The effect of temperature oscillation on the passive corrosion properties of Alloy 22 |
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| Affiliation: | 1. Leibniz-Institute for Solid State and Materials Research IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany;2. Materials Testing, University of Kaiserslautern, Gottlieb-Daimler-Straße, D-67663 Kaiserslautern, Germany;3. Institute of Materials Science, Faculty of Mechanical Science and Engineering, TU Dresden, D-01062 Dresden, Germany;1. Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, Zhejiang Province, People’s Republic of China;2. School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan 243002, Anhui Province, People’s Republic of China |
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| Abstract: | A temperature-oscillating heated electrode technique (TOHET) was developed for investigating the temperature effect on the passive corrosion properties of Alloy 22 (UNS N06022, Ni–22Cr–13Mo–3W–3Fe), which has been selected as the corrosion-resistant material (CRM) of the waste package outer barrier for the high level nuclear waste (HLNW) repository at Yucca Mountain, NV, USA. Cyclic and potentiostatic polarization tests were conducted on a temperature-controlled hot surface of Alloy 22, which was immersed in simulated Yucca Mountain ground waters. The current recorded during cyclic polarization tests was sensitive to temperature changes when the temperature amplitude was greater than 2 °C. Corrosion potential increased from −293 mV to −256 mV (Ag/AgCl) when temperature was decreased from 102 °C to 72 °C. Current variation was also observed during a potentiostatic test at −150 mV over which temperature oscillated between 65 °C and 95 °C. The log–linear plot of passive current density vs. temperature exhibited a linear relationship. In summary, the TOHET method is a valuable technique for studying the effects of temperature on the corrosion rate of passive alloys. |
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