Journal of Materials Science

, Volume 26, Issue 6, pp 1605–1608 | Cite as

Corrosion, erosion-corrosion, and the flexural strength of WC-Co hardmetals

  • W. J. Tomlinson
  • I. D. Molyneux


The corrosion of commercial hardmetals containing 6, 8 and 10% Co with small additions of Cr3C2 and VC, in solutions of pH 1, 3, 5 and 10, and in a cutting fluid of pH 8.6, has been investigated using weight loss, atomic absorption spectroscopy, and metallographic techniques. For a surface area 420 mm2, at 20°C, the amount of cobalt dissolved in pH 5 and 10 solutions was less than 0.05 mg per day and in the cutting fluid was less than 0.05 mg in 7 days. Salt in the water increased the corrosion rate in the pH 10 solution by over five times. Corrosion was highest in the hardmetal containing VC. Corrosion in a pH 1 solution at 20 °C for 24 h (weight loss about 1 mg) did not affect the mean strength of the hardmetals. Erosion by alumina balls during corrosion increased the corrosion rate in the pH 1 solution by 16 to 29 times, formed a thick layer of WC denuded of cobalt, and reduced the strength of the eroded-corroded hardmetals by 0.54 to 0.76 times.


Polymer Alumina Spectroscopy Cobalt Atomic Absorption 
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Copyright information

© Chapman and Hall Ltd. 1991

Authors and Affiliations

  • W. J. Tomlinson
    • 1
  • I. D. Molyneux
    • 1
  1. 1.Department of MaterialsCoventry PolytechnicCoventryUK

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