Ion nitriding and nitrocarburising of stainless steels and its influence in the corrosion resistance
by L.C. Casteletti, A. Lombardi Neto, A.M. De Oliveira, G.E. Totten
International Journal of Microstructure and Materials Properties (IJMMP), Vol. 4, No. 4, 2009

Abstract: The objective of this work was to determine the most appropriate temperatures for ion nitriding and nitrocarburising of AISI 316L austenitic stainless steel and ASTM A 890 Gr 5A super-duplex stainless steel, respectively, and to determine its influence on the corrosion resistance of these steels. Samples of steels were treated at 400 C, 450°C and 500°C and characterised by optical microscopy, X-rays diffraction and corrosion tests. Layer thickness increased with the treatment temperature for both steels. Potentiodynamic corrosion tests showed that for both steels, the nitrided and nitrocarburised layers at 400°C yielded either similar or superior corrosion behaviours when compared to the substrate, which is due to austenite or expanded ferrite presence (S phase).

Online publication date: Tue, 02-Feb-2010

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