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- W1931492058 abstract "One of the important characteristics of dealloying systems is the location of the critical potential which marks the transition from a passivated alloy surface to the sustained formation of a bicontinuous porous structure. A steady-state method for accurately determining the dealloying critical potential is compared with the more traditional approach of extrapolation from anodic polarization data. Misinterpretation in the literature of short-term potential hold data is discussed in light of these results. The dealloying critical potentials for and were 0.80, 0.94, and 1.01 V (normal hydrogen electrode), respectively. The polarization data is shown to overestimate these values by 100 mV. Morphological investigations confirm the presence of porosity for a potential hold only 10 mV above the critical potential. For alloys with compositions between 70-80 atom % Ag, the critical potential increased by 20 mV per atom % decrease in the Ag composition. Long-term current fluctuations were observed during the potential hold experiments that suggest the presence of a surface corrosion instability occurring over 1-5% of the total surface area. © 2005 The Electrochemical Society. All rights reserved." @default.
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- W1931492058 date "2005-01-01" @default.
- W1931492058 modified "2023-10-18" @default.
- W1931492058 title "Probing the Dealloying Critical Potential" @default.
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- W1931492058 doi "https://doi.org/10.1149/1.1848351" @default.
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