Electrochemical hydrogen permeation test under controlled temperature and humidity after outdoor exposure at Beijing, Chongqing and Okinawa

Eiji Akiyama, Songjie Li, Hideki Katayama, Boping Zhang, Kai Zhao, Wataru Oshikawa

Research output: Contribution to journalArticlepeer-review

Abstract

Electrochemical hydrogen permeation tests were carried out under controlled temperature and humidity using pure Fe sheet specimens outdoor-exposed at Beijing and Chongqing, China and Okinawa, Japan in order to understand the effect of environmental factors on hydrogen uptake behavior. The maximum hydrogen permeation current densities of the exposed specimens were in the order of Beijing > Chongqing ≫ Okinawa, while the order of the degree of corrosion of the specimens was Okinawa > Chongqing ≫ Beijing. X-ray fluorescence analysis showed that the surface concentrations of sulfur on the Beijing- and Chongqing-exposed specimens were higher than that of the Okinawa-exposed specimens, whereas chlorine concentrations of the Beijing and Okinawa-exposed specimens were higher than that of the Chongqing-exposed specimen. Nitrate concentrations of Beijing- and Chongqing-exposed specimens evaluated using nitrate test strips were obviously higher than that of the Okinawa-exposed specimens. It is suggested that air pollutants such as SO2 and NO2 and particulate matters containing inorganic acid ions, likely sulfate and nitrate ions, and possibly organic acids contribute to acidification of rust layer leading to the enhanced hydrogen entry.

Original languageEnglish
Pages (from-to)93-100
Number of pages8
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume103
Issue number2
DOIs
Publication statusPublished - 2017

Keywords

  • Atmospheric corrosion
  • Corrosion
  • Delayed fracture
  • Electrochemical hydrogen permeation test
  • Hydrogen embrittlement

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

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