Effects of plasma nitriding on low alloy Cr-Mo-V steel

Kalimi Trinadh (1) , Corinne Nouveau (2) , K. Ram Mohan Rao (3, 1)

1 GITAM Institute of Science - Department of Chemistry
2 LABOMAP - Laboratoire Bourguignon des Matériaux et Procédés
3 Department of Chemistry

In this study the effects on resistance to corrosion of a low alloy steel after plasma nitriding has been reported. Nitriding was performed at a low temperature of 450 °C and also at 520 °C for the same duration of 10 h in the plasma of nitrogen and hydrogen (80:20) gas mixture. Sample holder was biased at -250 V and the working pressure was kept at around 500 Pa. After nitriding the steel samples along with the bare steel were exposed to X-ray diffraction (XRD) to understand the phase formation. For the assessment of corrosion resistance properties potentiodynamic polarization tests of the bare and plasma nitrided steels in 3.5% NaCl electrolyte were performed. Nitriding at 520 °C had shown the best corrosion resistance. However, broad passivation region had been shown after nitriding at 450 °C.

Mots clés: X-ray diffraction; Corrosion; Plasma; Polarization; Steel

Domaines: Sciences de l'ingénieur [physics]

Kalimi Trinadh, Corinne Nouveau, K. Ram Mohan Rao. Effects of plasma nitriding on low alloy Cr-Mo-V steel. Materials Today: Proceedings, 2021, 40 (supplement 1), pp.S79-S82. ⟨10.1016/j.matpr.2020.03.720⟩. ⟨hal-03187989⟩