SALT BATH OXINITRIDING OF GRAY CAST IRON

M. Ahmadi, M. Teimouri, M. Aliofkhazraee and S. M. Mousavi Khoee ()
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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

Surface Review and Letters (SRL), 2008, vol. 15, issue 05, 669-674

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%.

Keywords: Salt bath nitriding; oxinitriding; gray cast iron; corrosion (search for similar items in EconPapers)
Date: 2008
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DOI: 10.1142/S0218625X08011834

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