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

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

研究成果: Conference contribution

1 被引用数 (Scopus)

抄録

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.

本文言語English
ホスト出版物のタイトルCritical Factors in Localized Corrosion 7
ページ205-216
ページ数12
25
DOI
出版ステータスPublished - 2012
イベント7th Symposium on Critical Factors in Localized Corrosion - 220th ECS Meeting - Boston, MA, United States
継続期間: 2011 10 102011 10 13

出版物シリーズ

名前ECS Transactions
番号25
41
ISSN(印刷版)1938-5862
ISSN(電子版)1938-6737

Other

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

ASJC Scopus subject areas

  • 工学(全般)

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