Effects of non-metallic inclusions on the initiation of pitting corrosion in 11% Cr ferritic stainless steel examined by micro-droplet cell |
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| Authors: | Heon Young Ha Hyuk Sang Kwon |
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| Affiliation: | a Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 373-1, GuseongDong, YuseongGu, Daejeon 305-701, Republic of Korea
b School of Materials Science and Engineering, Chonnam National University, 300, YongbongDong, BukGu, Gwangju 500-757, Republic of Korea |
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| Abstract: | This paper explores the effects of non-metallic inclusions (NMIs) on the initiation of pitting corrosion in type 409L stainless steels refined by the argon oxygen decarburization (AOD) and vacuum oxygen decarburization (VOD) processes. The dominant NMIs in the AOD and VOD samples were (Ti, Ca)-oxides and Ti-nitrides, respectively. In-situ electrochemical noise (EN) and micro-electrochemical analyses were conducted to investigate quantitatively the inherent effects of the NMIs on the pitting corrosion of the alloys. Pitting corrosion was initiated mostly around the (Ti, Ca)-oxides in the AOD samples, while little such corrosion occurred around the Ti-nitrides in the VOD samples. In addition, the pitting resistance of the AOD samples increased with increasing Ti content and decreasing Ca content in the (Ti, Ca)-oxides. |
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| Keywords: | A Stainless steel A Non-metallic inclusion B Electrochemical noise analysis B Micro-droplet cell C Pitting corrosion |
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