Galvanic corrosion behavior of titanium-coupled brass and carbon steel in 3 5 wt% NaCl solution

論文翻譯標題: 鈦/黃銅及鈦/碳鋼耦合在3 5 wt% NaCl 水溶液中的伽凡尼腐蝕性質研究
  • 李 昂

學生論文: Master's Thesis

摘要

Galvanic corrosion behavior of bi-metal couples all consisting of commercially pure (CP) titanium in 3 5 wt% NaCl solution was investigated The roles of dissolved oxygen in the solution cathode/anode area ratio and the anodized oxide on titanium surface of titanium were explored in terms of the changes of electrochemical polarity and the magnitude of galvanic current The presence of dissolved oxygen caused an increase in galvanic current for the titanium-carbon steel couple compared with that measured in de-aerated solution However a reverse case was found for the titanium-brass couple By increasing cathode/anode area ratio an increase in galvanic current was found for the titanium/carbon steel couple while a reversion of electrochemical polarity was observed for the titanium/brass couple At a higher titanium/brass area ratio titanium acted as anode while it became cathode due to rapid passivation at a lower area ratio (titanium/brass area ratio 1:10) The composition of the surface film on the each electrode at different cathode/anode area ratios were investigated thoroughly by XPS It was found that the corrosion product layer formed on the carbon steel at titanium/carbon steel area ratio 1:1 and 10:1 were composed mainly of FeOOH and Fe3O4 As decreased titanium/carbon steel area ratio 0 1:1 however corrosion product of Fe3O4 was not detected On the other hand with increasing titanium/carbon steel area ratio increased the signals of Fe3O4 indicating increased the dissolution rate of the carbon steel Moreover the XPS results for titanium coupled to brass at different area ratio implies that with increasing brass area ratio increased the signals of Cu2O and the concentration of ZnO increased from 29 5% to 70 3% This XPS results confirm that the role of area ratio in affecting the polarity reversal of titanium/brass couples In addition SEM was used to analyse the morphology of each electrodes after coupling at different cathode/anode area ratio In the latter case a progressive change in electrochemical polarity during coupling with brass was also observed The formation of an artificial oxide film made the anodized titanium acting as the cathode when coupled with brass
獎項日期2014 二月 6
原文English
監督員Wen-Ta Tsai (Supervisor)

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