Abstract
The present study concerns improving the corrosion resistance of a low alloy–high carbon steel by plasma nitriding in pulsed direct current glow discharge mode at an applied voltage of 540–710 V with 3–6 A current in the temperature range 450–560 °C for a time period of 1–5 h. The phases formed after nitriding is mostly γ′-Fe 4N with a small volume fraction of ε-Fe 3N/Fe 2N. Nitride volume fraction increases with nitriding time and temperature. Corrosion study reveals that plasma nitriding significantly improves the corrosion resistance in terms of corrosion potential, corrosion current density and resistance to polarization. This improvement is attributed to both formation of solid solution and nitrides on the surface.
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