Relationship between corrosion rate of carbon steel and water film thickness under thin layer of artificial sea water

H. Katayama, Kazuhiko Noda, M. Yamamoto, T. Kodama

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

AC impedance method has been applied to atmospheric corrosion monitoring under thin film of artificial seawater. An atmospheric corrosion sensor, which consists of a pair of identical electrodes embedded concentrically in epoxy resin, was used for measuring the corrosion rates. The instaneous corrosion rates of carbon steel in the atmosphere of 60% to 95% Relative Humidity (RH) have been monitored by the continuous measurements of the impedance at 10 mHz and 10 kHz. The carbon steel under a thin water film including 0.1 kg/m2 salt showed the highest corrosion rate at 60%RH. Above 70%RH, however, the carbon steel under a liquid thin film including 0.01 kg/m2 salt gave the largest corrosion rate. The average thickness of a water film formed on the corrosion sensor was thermodynamically calculated by analyzing the drying and absorption processes of the artificial sea salt. The average thickness of water film formed on the corrosion sensor under film including 0.01 kg/m2 salt was 10∼100 μm above 70%RH. The corrosion rate of carbon steel showed a maximum at the average water film thickness of several 10 s of micrometers.

Original languageEnglish
Pages (from-to)298-302
Number of pages5
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume65
Issue number4
Publication statusPublished - 2001
Externally publishedYes

Fingerprint

sea water
carbon steels
Corrosion rate
Carbon steel
Film thickness
corrosion
film thickness
Atmospheric humidity
Salts
Water
Atmospheric corrosion
water
humidity
Sensors
salts
Corrosion
Epoxy Resins
Thin films
Liquid films
Seawater

Keywords

  • Alternating current impedance technique
  • Atmospheric corrosion
  • Corrosion monitoring
  • Relative humidity
  • Steel

ASJC Scopus subject areas

  • Metals and Alloys

Cite this

Relationship between corrosion rate of carbon steel and water film thickness under thin layer of artificial sea water. / Katayama, H.; Noda, Kazuhiko; Yamamoto, M.; Kodama, T.

In: Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, Vol. 65, No. 4, 2001, p. 298-302.

Research output: Contribution to journalArticle

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