X-ray absorption spectra(XAS)shows that the increasing applied potential promotes the formation of thick and high-valence state *** contrasting with XAS of the reference titanium oxides,it is found that TiO_(2)within the oxide film changes from anatase type to rutile type with the potential increases to 2.00 *** oxide film formed at passive region has better protection performance,and with the increase of applied potential,the corrosion resistance of passive film increases,whereas the ND(donor density)values obtained from the Mott-Schottky(MS)results decrease with the increasing applied potential,indicating a better uniformity and protective effect of the oxide *** on above facts,the model of the oxide films formed on TA15 at different applied potentials in passive region and dissolve region is ***,the existence forms of all the TA15alloying elements under the most corrosion resistant condition are confirmed.

关键词： TA15 Electrochemical passivation Corrosion behavior surface compositions and structures

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