TY - JOUR
T1 - A microelectrochemical approach to understanding hydrogen absorption into steel during pitting corrosion
AU - Sato, Naoto
AU - Takahashi, Tateru
AU - Muto, Izumi
AU - Omura, Tomohiko
AU - Sugawara, Yu
AU - Hara, Nobuyoshi
N1 - Publisher Copyright:
© 2016 ISIJ.
PY - 2016
Y1 - 2016
N2 - A small Devanathan-Stachurski cell was newly designed to ascertain the hydrogen absorption behavior into re-sulfurized carbon steel during pitting corrosion. In 0.1 M NaCl (pH 5.5), a pit was generated on a small area with MnS inclusions, the current of hydrogen permeation current increased sharply when the solution (capillary) was placed on the steel surface, and the current density returned to the background after the capillary was removed. On the other hand, no pitting was observed on the area without the inclusions, and no permeation current was also observed. The time variation of the permeation current density was measured in 0.1 M NaCl (pH 2.0) and boric-borate buffer with 1 mM NaCl (pH 5.5) solutions. The permeation current from a small area with MnS inclusions was large compared with that of an area without the inclusions. After the experiments, a deep pit was generated on the surface with the inclusions. MnS inclusions were likely to accelerate the steel dissolution and the hydrogen absorption into the steel.
AB - A small Devanathan-Stachurski cell was newly designed to ascertain the hydrogen absorption behavior into re-sulfurized carbon steel during pitting corrosion. In 0.1 M NaCl (pH 5.5), a pit was generated on a small area with MnS inclusions, the current of hydrogen permeation current increased sharply when the solution (capillary) was placed on the steel surface, and the current density returned to the background after the capillary was removed. On the other hand, no pitting was observed on the area without the inclusions, and no permeation current was also observed. The time variation of the permeation current density was measured in 0.1 M NaCl (pH 2.0) and boric-borate buffer with 1 mM NaCl (pH 5.5) solutions. The permeation current from a small area with MnS inclusions was large compared with that of an area without the inclusions. After the experiments, a deep pit was generated on the surface with the inclusions. MnS inclusions were likely to accelerate the steel dissolution and the hydrogen absorption into the steel.
KW - Carbon steel
KW - Hydrogen absorption
KW - Microelctrochemical cell
KW - MnS inclusion
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U2 - 10.2355/isijinternational.ISIJINT-2015-307
DO - 10.2355/isijinternational.ISIJINT-2015-307
M3 - Article
AN - SCOPUS:84962185131
VL - 56
SP - 495
EP - 497
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 -