Simultaneous In Situ Imaging of pH and Surface Roughening during the Progress of Crevice Corrosion of Stainless Steel

Ko Ichiro Miyamoto, Rinya Hiramitsu, Carl Frederik Werner, Tatsuo Yoshinobu

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Stainless steel plays an important role in industry due to its anti-corrosion characteristic. It is known, however, that local corrosion can damage stainless steel under certain conditions. In this study, we developed a novel measurement system to observe crevice corrosion, which is a local corrosion that occurs inside a narrow gap. In addition to pH imaging inside the crevice, another imaging technique using an infrared light was combined to simultaneously visualize surface roughening of the test piece. According to experimental results, the lowering of local pH propagated inside the crevice, and after that, the surface roughening started and expanded due to propagation of corrosion. The real-time measurement of the pH distribution and the surface roughness can be a powerful tool to investigate the crevice corrosion.

Original languageEnglish
Article number2246
JournalSensors
Volume22
Issue number6
DOIs
Publication statusPublished - 2022 Mar 1

Keywords

  • Chemical sensor
  • Crevice corrosion
  • Light-addressable potentiometric sensor
  • PH imaging
  • Stainless steel

ASJC Scopus subject areas

  • Analytical Chemistry
  • Information Systems
  • Atomic and Molecular Physics, and Optics
  • Biochemistry
  • Instrumentation
  • Electrical and Electronic Engineering

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