Structural features of the external oxide layer and internal nitrided, carbonitrided and carburized layers in steels 10, 20 and St3 produced by the method of electrolytic plasma treatment are studied. Specimens of the steels are tested for corrosion in a naturally aerated 1-N solution of sodium chloride. The condition of the metal/sodium chloride solution interface is studied by the method of electrochemical impedance spectroscopy. It is shown that the corrosion resistance of low-carbon steels can be raised by anode electrolytic-plasma saturation with nitrogen and carbon. Recommendations are given on the choice of carbonitriding modes for structural steels.
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Here and below in the paper the content of elements is given in mass percent.
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The study has been performed with financial support of the Russian Scientific Foundation (Project No. 15-13-10018) to the Kostroma State University (nitriding, carburizing and nitrocarburizing of specimens, structural and phase analysis of the modified layers, participation in the discussion of the results, and preparation of the paper) and of the Ministry of Education and Science of the Russian Federation (Project No. 855).
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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 2, pp. 52 – 59, February, 2017.
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Kusmanov, S.A., Grishina, E.P., Belkin, P.N. et al. Raising the Corrosion Resistance of Low-Carbon Steels by Electrolytic-Plasma Saturation with Nitrogen and Carbon. Met Sci Heat Treat 59, 117–123 (2017). https://doi.org/10.1007/s11041-017-0114-0
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DOI: https://doi.org/10.1007/s11041-017-0114-0