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

Hongxia Zhou (), Fayan Zhu, Guojun Ma, Caihong Xue and Yongkang Hu
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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

Surface Review and Letters (SRL), 2018, vol. 25, issue 06, 1-11

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.

Keywords: Corrosion resistance; nano rare earth; WC/12Co coating; morphology (search for similar items in EconPapers)
Date: 2018
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DOI: 10.1142/S0218625X18501147

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