硝酸溶液中におけるチタンの耐食性に及ぼす酸化剤の影響

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タイトル別名
  • Effect of Oxidizing Agents on Corrosion Resistance of Commercially Pure Titanium in Nitric Acid Solution
  • ショウサン ヨウエキチュウ ニ オケル チタン ノ タイショクセイ ニ オヨボ

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Titanium is one of the candidate materials for solidification process equipment of high level liquid waste produced in reprocessing of spent nuclear fuel from Light Water Reactors.<br>The high level liquid waste is a nitric acid solution containing various kinds of oxidizing agents such as Cr2O72-, Fe3+ and Ce4+ ions and is very corrosive to metallic materials. Therefore, effect of oxidizing agents on corrosion resistance of commercially pure titanium in nitric acid solution was investigated using gravimetric and electrochemical techniques.<br>As a result, it was clarified that corrosion resistance of titanium was markedly improved by adding oxidizing agents having high redox potentials. The peak height ratio of O 1s/Ti 2P obtained from ESCA spectra for the specimens revealed that the passive film formed in Cr2O72- free nitric acid solution consisted of Ti2O3 but it formed in the solution with Cr2O72- consisted of TiO2 which was more stable thermodynamically. This is the reason why Cr2O72- inhibits titanium to corrode. Cr2O72- seems to oxidize dissolved Ti3+ in the solution to Ti4+ and TiO2 would form by following reaction; Ti4++2H2O→TiO2+4H+.<br>Furthermore, titanium showed an excellent corrosion resistance in the simulated high level liquid waste even at high temperature.<br>From these results, it is considered that titanium is a suitable material for the solidification process equipment.

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