Aspects of anodic plasma electrolytic polishing of nitrided steel

Steel surface can be polished after its plasma electrolytic nitriding using the same electrolyser. Medium carbon steel is nitrided in the aqueous solution containing ammonium chloride and ammonium nitrate under stationary heating at 750°C for 5 min. The surface roughness is shown to decrease from 4.5 to 1.9 µm due to plasma electrolytic polishing during 2 min using the mode of current interruption without changing the structure of the diffusion layers.