TY - GEN
T1 - Microscopic polarization behavior of cerium sulfide inclusions in stainless steel
AU - Nishimoto, Masashi
AU - Muto, Izumi
AU - Sugawara, Yu
AU - Hara, Nobuyoshi
N1 - Funding Information:
This work was partially supported by a Grant-in-Aid for Challenging Exploratory Research (KAKENHI) from the Japan Society for the Promotion of Science (JSPS), grant No. 15K14175. This work was supported in part by MD program "Interdepartmental Doctoral Degree Program for Multi-dimensional Materials Science Leaders, Tohoku University". MEXT, Japan.
PY - 2016
Y1 - 2016
N2 - Microelectrochemical measurements and thermodynamic calculations were conducted to elucidate the electrochemical properties of CeS inclusions, and the relationship between those properties and pitting corrosion resistance was discussed. CeS inclusions containing ca. 20 at% Cr, (Ce,Cr)S, had better pitting corrosion resistance than (Mn,Cr)S inclusions. The pit initiation at the (Ce,Cr)S inclusion occurred at high potentials, outside the potential range in which the inclusion dissolved. On the other hand, in the case of (Mn,Cr)S inclusions, the pits were initiated in the dissolution potential range of the inclusions. Sulfur species and Ce3+ ions were estimated as the dissolution products from the (Ce,Cr)S inclusions. Stable pit initiation at the (Mn,Cr)S inclusions was inhibited in the Ce3+-containing NaCl solutions, implying that the Ce3+ ions released from (Ce,Cr)S inclusions improve pitting corrosion resistance.
AB - Microelectrochemical measurements and thermodynamic calculations were conducted to elucidate the electrochemical properties of CeS inclusions, and the relationship between those properties and pitting corrosion resistance was discussed. CeS inclusions containing ca. 20 at% Cr, (Ce,Cr)S, had better pitting corrosion resistance than (Mn,Cr)S inclusions. The pit initiation at the (Ce,Cr)S inclusion occurred at high potentials, outside the potential range in which the inclusion dissolved. On the other hand, in the case of (Mn,Cr)S inclusions, the pits were initiated in the dissolution potential range of the inclusions. Sulfur species and Ce3+ ions were estimated as the dissolution products from the (Ce,Cr)S inclusions. Stable pit initiation at the (Mn,Cr)S inclusions was inhibited in the Ce3+-containing NaCl solutions, implying that the Ce3+ ions released from (Ce,Cr)S inclusions improve pitting corrosion resistance.
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U2 - 10.1149/07552.0027ecst
DO - 10.1149/07552.0027ecst
M3 - Conference contribution
AN - SCOPUS:85025153197
T3 - ECS Transactions
SP - 27
EP - 34
BT - General Student Poster Session
A2 - Pharkaya, P.
A2 - Sugimoto, W.
A2 - Yoon, W.-S.
A2 - Chaitanya, V.
A2 - Sundaram, K.
A2 - Suroviec, A. H.
A2 - Subramanian, V.
PB - Electrochemical Society Inc.
T2 - Symposium on General Student Poster Session - PRiME 2016/230th ECS Meeting
Y2 - 2 October 2016 through 7 October 2016
ER -