Abstract
The process of steel surface nitriding has been studied with a sample as an anode in an N 2H 2Ar abnormal glow discharge at a total gas pressure of 8 torr. The plasma was excited in a planar system consisting of a steel anode in the centre between two steel or molybdenum cathodes of the same size as the anode. The temperature of the nitrided sample was 550 °C. The sample surfaces modified by the nitriding process were characterized using X-ray diffraction and GDOS methods. Also, the depth profile of the microhardness of nitrided samples was measured. It was found that the microhardness profile obtained in the sample after anodic nitriding using steel cathodes was almost the same as that obtained under the same conditions using conventional cathodic nitriding process. Use of molybdenum cathodes in the anodic nitriding process resulted in a substantial increase (above 40%) in the microhardness of the steel samples.
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