TY - GEN
T1 - Visualization of solution chemistry inside crevice by pH and pCl sensing plates
AU - Kaji, Takefumi
AU - Sekiai, Toshiya
AU - Muto, Izumi
AU - Sugawara, Yu
AU - Hara, Nobuyoshi
PY - 2012
Y1 - 2012
N2 - 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.
AB - 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.
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U2 - 10.1149/1.3697590
DO - 10.1149/1.3697590
M3 - Conference contribution
AN - SCOPUS:84879710102
SN - 9781607683247
T3 - ECS Transactions
SP - 205
EP - 216
BT - Critical Factors in Localized Corrosion 7
T2 - 7th Symposium on Critical Factors in Localized Corrosion - 220th ECS Meeting
Y2 - 10 October 2011 through 13 October 2011
ER -