High temperature solution-nitriding and low-temperature nitriding of AISI 316: Effect on pitting potential and crevice corrosion performance

Federico Bottoli, Morten Stendahl Jellesen, Thomas Lundin Christiansen, Grethe Winther, Marcel A. J. Somers*

*Corresponding author for this work

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Abstract

Stainless steels grade AISI 316 was subjected to high temperature solution nitriding and low-temperature nitriding in order to dissolve various amounts of nitrogen in the bulk (up to approx. 0.45wt%) and in a surface layer (up to approx. 13wt%), respectively. Potentiodynamic polarization tests in a 0.1M NaCl solution and crevice corrosion immersion tests in 3wt% FeCl3 solution were studied before and after the bulk and surface treatments.Nitrogen addition in the bulk proved to have a beneficial effect on the pitting resistance of the alloy. The formation of a zone of expanded austenite at the material surface through low-temperature nitriding resulted in a considerable improvement of the pitting potential and the crevice corrosion performance of the steels.
Original languageEnglish
JournalApplied Surface Science
Volume431
Pages (from-to)24-31
ISSN0169-4332
DOIs
Publication statusPublished - 2018

Keywords

  • Corrosion
  • Crevice corrosion
  • Expanded austenite
  • High nitrogen steel
  • High-temperature solution nitriding
  • Low-temperature nitriding
  • Pitting

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