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Kinetic analysis of direct current field enhanced salt bath nitriding

Abstract A novel rapid salt bath nitriding technology based on normal salt bath nitriding was primarily developed by additionally applying a direct current field (DCF) of 7·5 V between the treated samples, and the corresponding kinetics was investigated. The results showed that DCF could significantly enhance the nitriding efficiency, shorten the holding duration and decrease the treatment temperature. Meanwhile, the diffusion coefficient of nitrogen was increased about two times, and the activation energy was decreased from 184 to 159 kJ mol− 1. The main enhancement mechanism was discussed as well.