The electrochemical behavior and characterization of the anodic oxide film formed on titanium in NaOH solutions

Magdy A.M. Ibrahim, Dujreutai Pongkao, Masahiro Yoshimura

研究成果: Article同行評審

30 引文 斯高帕斯(Scopus)

摘要

Titanium dissolution and passivation were studied in NaOH aqueous solution using open-circuit potential, potentiodynamic and potentiostatic techniques. Potentiodynamic data showed that the active-passive transition involves active metal dissolution followed by formation of a poorly conducting passive oxide film that passivates the electrode. The critical current density varied with pH as d log jm/dpH = -0.098 in the pH range 11.00-14.00, while the passivation potential is changed according to the following two features: at pH 10.55-13.00, dEm/dpH = -0.06 V; and at pH 13.50-14.00, dEm/dpH = -0.40 V. The apparent activation energy, E*, was calculated from the slope of the Arrhenius plot and was found to be 12.6 kJ mol-1. Current-time transients showed that the growth of titanium oxide passive film is a diffusion-controlled process. XPS measurements indicated that the passive oxide film consists mainly of TiO2 and a mixture of suboxides of Ti2O3 and TiO.

原文English
頁(從 - 到)341-350
頁數10
期刊Journal of Solid State Electrochemistry
6
發行號5
DOIs
出版狀態Published - 2002 六月

All Science Journal Classification (ASJC) codes

  • 材料科學(全部)
  • 凝聚態物理學
  • 電化學
  • 電氣與電子工程

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