Microstructure and Corrosion Performance of Carbonitriding Layers on Cast Iron by Plasma Electrolytic Carbonitriding
2009; Institute of Physics; Volume: 26; Issue: 8 Linguagem: Inglês
10.1088/0256-307x/26/8/086805
ISSN1741-3540
AutoresPang Hua, Guohua Lv, Huan Chen, Xinquan Wang, Guling Zhang, Size Yang,
Tópico(s)Metal and Thin Film Mechanics
ResumoThe surface carbonitriding of cast iron is investigated in an aqueous solution of acetamide and glycerin. Microstructure, chemical and phase composition and corrosion performance of the carbonitriding layers are investigated by scanning electron microscopy, energy dispersive spectroscopy and x-ray diffraction, as well as potentiodynamic polarization testing. X-ray diffraction results show that the carbonitriding coatings are composed of martensite, austenite(γ-Fe), Fe2C, Fe3C, Fe5C2, FeN and ∊-Fe2−3N. After the plasma electrolytic carbonitriding treatment the corrosion resistance of cast iron is clearly improved compared to the substrate, and the coatings produced at 350 V for 30s give the best corrosion resistance.
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