ELECTROCHEMICAL CARBONITRIDING OF 316L STAINLESS STEEL IN MOLTEN SALT SYSTEM

Yanjie Ren, Bo Xiao, Yaqing Chen, Jian Chen and Jianlin Chen
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Yanjie Ren: Department of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410076, P. R. China
Bo Xiao: Department of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410076, P. R. China
Yaqing Chen: Department of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410076, P. R. China
Jian Chen: Department of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410076, P. R. China
Jianlin Chen: Department of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410076, P. R. China

Surface Review and Letters (SRL), 2018, vol. 25, issue 03, 1-5

Abstract: This paper reports an electrochemical route for carbonitriding 316L stainless steel in molten salts. Carbonitriding process was accomplished in molten alkaline chloride (LiCl/KCl) with the addition of KNO2 at 480∘C using a three-electrode system in which a carbon sheet was the counter electrode. The carbonitriding layer of 316L stainless steel obtained by potentiostatic electrolysis was analyzed by several physical techniques. The results showed that a compact layer with a thickness of about 7μm formed after the treatment. According to X-ray diffraction analysis, chromium nitride and carbide formed on the surface of carbonitriding layer. The microhardness of the carbonitriding layer is HV 336, as compared to HV 265 for the substrate.

Keywords: Electrochemical carbonitriding; molten salts; 316L stainless steel (search for similar items in EconPapers)
Date: 2018
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DOI: 10.1142/S0218625X18500725

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