Measurement of pH gradients in the crevice corrosion of iron using a palladium hydride microelectrode

Ryan C. Wolfe, Konrad G. Weil, Barbara A. Shaw, Howard W. Pickering

Research output: Contribution to journalArticle

34 Scopus citations

Abstract

The study of localized corrosion is hindered by the inability to characterize electrolyte compositions inside crevices and pits during the corrosion process. This paper describes the development of a microelectrode system tor in situ monitoring of the pH in artificial crevices and small recesses. This system permits determination of the pH gradient inside a crevice, even in the presence of a pronounced potential drop. The pH sensor, consisting of a palladium hydride electrode, can be positioned at any desired depth into the crevice while observing the position of the passive to active transition. With increasing time of crevice corrosion, one finds a pronounced pH change in the crevice electrolyte. This work lends further insight toward understanding of crevice corrosion and other localized corrosion phenomena.

Original languageEnglish (US)
Pages (from-to)B82-B88
JournalJournal of the Electrochemical Society
Volume152
Issue number2
DOIs
StatePublished - Mar 17 2005

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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