CREVICE CORROSION OF GRADE-2 Ti IN SIMULATED GROUNDWATER FOR GEOLOGICAL DISPOSAL OF HIGH-LEVEL RADIOACTIVE NUCLEAR WASTE

WEI Xin; DONG Junhua; KE Wei

doi:10.3724/SP.J.1037.2013.00090

2013 , Vol. 49 >Issue 6: 675 - 681

DOI: https://doi.org/10.3724/SP.J.1037.2013.00090

CREVICE CORROSION OF GRADE-2 Ti IN SIMULATED GROUNDWATER FOR GEOLOGICAL DISPOSAL OF HIGH-LEVEL RADIOACTIVE NUCLEAR WASTE

WEI Xin ,
DONG Junhua ,
KE Wei

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1) College of Materials Science and Engineering, Dalian University of Technology, Dalian 116024
2) State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

Received date: 2013-02-21

Revised date: 2013-04-11

Online published: 2013-06-11

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Abstract

The influences of temperature and Cl^- concentration on the crevice corrosion of grade-2 Ti in the simulated geological disposal environment of high-level radioactive nuclear waste were investigated by potentiodynamic polarization curves, electrochemical impedance spectroscopy, galvanic current monitoring and potentiostatic polarization. The results showed that all the creviced specimens exhibited the passive characteristics in the initial immersion period at 25-95℃. With extending the immersion time, the crevice corrosion of Ti initiated as a result of the gradual aggressive environment (higher Cl^- concentration and more acidification) in the crevice. As increasing the temperature and Cl^- concentration, the galvanic current increased and the crevice corrosion resistance was decreased. In addition, the critical temperature of crevice corrosion decreased with increasing Cl^- concentration and the applied potential. The damage caused by anodic active dissolution in the crevice mainly located near the crevice mouth.

Key words： high-level radioactive waste; Ti; crevice corrosion; temperature

Cite this article

WEI Xin , DONG Junhua , KE Wei . CREVICE CORROSION OF GRADE-2 Ti IN SIMULATED GROUNDWATER FOR GEOLOGICAL DISPOSAL OF HIGH-LEVEL RADIOACTIVE NUCLEAR WASTE[J]. Acta Metall Sin, 2013 , 49(6) : 675 -681 . DOI: 10.3724/SP.J.1037.2013.00090

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