Estimation of potential distribution during crevice corrosion through analysis of i-v curves obtained by laps

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number2873
JournalSensors
Volume20
Issue number10
DOIs
Publication statusPublished - 2020 May 2

Keywords

  • Crevice corrosion
  • Crevice gap
  • LAPS
  • Light-addressable potentiometric sensor
  • Potential distribution

Fingerprint

Dive into the research topics of 'Estimation of potential distribution during crevice corrosion through analysis of i-v curves obtained by laps'. Together they form a unique fingerprint.

Cite this