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EFFECT OF NANO RARE EARTH ON CORROSION RESISTANCE OF THERMAL SPRAYED WC/12Co COATING

Author

Listed:
  • HONGXIA ZHOU

    (The College of Mechanical Engineering, Qinghai University, Xining 810016, P. R. China)

  • FAYAN ZHU

    (#x2020;Qinghai Institute of Salt Lake, Chinese Academy of Sciences, Xining 810008, P. R. China)

  • GUOJUN MA

    (The College of Mechanical Engineering, Qinghai University, Xining 810016, P. R. China)

  • CAIHONG XUE

    (The College of Mechanical Engineering, Qinghai University, Xining 810016, P. R. China)

  • YONGKANG HU

    (The College of Mechanical Engineering, Qinghai University, Xining 810016, P. R. China)

Abstract

Rare earth has been widely used in materials manufacturing to improve mechanical properties. In this paper, Nano-CeO2-modified WC/12Co coating with biomodal-sized WC was produced by using high speed oxygen flaming (HVOF) spraying technology. XRD phase analysis showed that the decarburization of WC in coating doped with nano-CeO2 was slighter than no-doped coating. Potentiodynamic polarization showed that the nano rare earth modifier had improved the corrosion resistance of WC/12Co coating. In addition, long-term immersion in 3.5wt.% NaCl solution was conducted and the surface morphologies after immersed 200h were observed to investigate the corrosion mechanisms. The results showed WC-12Co coatings with 2wt.% nano-CeO2 possessed better corrosion resistance and the one without nano rare earth was corroded seriously. The positive effect of CeO2 on corrosion resistance of WC/12Co coating can be attributed to the improvement of interfacial strength between Co binder phase and WC particles.

Suggested Citation

  • Hongxia Zhou & Fayan Zhu & Guojun Ma & Caihong Xue & Yongkang Hu, 2018. "EFFECT OF NANO RARE EARTH ON CORROSION RESISTANCE OF THERMAL SPRAYED WC/12Co COATING," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 25(06), pages 1-11, August.
    • Handle: RePEc:wsi:srlxxx:v:25:y:2018:i:06:n:s0218625x18501147
    DOI: 10.1142/S0218625X18501147
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