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ISRN Corrosion
Volume 2013 (2013), Article ID 506759, 10 pages
http://dx.doi.org/10.1155/2013/506759
Research Article

Corrosion of WC-VC-Co Hardmetal in Neutral Chloride Containing Media

1Council for Scientific and Industrial Research (CSIR), Materials Science and Manufacturing, P.O. Box 395, Pretoria 0001, South Africa
2DST/NRF Centre of Excellence in Strong Materials, and School of Chemical and Metallurgical Engineering, University of Witwatersrand, Johannesburg, Wits 2050, South Africa
3Materials Science and Engineering Department, University of Ghana, Legon, Accra, Ghana
4School of Research, Enterprise and Innovation, Manchester Metropolitan University, Oxford Road, Manchester M1 5GD, UK
5School of Science and the Environment, Manchester Metropolitan University, Oxford Road, Manchester M1 5GD, UK
6School of Chemistry, University of the Witwatersrand, Johannesburg, Private Bag X3, Wits 2050, South Africa

Received 29 November 2012; Accepted 20 December 2012

Academic Editors: G. Marginean and R. Wang

Copyright © 2013 C. N. Machio et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The effect of varying VC content on the corrosion behavior of WC-10 wt% Co hardmetals in sodium chloride (NaCl) and synthetic mine water (SMW) solutions has been investigated using anodic polarization scans and surface analytical methods. It is shown that the polarization behavior is active-pseudopassive in NaCl and active in SMW regardless of the VC content, while the corrosion resistance is poorer and independent of VC content in NaCl but better at high VC contents in SMW. The corrosion behavior of samples is explained using the effect of VC on the chemical composition of the binder.