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

2 引用 (Scopus)

抄録

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.

元の言語English
ページ(範囲)495-501
ページ数7
ジャーナルNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
81
発行部数11
DOI
出版物ステータスPublished - 2017 9 25

Fingerprint

Atmospheric corrosion
metal surfaces
corrosion
Metals
Agar
Magnesium Chloride
Iron
iron
Water
water
Color
color
drying
Rain
humidity
Atmospheric humidity
Drying
chambers
atmospheres

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

これを引用

Development of measurement system for ph distribution on metal surface under atmospheric corrosion. / Hirohata, Youhei; Nishida, Kentaro; Haruna, Takumi; Noda, Kazuhiko.

:: Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, 巻 81, 番号 11, 25.09.2017, p. 495-501.

研究成果: Article

@article{325d6df21aac4e7a8ca0c00345bdcf37,
title = "Development of measurement system for ph distribution on metal surface under atmospheric corrosion",
abstract = "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.",
keywords = "Atmospheric corrosion, Iron surface, Ph distribution, Ph measurement system",
author = "Youhei Hirohata and Kentaro Nishida and Takumi Haruna and Kazuhiko Noda",
year = "2017",
month = "9",
day = "25",
doi = "10.2320/jinstmet.JAW201704",
language = "English",
volume = "81",
pages = "495--501",
journal = "Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals",
issn = "0021-4876",
publisher = "Japan Institute of Metals (JIM)",
number = "11",

}

TY - JOUR

T1 - Development of measurement system for ph distribution on metal surface under atmospheric corrosion

AU - Hirohata, Youhei

AU - Nishida, Kentaro

AU - Haruna, Takumi

AU - Noda, Kazuhiko

PY - 2017/9/25

Y1 - 2017/9/25

N2 - 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.

AB - 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.

KW - Atmospheric corrosion

KW - Iron surface

KW - Ph distribution

KW - Ph measurement system

UR - http://www.scopus.com/inward/record.url?scp=85033362282&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85033362282&partnerID=8YFLogxK

U2 - 10.2320/jinstmet.JAW201704

DO - 10.2320/jinstmet.JAW201704

M3 - Article

AN - SCOPUS:85033362282

VL - 81

SP - 495

EP - 501

JO - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals

JF - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals

SN - 0021-4876

IS - 11

ER -