Journal of Materials Science

, Volume 24, Issue 7, pp 2348–2352 | Cite as

Anodic polarization and corrosion of WC-Co hardmetals containing small amounts of Cr3C2 and/or VC

  • W. J. Tomlinson
  • N. J. Ayerst
Article

Abstract

The anodic polarization and corrosion properties of commercial WC-Co hardmetals with different grain sizes and containing small amounts of Cr3C2 and/or VC in acid (pH 2.8), acid/3% NaCl, and neutral 3% NaCl solutions, have been measured using potentiokinetic and linear polarization conductance techniques. An increase in grain size increased the passive current density. Small additions of Cr3C2 increased substantially the corrosion resistance. Small additions of VC had little effect on the corrosion resistance, but in the presence of small additions of Cr3C2 it reduced the beneficial effects of chromium.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    E. A. Almond,Mater. Design 7 (1986) 324.Google Scholar
  2. 2.
    Idem, Powder Metall. 25 (1982) 146.Google Scholar
  3. 3.
    S. Ekemar, L. Lindholm andT. Hartzell,Refractory and Hard Metals 1 (1982) 37.Google Scholar
  4. 4.
    E. Kny andL. Schmid,ibid. 6 (1987) 145.Google Scholar
  5. 5.
    M. H. Ghandehar,J. Electrochem. Soc. 127 (1980) 214.Google Scholar
  6. 6.
    J. B. Fink, S. A. Hoering andJ. L. Griffith,Wear 108 (1986) 97.Google Scholar
  7. 7.
    G. D. Mohan andB. E. Klamechi,ibid. 74 (1981) 85.Google Scholar
  8. 8.
    E. Mosher, L. Peterson andR. Skold,Mater. Perf. 25 (1987) 38.Google Scholar
  9. 9.
    M. G. Fontana, “Corrosion Engineering”, 3rd Edn (McGraw-Hill, New York, 1986) p. 502.Google Scholar
  10. 10.
    W. J. Tomlinson andC. R. Linzell,J. Mater. Sci. 23 (1988) 914.Google Scholar
  11. 11.
    R. D. Armstrong, A. E. Douglas andD. E. Keene,J. Electrochem. Soc. 118 (1971) 568.Google Scholar
  12. 12.
    J. M. West, “Basic corrosion and oxidation”, 2nd Edn (Ellis Horwood, Chichester, 1986) p. 85.Google Scholar
  13. 13.
    H. E. Exner,Int. Met. Rev. 4 (1979) 149.Google Scholar
  14. 14.
    T. Ohtsuka andN. Sato,J. Electrochem. Soc. 128 (1981) 2522.Google Scholar

Copyright information

© Chapman and Hall Ltd. 1989

Authors and Affiliations

  • W. J. Tomlinson
    • 1
  • N. J. Ayerst
    • 1
  1. 1.Department of MaterialsCoventry PolytechnicCoventryUK

Personalised recommendations