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Corrosion Behavior of Carbon Steel in Bicarbonate (HCO3) Solutions

Published online by Cambridge University Press:  21 March 2011

Junhua Dong ,
Toshiyasu Nishimura  and
Toshiaki Kodama
Junhua Dong
Affiliation:
Corrosion Resistant Materials Research Group, National Institute for Materials Science, Sengen 1-2-1, Tsukuba, 305-0047, Japan
Toshiyasu Nishimura
Affiliation:
Corrosion Resistant Materials Research Group, National Institute for Materials Science, Sengen 1-2-1, Tsukuba, 305-0047, Japan
Toshiaki Kodama
Affiliation:
Corrosion Resistant Materials Research Group, National Institute for Materials Science, Sengen 1-2-1, Tsukuba, 305-0047, Japan
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Abstract

Carbon steel is considered in Japan the most promising candidate material for overpacks in high-level radioactive waste disposal. Effects of bicarbonate solutions on the corrosion behavior and corrosion products of carbon steel were investigated by electrochemical measurements; FT-IR spectra and XRD pattern analyses. The results of the anodic polarization measurements showed that bicarbonate (HCO3) accelerates the anodic dissolution and the outer layer film formation of carbon steel in the case of high concentrations, whereas it inhibits these processes in the case of low concentrations. The FTIR and XRD analyses of the anodized film showed that siderite (FeCO3) was formed in 0.5 to 1.0mol/L bicarbonate solution, and Fe2(OH)2CO3 in 0.1 to 0.2mol/L bicarbonate solution, while Fe6(OH)12CO3 was formed in 0.02 to 0.05mol/L bicarbonate solution. In all cases the pH value was around 8.3. The stability of these chemical compositions was discussed using a potential – pH diagram for the Fe-H2O-CO2 system.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 713: Symposium JJ – Scientific Basis for Nuclear Waste Management XXV , 2002 , JJ11.8
Copyright
Copyright © Materials Research Society 2002

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References

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