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Salt Bath Oxinitriding Of Gray Cast Iron

Author

Listed:
  • M. AHMADI

    (School of Metallurgy & Material Engineering, Faculty of Engineering, University of Tehran, Tehran, Iran)

  • M. TEIMOURI

    (Faculty of Mechanical Engineering, K.N. Toosi University of Technology, Tehran, Iran)

  • M. ALIOFKHAZRAEE

    (Department of Materials Engineering, Faculty of Engineering, University of Tarbiat Modares, Tehran, Iran)

  • S. M. MOUSAVI KHOEE

    (Department of Mining, Metallurgy & Petroleum Engineering, Amirkabir University of Technology, Tehran, Iran)

Abstract

Salt bath oxinitriding is a duplex surface treatment developed to improve tribological and corrosion properties of ferrous materials. In this research, gray cast iron samples were nitrided at the temperature range of 480°C–580°C, and then oxidized in an oxidative salt bath. The phase composition of surface layer was identified by X-ray diffraction. Using a microhardness tester, hardness of nitrided gray cast iron was measured. Corrosion behavior of treated (nitrided and oxinitrided) samples was evaluated using potentiodynamic polarization technique in 3.5%NaClsolution. XRD analyses indicate that the surface layer in nitrided and oxinitrided samples is composed of ε-iron nitride (Fe2-3N) and magnetite (Fe3O4), respectively. Results show that the corrosion resistance of gray cast iron can be improved up to 170%.

Suggested Citation

  • M. Ahmadi & M. Teimouri & M. Aliofkhazraee & S. M. Mousavi Khoee, 2008. "Salt Bath Oxinitriding Of Gray Cast Iron," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 15(05), pages 669-674.
    • Handle: RePEc:wsi:srlxxx:v:15:y:2008:i:05:n:s0218625x08011834
    DOI: 10.1142/S0218625X08011834
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