Simultaneous visualization of pH and Cl- distributions inside the crevice of stainless steel

Masashi Nishimoto; Junichiro Ogawa; Izumi Muto; Yu Sugawara; Nobuyoshi Hara

doi:10.1016/j.corsci.2016.01.028

Simultaneous visualization of pH and Cl^- distributions inside the crevice of stainless steel

Masashi Nishimoto, Junichiro Ogawa, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

Research output: Contribution to journal › Article › peer-review

26 Citations (Scopus)

Abstract

A sensing plate for the simultaneous measurements of pH and Cl^- concentration was fabricated. Terbium-dipicolinic acid complex (Tb-DPA) and quinine sulphate were used to measure the pH and Cl^- concentration, respectively. In the incubation period of the crevice corrosion, the pH inside the crevice gradually decreased from 3.0 to ca. 2.0, and the Cl^- concentration increases from 0.01 to ca. 0.18 M. The generation of the micro-pit led to a sharp decrease in pH to below 0.5 and an increase in the Cl^- concentration to above 4 M. This situation allowed the crevice corrosion to proceed without spontaneously stopping.

Original language	English
Pages (from-to)	298-302
Number of pages	5
Journal	Corrosion Science
Volume	106
DOIs	https://doi.org/10.1016/j.corsci.2016.01.028
Publication status	Published - 2016 May 1

Keywords

A. Stainless steel
B. Potentiostatic
C. Crevice corrosion

ASJC Scopus subject areas

Chemistry(all)
Chemical Engineering(all)
Materials Science(all)

Access to Document

10.1016/j.corsci.2016.01.028

Cite this

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title = "Simultaneous visualization of pH and Cl- distributions inside the crevice of stainless steel",

abstract = "A sensing plate for the simultaneous measurements of pH and Cl- concentration was fabricated. Terbium-dipicolinic acid complex (Tb-DPA) and quinine sulphate were used to measure the pH and Cl- concentration, respectively. In the incubation period of the crevice corrosion, the pH inside the crevice gradually decreased from 3.0 to ca. 2.0, and the Cl- concentration increases from 0.01 to ca. 0.18 M. The generation of the micro-pit led to a sharp decrease in pH to below 0.5 and an increase in the Cl- concentration to above 4 M. This situation allowed the crevice corrosion to proceed without spontaneously stopping.",

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T1 - Simultaneous visualization of pH and Cl- distributions inside the crevice of stainless steel

AU - Nishimoto, Masashi

AU - Ogawa, Junichiro

AU - Muto, Izumi

AU - Sugawara, Yu

AU - Hara, Nobuyoshi

PY - 2016/5/1

Y1 - 2016/5/1

N2 - A sensing plate for the simultaneous measurements of pH and Cl- concentration was fabricated. Terbium-dipicolinic acid complex (Tb-DPA) and quinine sulphate were used to measure the pH and Cl- concentration, respectively. In the incubation period of the crevice corrosion, the pH inside the crevice gradually decreased from 3.0 to ca. 2.0, and the Cl- concentration increases from 0.01 to ca. 0.18 M. The generation of the micro-pit led to a sharp decrease in pH to below 0.5 and an increase in the Cl- concentration to above 4 M. This situation allowed the crevice corrosion to proceed without spontaneously stopping.

AB - A sensing plate for the simultaneous measurements of pH and Cl- concentration was fabricated. Terbium-dipicolinic acid complex (Tb-DPA) and quinine sulphate were used to measure the pH and Cl- concentration, respectively. In the incubation period of the crevice corrosion, the pH inside the crevice gradually decreased from 3.0 to ca. 2.0, and the Cl- concentration increases from 0.01 to ca. 0.18 M. The generation of the micro-pit led to a sharp decrease in pH to below 0.5 and an increase in the Cl- concentration to above 4 M. This situation allowed the crevice corrosion to proceed without spontaneously stopping.

KW - A. Stainless steel

KW - B. Potentiostatic

KW - C. Crevice corrosion

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