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Frontiers of Materials Science

ISSN 2095-025X

ISSN 2095-0268(Online)

CN 11-5985/TB

Postal Subscription Code 80-974

2018 Impact Factor: 1.701

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Front. Mater. Sci.    2015, Vol. 9 Issue (1) : 77-84    https://doi.org/10.1007/s11706-015-0273-0
RESEARCH ARTICLE
Effect of chromium content on microstructure and corrosion behavior of W--Cr--C coatings prepared on tungsten substrate
Yan JIANG,Jun-Feng YANG,Qian-Feng FANG()
Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
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Abstract

W--Cr--C coatings with different chromium contents (0--3 wt.%) were fabricated on the tungsten substrates by spark plasma sintering (SPS) method from the graphite and chromium mixed powders. SEM and XRD were exploited to analyze the effect of Cr contents on the microstructure of coatings. It was found that the abnormal hollow WC grains disappeared with addition of Cr less than 2%, and the microstructures were largely refined and densified. With further increase of Cr addition, the grains changed slightly but the densification was reduced. The most dense coating was achieved at 1 wt.% Cr. Corrosion behavior of the W--Cr--C coatings were investigated by impedance spectrum and potentiodynamic polarization tests. Results suggested that the W--1Cr--C coated W sample exhibited the lowest corrosion current density and highest corrosion potential due to the most densified microstructure, indicating that the addition of Cr at 1 wt.% was optimal for WC coating against corrosion.
Keywords spark plasma sintering (SPS)      corrosion resistance      electrochemical measurement      W--Cr--C coating     
Corresponding Author(s): Qian-Feng FANG   
Online First Date: 12 December 2014    Issue Date: 02 March 2015
 Cite this article:   
Yan JIANG,Jun-Feng YANG,Qian-Feng FANG. Effect of chromium content on microstructure and corrosion behavior of W--Cr--C coatings prepared on tungsten substrate[J]. Front. Mater. Sci., 2015, 9(1): 77-84.
 URL:  
https://academic.hep.com.cn/foms/EN/10.1007/s11706-015-0273-0
https://academic.hep.com.cn/foms/EN/Y2015/V9/I1/77
Fig.1  XRD patterns of W–Cr–C coatings with the Cr addition from 0.5% to 3%.
Fig.2  Surface images of (a) pure WC coating, (b) W–0.5%Cr–C coating, (c) W–1%Cr–C coating, (d) W–2%Cr–C coating, (e) W–3%Cr–C coating, and (f) the plates on the surface of W–3%Cr–C coating.
Fig.3  Grain size distribution of the W–Cr–C coatings.
Fig.4  Schematic diagram of solid-state reactions in the SPS process.
Fig.5  Polarization curves for W–Cr–C coatings.
Coating composition Ecorr /mV Icorr /(nA·cm-2) Passivation current density /(μA·cm-2)
WC–0Cr -151 [20] 400 [20] 13.5
WC–0.5%Cr -102 165 –
WC–1%Cr -77 81 –
WC–2%Cr -126 292 7
WC–3%Cr -107 283 4.8
Tab.1  Corrosion data for the W–Cr–C coatings in the active region
Fig.6  (a) Nyquist and (b) Bode-phase spectra for the W–Cr–C coatings.
Coating composition RS /(Ω·cm2) CPEp /(10-5 Ω-1·cm-2·s-n) np Rp /(Ω·cm2) CPEct /(10-5 Ω-1·cm-2·s-n) nct Rct /(104 Ω·cm2)
WC–0Cr 3.1 9.76 0.99 3.9 5.3 0.94 4.37
WC–0.5%Cr 6.2 – – – 4.6 0.94 15.42
WC–1%Cr 4.3 – – – 3.9 0.94 37.94
WC–2%Cr 4.1 16.9 0.96 5.3 8.5 0.93 5.91
WC–3%Cr 3.6 9.4 0.98 12.3 7.4 0.94 8.60
Tab.2  Fitting data from EIS for the W–Cr–C coatings
EDSenergy-dispersive X-ray spectroscopy
EISelectrochemical impedance spectroscopy
FESEMfield-emission scanning electron microscopy
SCEsaturated calomel electrode
SEMscanning electron microscopy
SPSspark plasma sintering
WCtungsten carbide
XRDX-ray diffraction
Tab.1  
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