Development of measurement system for ph distribution on metal surface under atmospheric corrosion

Youhei Hirohata, Kentaro Nishida, Takumi Haruna, Kazuhiko Noda

研究成果: Article査読

2 被引用数 (Scopus)


Thin water film is formed on metal surfaces that are exposed to the atmosphere. The conditions of this film change according to environmental factors, such as temperature, wind, and rainfall. Hence, it is difficult to investigate atmospheric corrosion on metal surfaces. This paper aimed to develop a measurement system for the pH distribution on a metal surface in simulated atmospheric envi-ronment. The surface pH distribution was measured with agar film including pH indicators and MgCl2. The pH indicators used were a universal indicator and an MR?BTB indicator. Agar film of 0.5 mm thickness was placed on an iron specimen. The specimen was set in a chamber with a relative humidity of 100% to prevent the agar film from drying out. The surface pH distribution was deter-mined from the color of the agar film with an RGB color model. The surface pH distribution on the iron showed that anodic reac-tions produced acidic regions and cathodic reactions produced basic regions. The observed phenomena were the same as that found under a water droplet which contained the pH indicator and MgCl2. Therefore, we conclude that the agar film could simulate thin water film in an atmospheric environment and allow measurement of the surface pH distribution on iron under atmospheric corro-sion.

ジャーナルNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
出版ステータスPublished - 2017 9月 25

ASJC Scopus subject areas

  • 凝縮系物理学
  • 材料力学
  • 金属および合金
  • 材料化学


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