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 language | English |
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Journal | Applied Surface Science |
Volume | 431 |
Pages (from-to) | 24-31 |
ISSN | 0169-4332 |
DOIs | |
Publication status | Published - 2018 |
Keywords
- Corrosion
- Crevice corrosion
- Expanded austenite
- High nitrogen steel
- High-temperature solution nitriding
- Low-temperature nitriding
- Pitting