화학공학소재연구정보센터
Applied Surface Science, Vol.431, 24-31, 2018
High temperature solution-nitriding and low-temperature nitriding of AISI 316: Effect on pitting potential and crevice corrosion performance
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. 0.45 wt%) and in a surface layer (up to approx. 13 wt%), respectively. Potentiodynamic polarization tests in a 0.1 M NaCl solution and crevice corrosion immersion tests in 3 wt% 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. (C) 2017 Elsevier B.V. All rights reserved.