TY - JOUR
T1 - Electrochemical hydrogen permeation test under controlled temperature and humidity after outdoor exposure at Beijing, Chongqing and Okinawa
AU - Akiyama, Eiji
AU - Li, Songjie
AU - Katayama, Hideki
AU - Zhang, Boping
AU - Zhao, Kai
AU - Oshikawa, Wataru
N1 - Publisher Copyright:
© 2016 ISIJ.
PY - 2016
Y1 - 2016
N2 - 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 Chongqingexposed 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 surfate and nitrate ions, and possibly organic acids contribute to acidification of rust layer leading to the enhanced hydrogen entry.
AB - 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 Chongqingexposed 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 surfate and nitrate ions, and possibly organic acids contribute to acidification of rust layer leading to the enhanced hydrogen entry.
KW - Atmospheric corrosion
KW - Corrosion
KW - Delayed fracture
KW - Electrochemical hydrogen permeation test
KW - Hydrogen embrittlement
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U2 - 10.2355/isijinternational.ISIJINT-2015-275
DO - 10.2355/isijinternational.ISIJINT-2015-275
M3 - Article
AN - SCOPUS:84962135821
VL - 56
SP - 436
EP - 443
JO - Transactions of the Iron and Steel Institute of Japan
JF - Transactions of the Iron and Steel Institute of Japan
SN - 0915-1559
IS - 3
ER -