Corrosion properties of stainless steel 316L after energetic nitrogen insertion

ESCALADA LISANDRO; JOHANNA LUTZ; STEPHEN MÄNDL; DARINA MANOVA; H. NEWMANN; SIMISON SILVIA NOEMI

Niza

Congreso; E-MRS ICAM IUMRS 2011 Spring Meeting; 2011

While nitriding of austenitic stainless steel by formation of expanded austenite is known to lead to a hard and wear resistant surface layer, an upper temperature limit is established by the formation of CrN, negating the corrosion resistance. Nevertheless, even at lower temperatures a negative influence on the formation of the passivating surface oxide can be inferred, depending strongly on the processing conditions. Here, the results of low energy ion implantation and plasma immersion ion implantation in the temperature range between 350 and 450 °C are compared for processing times of up to 2 hours. While similar diffusion and surface hardness are obtained from both methods, up to 5 µm and 15 GPa, respectively, strong differences in the corrosion resistance, as measured by potentiodynamic polarisation were observed, indicating secondary effects due to energy deposition and stress accumulation.