Application of chemical imaging sensor to in-situ pH imaging in the vicinity of a corroding metal surface

Ko Ichiro Miyamoto, Sakura Sakakita, Torsten Wagner, Michael J. Schöning, Tatsuo Yoshinobu

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

The chemical imaging sensor was applied to in-situ pH imaging of the solution in the vicinity of a corroding surface of stainless steel under potentiostatic polarization. A test piece of polished stainless steel was placed on the sensing surface leaving a narrow gap filled with artificial seawater and the stainless steel was corroded under polarization. The pH images obtained during polarization showed correspondence between the region of lower pH and the site of corrosion. It was also found that the pH value in the gap became as low as 2 by polarization, which triggered corrosion.

Original languageEnglish
Pages (from-to)137-142
Number of pages6
JournalElectrochimica Acta
Volume183
DOIs
Publication statusPublished - 2015 Nov 20

Keywords

  • Chemical imaging sensor
  • crevice corrosion
  • in-situ pH imaging

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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