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Report No.
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Temperature dependence on corrosion behavior of Ta in NaOH solutions

Ishijima, Yasuhiro ; Ueno, Fumiyoshi  ; Abe, Hitoshi 

In spent nuclear fuel reprocessing plant, SUS304/Ta/Zr dissimilar metal joint is used for connect between different devices. And it is known that Ta corrodes in NaOH solutions. The other hand, it is not clear that the temperature effect on corrosion behavior of Ta in NaOH solutions. This study aims to elucidate the effect on temperature effect for corrosion behavior of Ta in NaOH solutions. Immersion tests and electrochemical measurements were carried out in NaOH solutions. Immersion test results show that corrosion rate in 1mol/L NaOH at 353 K was decreased compared to 333 K. And also the test results show that corrosion rate increased with temperature at above 3 mol/L. From SEM observation, dence film was observed at the surface of specimen after immersion test in 1 mol/L NaOH at 353 K. From these results, it is considered that the decrease of corrosion rate in 1mol/L at 353 K was caused by the dence film suppress the Ta dissolution.

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