Effect of delta ferrite on corrosion resistance of type 316L stainless steel in acidic chloride solution by micro-droplet cell
- Authors
- Kim, S.-Y.; Kwon, H.-S.; Kim, H.
- Issue Date
- 2007
- Publisher
- Trans Tech Publications Ltd
- Keywords
- Chloride solution; Delta-ferrite; Micro-droplet cell; Phase-equilibrium prediction
- Citation
- Solid State Phenomena, v.124-126, no.PART 2, pp.1533 - 1536
- Journal Title
- Solid State Phenomena
- Volume
- 124-126
- Number
- PART 2
- Start Page
- 1533
- End Page
- 1536
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/24208
- DOI
- 10.4028/3-908451-31-0.1533
- ISSN
- 1012-0394
- Abstract
- More than 2% δ-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 δ-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 δ-ferrite phase in an acidic chloride solution. The anodic polarization behavior in both active zone and passive zone was affected by δ-ferrite. The degradation of corrosion resistance in the low potential zone with δ-ferrite phase is due to the preferential dissolution of a matrix, γ phase. It is explained with the fact that the formation of δ-ferrite lowers the concentrations of chromium and molybdenum in γ 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 δ-ferrite phase.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Science and Technology > School of Materials Science and Engineering > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.