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Open AccessArticle

Estimation of Potential Distribution during Crevice Corrosion through Analysis of I–V Curves Obtained by LAPS

1
Material Performance Solution Center, Nippon Steel Technology Corporation, 20-1, Shintomi, Futtu 293-0011, Japan
2
Department of Electronic Engineering, Tohoku University, 6-6, Aza-Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan
3
Department of Biomedical Engineering, Tohoku University, 6-6, Aza-Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(10), 2873; https://doi.org/10.3390/s20102873
Received: 19 March 2020 / Revised: 12 May 2020 / Accepted: 14 May 2020 / Published: 19 May 2020
Crevice corrosion is a type of local corrosion which occurs when a metal surface is confined in a narrow gap on the order of 10 μm filled with a solution. Because of the inaccessible geometry, experimental methods to analyze the inner space of the crevice have been limited. In this study, a light-addressable potentiometric sensor (LAPS) was employed to estimate the potential distribution inside the crevice owing to the IR drop by the anodic current flowing out of the structure. Before crevice corrosion, the I–V curve of the LAPS showed a potential shift, depending on the distance from the perimeter. The shift reflected the potential distribution due to the IR drop by the anodic current flowing out of the crevice. After crevice corrosion, the corrosion current increased exponentially, and a local pH change was detected where the corrosion was initiated. A simple model of the IR drop was used to calculate the crevice gap, which was 12 μm—a value close to the previously reported values. Thus, the simultaneous measurement of the I–V curves obtained using a LAPS during potentiostatic electrolysis could be applied as a new method for estimating the potential distribution in the crevice. View Full-Text
Keywords: light-addressable potentiometric sensor; LAPS; crevice corrosion; potential distribution; crevice gap light-addressable potentiometric sensor; LAPS; crevice corrosion; potential distribution; crevice gap
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Nose, K.; Miyamoto, K.-I.; Yoshinobu, T. Estimation of Potential Distribution during Crevice Corrosion through Analysis of I–V Curves Obtained by LAPS. Sensors 2020, 20, 2873.

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