Effects of nitrogen on the passivity of Fe–20Cr alloy

Effect of grain refinement and electrochemical nitridation on corrosion resistance of the 316L stainless steel for bipolar plates in PEMFCs environment

“…The MotteSchottky analysis also revealed that the Fee20Cre1.1N alloy contained higher Cr 6þ and lower Cr 3þ vacancy concentrations in the passive film than Fee20Cr alloy. The high valence state oxides and low vacancy concentration improved corrosion resistance of the alloy [23]. Shen et al [24] also found that the donor and acceptor concentrations in passive film on the surface of 316LN stainless steels decreased with increasing of nitrogen content.…”

“…Comparing with untreated samples, electrochemically nitrided samples have lower donor concentrations in passive films, especially for nanocrystalline sample in the cathode environment. In situ electrochemical techniques showed that the nitrogen was incorporated in the form of (Fe, Cr)-nitrides in the passive film of Fee20Cr alloy and the chromium content in the passive film increased with the increasing of nitrogen content [23]. The MotteSchottky analysis also revealed that the Fee20Cre1.1N alloy contained higher Cr 6þ and lower Cr 3þ vacancy concentrations in the passive film than Fee20Cr alloy.…”

Influence of the shielding gas composition on the passive film and erosion corrosion of tube-to-tube sheet welds of hyper duplex stainless steel

“…In the previous reports, the nitrogen retards the anodic dissolution or the oxidation of Fe, and lowered the passive current density [39]. In the presence of nitrogen,…”

Improvement of corrosion resistance of austenitic stainless steels by means of glow-discharge nitriding

“…Due to the increasing use of N-bearing and high-N stainless steels, the effects of N on corrosion have been the subject of intensive research (Lo et al 2009;Mudali & Ningshen, 2004). In regards to the general corrosion of these steels, reports have been made on both the positive (Ha, Jang, Kwon, & Kim, 2009;H ä nninen et al, 2001;Lee & Yoon, 2010;Truman, 1989) and negative (Belfrouh et al, 1996;Zagorski & Doraczynska, 1976) effects of N. The role of N can be benefi cial if localised corrosion phenomena occur (Jargelius-Pettersson, 1999;Kamachi Mudali & Dayal, 2000;Lo et al 2009;Mudali & Ningshen, 2004;Simmons, 1996). In 1991, Speidel suggested that the effect of N was more important than Cr and the pitting potential increases linearly with N concentration.…”