The corrosion behaviour of WC-VC-Co hardmetals in acidic media

The corrosion behaviour of WC-VC-Co hardmetals in acidic media

The effect of increasing vanadium carbide (VC) content on the corrosion behaviour of tungsten carbide – 10 wt% cobalt hardmetals was investigated in 1 M hydrochloric (HCl), and sulphuric (H 2SO 4) acids solutions. Increasing VC content makes the open circuit potential (OCP) in the test solutions mor...

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Veröffentlicht in:Corrosion science 2010-09, Vol.52 (9), p.3118-3125
Hauptverfasser: Konadu, D.S., Merwe, J. van der, Potgieter, J.H., Potgieter-Vermaak, S., Machio, C.N.
Format: Artikel
Sprache:eng
Schlagworte:
A. WC-Co
A. WC-VC-Co
Applied sciences
B. Polarization
B. Raman spectroscopy
B. XRD
C. Passivity
Cemented carbides
Cobalt
Corrosion
Corrosion effects
Corrosion environments
Current density
Exact sciences and technology
Hydrochloric acid
Metals. Metallurgy
Open circuit potential
Sulfates
Tungsten oxides
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Zusammenfassung:The effect of increasing vanadium carbide (VC) content on the corrosion behaviour of tungsten carbide – 10 wt% cobalt hardmetals was investigated in 1 M hydrochloric (HCl), and sulphuric (H 2SO 4) acids solutions. Increasing VC content makes the open circuit potential (OCP) in the test solutions more negative than the base alloy. Specimens exhibited pseudo passivation in all the test solutions. Increasing VC led to decreasing corrosion current density. However, the corrosion current densities during chronoamperometric tests were lower for 0 wt% VC. XRD and Raman spectroscopy showed that hydrated WO 3 formed in the surface films of all specimens in hydrochloric acid (HCl), while hydrated vanadyl sulphate also formed for higher VC content specimens in sulphuric acid (H 2SO 4).
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2010.05.033