Microprobe study of pH during the induction period preceding crevice corrosion

Ryan C. Wolfe, Howard W. Pickering, Barbara A. Shaw

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

Potential, pH, and their gradients are important parameters in determining the electrochemical reactivity of metals in crevices. Although an IR voltage alone can be responsible for the activation of crevice corrosion that occurs immediately, changes in pH may be necessary for crevice corrosion to occur in the delayed form of crevice corrosion. In cases where acidification forms an active peak in the polarization curve, pH, corrosion products, and electrode potential, E, inside the crevice play synergistic roles in determining the onset of crevice corrosion. This synergistic relationship is explored by measuring gradients in acidity, pH (x), and electrode potential, E (x), within crevices during the induction period preceding crevice corrosion of iron in 0.2 M Na2 S O4 +0.025 M K2 Cr O4 of pH 9.1. Crevice corrosion was found to initiate when the IR voltage caused the E (x) to have a value within the active peak of the polarization curve of the crevice electrolyte. The active peak formed due to acidification of the crevice electrolyte.

Original languageEnglish (US)
Pages (from-to)B25-B32
JournalJournal of the Electrochemical Society
Volume153
Issue number2
DOIs
StatePublished - Jan 20 2006

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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