TY - GEN
T1 - Effect of Cr content on pit initiation behavior at MnS inclusions in Fe-Cr steels
AU - Asano, Shinpei
AU - Muto, Izumi
AU - Sugawara, Yu
AU - Hara, Nobuyoshi
N1 - Funding Information:
This work was supported by JSPS KAKENHI Grant Number JP15K14175 from the Japan Society for the Promotion of Science. This research was also supported by Japan Society and Technology Agency (JST) under Collaborative Research Based on Industrial Demand "Heterogeneous Structure Control: Towards Innovation Development of Metallic Structural Materials.
PY - 2017
Y1 - 2017
N2 - A microelectrochemical technique was applied to make clear the effect of Cr on the pit initiation behavior at MnS inclusions in Fe- Cr steels. MnS inclusions in Fe-5Cr, 12Cr, and 18Cr steels dissolved around 0 V (vs. Ag/AgCl, 3.33 M KCl), and their dissolution potential regions were independent of Cr contents in the steels. A stable pit was initiated at the inclusions around 0 V on Fe-5Cr and 12Cr in 0.1 M NaCl. In the case of Fe-5Cr, after the stable pit initiation, the surface dissolution was started from the pit. In contrast, no surface dissolution was observed on Fe-12Cr, even though the stable pit was generated. In micro-scale polarization, no stable pit was initiated at MnS inclusions on Fe-18Cr. Only metastable pitting was observed around 0 V. The repassivation ability of Fe-Cr alloys has an important role in the pitting events at MnS inclusions.
AB - A microelectrochemical technique was applied to make clear the effect of Cr on the pit initiation behavior at MnS inclusions in Fe- Cr steels. MnS inclusions in Fe-5Cr, 12Cr, and 18Cr steels dissolved around 0 V (vs. Ag/AgCl, 3.33 M KCl), and their dissolution potential regions were independent of Cr contents in the steels. A stable pit was initiated at the inclusions around 0 V on Fe-5Cr and 12Cr in 0.1 M NaCl. In the case of Fe-5Cr, after the stable pit initiation, the surface dissolution was started from the pit. In contrast, no surface dissolution was observed on Fe-12Cr, even though the stable pit was generated. In micro-scale polarization, no stable pit was initiated at MnS inclusions on Fe-18Cr. Only metastable pitting was observed around 0 V. The repassivation ability of Fe-Cr alloys has an important role in the pitting events at MnS inclusions.
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U2 - 10.1149/07527.0009ecst
DO - 10.1149/07527.0009ecst
M3 - Conference contribution
AN - SCOPUS:85020186288
T3 - ECS Transactions
SP - 9
EP - 20
BT - ECS Transactions
A2 - Hassel, A. W.
A2 - Azumi, K.
A2 - Habazaki, H.
A2 - Hebert, K.
PB - Electrochemical Society Inc.
T2 - Oxide Films: A Symposium in Honor of Masahiro Seo - PRiME 2016/230th ECS Meeting
Y2 - 2 October 2016 through 7 October 2016
ER -