Corrosion resistance of chromium nitride and oxynitride layers produced under glow discharge conditions

The paper presents the results of investigations of the structure and corro sion resistance of chromium nitride, oxynitride and oxide layers produced o n steels by electrochemical chromium deposition combined with glow discharg e assisted nitriding, oxynitriding and oxydizing processes. The layers obta ined were of the types: CrN + Cr2N + Cr + (Cr,Fe); Cr2N + Cr + (Cr,Fe); CrN + Cr2N + Cr + (Cr,Fe)(7)C-3; Cr2N + Cr + (Cr,Fe)(7)C-3; Cr(N,O) + Cr + (Cr ,Fe)(7)C-3 and Cr2O3. The corrosion resistance of the layers is high and ca n be modified by changing the process parameters, such as the temperature a nd chemical composition of the gas atmosphere. (C) 2000 Elsevier Science S. A. All rights reserved.