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Humid-Air and Aqueous Corrosion Models for Corrosion-allowance Barrier Material

Published online by Cambridge University Press:  15 February 2011

J. H. Lee ,
J. E. Atkins  and
R. W. Andrews
J. H. Lee
Affiliation:
INTERA, Inc./CRWMS M&O 101 Convention Center Drive, Suite P- 110, Las Vegas, NV 89109, USA
J. E. Atkins
Affiliation:
INTERA, Inc./CRWMS M&O 101 Convention Center Drive, Suite P- 110, Las Vegas, NV 89109, USA
R. W. Andrews
Affiliation:
INTERA, Inc./CRWMS M&O 101 Convention Center Drive, Suite P- 110, Las Vegas, NV 89109, USA
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Abstract

Humid-air and aqueous general and pitting corrosion models (including their uncertainties) for the carbon steel outer containment barrier were developed using the corrosion data from literature for a suite of cast irons and carbon steels which have similar corrosion behaviors to the outer barrier material. The corrosion data include the potential effects of various chemical species present in the testing environments. The atmospheric corrosion data also embed any effects of cyclic wetting and drying and salts that may form on the corroding specimen surface. The humid-air and aqueous general corrosion models are consistent in that the predicted humid-air general corrosion rates at relative humidities between 85 and 100% RH are close to the predicted aqueous general corrosion rates. Using the expected values of the model parameters, the model predicts that aqueous pitting corrosion is the most likely failure mode for the carbon steel outer barrier, and an earliest failure (or initial pit penetration) of the 100-mm thick barrier may occur as early as about 500 years if it is exposed continuously to an aqueous condition at between 60 and 70°C.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 412: Symposium V – Scientific Basis for Nuclear Waste Management XIX , 1995 , 571
Copyright
Copyright © Materials Research Society 1996

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