TY - JOUR
T1 - Effect of iron rust on hydrogen uptake during steel corrosion under an aqueous NaCl droplet
AU - Saya, Ajito
AU - Eiji, Tada
AU - Azusa, Ooi
AU - Atsushi, Nishikata
N1 - Funding Information:
This work was performed as a part of the research “Corrosion-induced Hydrogen Absorption to Steels” with a financial support by The Iron and Steel Institute of Japan. In addition, this work was also supported by JSPS KAKENHI Grant Number 26289268.
Publisher Copyright:
© 2021 The Iron and Steel Institute of Japan.
PY - 2021
Y1 - 2021
N2 - The effect of iron rust on hydrogen uptake into steel during corrosion under an aqueous NaCl droplet was investigated. Pre-rusted steel was obtained by exposing a steel coupon to natural environmental conditions for 1 month at the Choshi site of the Japan Weathering Test Center. The iron rust that formed on the coupon was partly removed, and model rust/steel samples differing in the area ratios of rusted and bare steel were prepared. The hydrogen permeation current and the corrosion potential were simultaneously measured by Devanathan-Stachurski (DS) method and the Kelvin probe technique, respectively. As the applied droplet of aqueous NaCl dried, the corrosion potential shifted in the negative direction and the hydrogen permeation current slightly increased in all model samples. However, the corrosion potential and hydrogen permeation current did not differ substantially among the model samples once the rusted area of the model sample exceeded 50%. These results indicate that iron rust cause a positive shift in the corrosion potential, and hydrogen uptake was significantly suppressed due to the inhibition of the hydrogen evolution reaction. The hydrogen uptake behavior of the model sample is discussed with consideration of the cathodic reduction reaction of iron rust.
AB - The effect of iron rust on hydrogen uptake into steel during corrosion under an aqueous NaCl droplet was investigated. Pre-rusted steel was obtained by exposing a steel coupon to natural environmental conditions for 1 month at the Choshi site of the Japan Weathering Test Center. The iron rust that formed on the coupon was partly removed, and model rust/steel samples differing in the area ratios of rusted and bare steel were prepared. The hydrogen permeation current and the corrosion potential were simultaneously measured by Devanathan-Stachurski (DS) method and the Kelvin probe technique, respectively. As the applied droplet of aqueous NaCl dried, the corrosion potential shifted in the negative direction and the hydrogen permeation current slightly increased in all model samples. However, the corrosion potential and hydrogen permeation current did not differ substantially among the model samples once the rusted area of the model sample exceeded 50%. These results indicate that iron rust cause a positive shift in the corrosion potential, and hydrogen uptake was significantly suppressed due to the inhibition of the hydrogen evolution reaction. The hydrogen uptake behavior of the model sample is discussed with consideration of the cathodic reduction reaction of iron rust.
KW - Atmospheric corrosion
KW - Corrosion potential
KW - Devanathan-Stachurski method
KW - Electrochemical hydrogen permeation test
KW - Kelvin probe technique
KW - PH
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U2 - 10.2355/isijinternational.ISIJINT-2020-528
DO - 10.2355/isijinternational.ISIJINT-2020-528
M3 - Article
AN - SCOPUS:85105055338
VL - 61
SP - 1186
EP - 1193
JO - Transactions of the Iron and Steel Institute of Japan
JF - Transactions of the Iron and Steel Institute of Japan
SN - 0915-1559
IS - 4
ER -