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International Journal of Electrochemistry - Volume 2014 2014, Article ID 594871, 11 pages -

Research Article

Centre of Excellence in Strong Materials, School of Chemical and Metallurgical Engineering, University of the Witwatersrand Wits, Johannesburg 2050, South Africa

Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa

Division of Chemistry & Environmental Science, School of Science & the Environment, Manchester Metropolitan University, Manchester M15 6 BH, UK

Received 26 September 2013; Revised 8 January 2014; Accepted 9 January 2014; Published 27 February 2014

Academic Editor: Shengshui Hu

Copyright © 2014 J. H. Potgieter 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

Hardmetals possess excellent wear resistance, making them suitable alloys in several industrial applications. Mine waters with both dissolved chloride and sulphate salts can be severely corrosive and can limit the application of hardmetal tools in the mining industry. Ru additions to these alloys can refine and improve selected mechanical properties, but its influence on the corrosion resistance is unknown. A series of WC-Co-Ru alloys was evaluated in different chloride containing media to investigate their corrosion resistance. Standard electrochemical corrosion tests, chronoamperometric measurements, and surface analyses with Raman spectroscopy were conducted. An increasing amount of Ru improves the corrosion resistance of all the alloys. The effect is not as dramatic as that observed with stainless steels containing Ru in corrosive media. In both corrosive media Ru decreased the cathodic Tafel constant and has a retarding influence on the cathodic part of the corrosion reaction. Raman analyses indicated the presence of tungsten oxide, hydrated tungsten oxide compounds, and CoO and Co3O4 formed on the alloy surfaces during the corrosion process.





Autor: J. H. Potgieter, P. Olubambi, and S. S. Potgieter-Vermaak

Fuente: https://www.hindawi.com/



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