Effect of Delta ferrite on corrosion resistance of type 316L stainless steel in acidic chloride solution by micro-droplet cell
- Authors
- Kim, Sung-Yu; Kwon, Hyuk-Sang; Kim, Heesan
- Issue Date
- 2007
- Publisher
- TRANS TECH PUBLICATIONS LTD
- Keywords
- chloride solution; delta-ferrite; micro-droplet cell; phase-equilibrium prediction
- Citation
- ADVANCES IN NANOMATERIALS AND PROCESSING, PTS 1 AND 2, v.124-126, pp.1533 - +
- Journal Title
- ADVANCES IN NANOMATERIALS AND PROCESSING, PTS 1 AND 2
- Volume
- 124-126
- Start Page
- 1533
- End Page
- +
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/29901
- DOI
- 10.4028/www.scientific.net/SSP.124-126.1533
- ISSN
- 1012-0394
- Abstract
- More than 2% delta-ferrite phase is presented in type 316L stainless steels due to improvement of hot workability or welding process. In order to clarify the mechanism on how the delta-ferrite affects the corrosion resistance, electrochemical tests in a micro-droplet cell were conducted and microstructures were analyzed by TEM-EDS and SEM-EDS. Especially, the micro-droplet cell was modified at our laboratory to observe the polarization behavior of delta-ferrite phase in an acidic chloride solution. The anodic polarization behavior in both active zone and passive zone was affected by delta-ferrite. The degradation of corrosion resistance in the low potential zone with delta-ferrite phase is due to the preferential dissolution of a matrix, gamma phase. It is explained with the fact that the formation of delta-ferrite lowers the concentrations of chromium and molybdenum in gamma phase. It is also confirmed by potentiostatic test, EDS analyses and phase-equilibrium prediction. In addition, the micro-droplet cell and EDS analysis reveled that the pitting potential in the neutral pH solution was affected by Ca containing inclusion rather than delta-ferrite phase.
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