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

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 degrees C and also at 520 degrees 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 degrees C had shown the best corrosion resistance. However, broad passivation region had been shown after nitriding at 450 degrees C. (C) 2020 The Authors. Published by Elsevier Ltd.

Automated summary

This study evaluated the corrosion resistance properties of low alloy steel after plasma nitriding at different temperatures, showing that nitriding at 520 degrees Celsius had the best corrosion resistance, while nitriding at 450 degrees Celsius resulted in a broad passivation region.