TY - JOUR
T1 - Corrosion resistance of a free-cutting soft-magnetic stainless steel in pure water
AU - Sugawara, Yu
AU - Naruse, Tatsuya
AU - Ebata, Takashi
AU - Muto, Izumi
AU - Hara, Nobuyoshi
N1 - Publisher Copyright:
© 2015 The Japan Institute of Metals and Materials.
PY - 2015
Y1 - 2015
N2 - The corrosion resistance of a new free-cutting soft-magnetic stainless steel containing Ti4C2S2 instead of MnS was examined by immersion corrosion tests in pure water and anodic polarization measurements in 0.1M Na2SO4. The Ti4C2S2 inclusions hardly dissolved in pure water at 353K and did not suffer anodic dissolution in the passivity region of stainless steel in 0.1M Na2SO4. In contrast, conventional free-cutting softmagnetic stainless steels with (Mn,Cr)S inclusions caused the significant release of Mn species during immersion in pure water, and showed a marked increase in the dissolution current of MnS under anodic polarization in 0.1M Na2SO4. The thermodynamic stability of Ti, Mn and Cr oxide films on the inclusions makes the difference in the corrosion resistance of Ti4C2S2 and (Mn,Cr)S, with no dissolution of Ti from Ti4C2S2 and the selective dissolution of Mn from (Mn,Cr)S.
AB - The corrosion resistance of a new free-cutting soft-magnetic stainless steel containing Ti4C2S2 instead of MnS was examined by immersion corrosion tests in pure water and anodic polarization measurements in 0.1M Na2SO4. The Ti4C2S2 inclusions hardly dissolved in pure water at 353K and did not suffer anodic dissolution in the passivity region of stainless steel in 0.1M Na2SO4. In contrast, conventional free-cutting softmagnetic stainless steels with (Mn,Cr)S inclusions caused the significant release of Mn species during immersion in pure water, and showed a marked increase in the dissolution current of MnS under anodic polarization in 0.1M Na2SO4. The thermodynamic stability of Ti, Mn and Cr oxide films on the inclusions makes the difference in the corrosion resistance of Ti4C2S2 and (Mn,Cr)S, with no dissolution of Ti from Ti4C2S2 and the selective dissolution of Mn from (Mn,Cr)S.
KW - Anodic polarization curve
KW - Corrosion resistance
KW - Free-cutting soft-magnetic stainless steel
KW - MnS
KW - Pure water
KW - TiCS
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U2 - 10.2320/matertrans.M2015222
DO - 10.2320/matertrans.M2015222
M3 - Article
AN - SCOPUS:84945540189
SN - 1345-9678
VL - 56
SP - 1814
EP - 1820
JO - Materials Transactions
JF - Materials Transactions
IS - 11
ER -