Visualization of solution chemistry inside crevice by pH and pCl sensing plates

Takefumi Kaji, Toshiya Sekiai, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Both pH and pCl sensing plates were fabricated using ethyl violet (pH indicator) and quinine sulfate (fluorescent dye for pCl indicator). The sensing plates were also used for crevice formers. The crevice corrosion for 18Cr-10Ni-5.5Mn stainless steel was studied at 0.3 V (vs. Ag/AgCl, 3.33 M KCl) in 0.01 M NaCl solution (pH 3.0, 298 K). The pH inside the crevice gradually decreased with time, whereas chloride ion concentration did not change. An etch pit was initiated inside the crevice at the pH of 1.7 and the chloride ion concentration of 0.007 M. Just after the etch pit initiation, the pH of the surrounding area of the pit suddenly decreased to 0.4, the chloride ion concentration sharply increased to above 4 M. The dissolved metal ions from the etch pit led to increased acidification, and then the depassivation of the steel matrix occurred.

Original languageEnglish
Title of host publicationCritical Factors in Localized Corrosion 7
Pages205-216
Number of pages12
Edition25
DOIs
Publication statusPublished - 2012
Event7th Symposium on Critical Factors in Localized Corrosion - 220th ECS Meeting - Boston, MA, United States
Duration: 2011 Oct 102011 Oct 13

Publication series

NameECS Transactions
Number25
Volume41
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

Other7th Symposium on Critical Factors in Localized Corrosion - 220th ECS Meeting
CountryUnited States
CityBoston, MA
Period11/10/1011/10/13

ASJC Scopus subject areas

  • Engineering(all)

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