Several laboratory methods for accelerated testing have been evaluated and their abilities to access pitting damage during immersion in environments that simulate high-level radioactive waste have been compared. Specifically, we examine and compare corrosion current density, open-circuit potential (OCP), metastable pitting data, and electrochemical noise (EN) data. In our work, a novel method for evaluating EN data has been analyzed. In this method, generalized extreme value (GEV) statistics is used to evaluate the distribution of current transient events greater than 10 μC. We show how the GEV cumulative distribution function from these EN events can be used to access relative pitting damage. Specifically, we demonstrate that the GEV distribution of EN events that exceed a 10-μC threshold correlates well with actual surface damage. However, EN experiments do not appear to predict future damage when compared to 3-month immersion testing. Therefore, while short-term changes in EN data may be good indicators of real-time material behavior, limited EN sample time (weeks) should not be used as an indicator of long-term performance.
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1 September 2006
Research Article|
September 01 2006
Methods for Accessing Pitting Damage in Carbon Steel Exposed to Alkaline Chloride Waste Environments
M.A. Hill;
M.A. Hill
*Materials Corrosion & Environmental Effects Lab Materials Science and Technology Division, MST-6 Los Alamos National Laboratory Los Alamos, NM 87545.
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R.S. Lillard
R.S. Lillard
‡
*Materials Corrosion & Environmental Effects Lab Materials Science and Technology Division, MST-6 Los Alamos National Laboratory Los Alamos, NM 87545.
‡Corresponding author. E-mail: [email protected].
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‡Corresponding author. E-mail: [email protected].
Online ISSN: 1938-159X
Print ISSN: 0010-9312
NACE International
2006
CORROSION (2006) 62 (9): 801–810.
Citation
M.A. Hill, R.S. Lillard; Methods for Accessing Pitting Damage in Carbon Steel Exposed to Alkaline Chloride Waste Environments. CORROSION 1 September 2006; 62 (9): 801–810. https://doi.org/10.5006/1.3278305
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