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

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

研究成果: Article査読

25 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)298-302
ページ数5
ジャーナルCorrosion Science
106
DOI
出版ステータスPublished - 2016 5 1

ASJC Scopus subject areas

  • 化学 (全般)
  • 化学工学(全般)
  • 材料科学(全般)

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