Effect of Plastic Deformation on the Corrosion Behavior of a Super Duplex Stainless Steel

Neill C. Renton, Abdul Rezeg Alhoud, Wiliam F Deans

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The role of plastic deformation on the corrosion behavior of a 25Cr-7Ni super-duplex stainless steel (SDSS) in a 3.5 wt.% sodium chloride solution at 90 °C was investigated. Different levels of plastic strain between 4 and 16% were applied to solution annealed tensile specimens and the effect on the pitting potential measured using potentiodynamic electrochemical techniques. A nonlinear relationship between the pitting potential and the plastic strain was recorded, with 8 and 16% causing a significant reduction in average Ep, but 4 and 12% causing no significant change when compared with the solution-annealed specimens. The corrosion morphology revealed galvanic interaction between the anodic ferrite and the cathodic austenite causing preferential dissolution of the ferrite. Mixed potential theory and the changing surface areas of the two phases caused by the plastic deformation structures explain the reductions in pitting potential at certain critical plastic strain levels. End-users and manufacturers should evaluate the corrosion behavior of specific cold-worked duplex and SDSSs using their as-produced surface finishes when assessing in-service corrosion performance.
Original languageEnglish
Pages (from-to)436-444
Number of pages9
JournalJournal of Materials Engineering and Performance
Volume20
Issue number3
Early online date29 Jun 2010
DOIs
Publication statusPublished - Apr 2011

Keywords

  • pitting corrosion
  • galvanic corrosion
  • force microscopy
  • cold working
  • resistance
  • phases

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