Investigation of micro-scale abrasion-corrosion of WC-based sintered hardmetal and sprayed coating using in situ electrochemical current-noise measurements


Thakare, M.R., Wharton, J.A., Wood, R.J.W. and Menger, C. (2009) Investigation of micro-scale abrasion-corrosion of WC-based sintered hardmetal and sprayed coating using in situ electrochemical current-noise measurements. [in special issue: ICAP 2008] Wear, 267, (11), 1967-1977. (doi:10.1016/j.wear.2009.06.006).

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Description/Abstract

The micro-scale wear–corrosion interactions of WC-based sintered hardmetals and sprayed coatings are typically investigated by comparing the wear-rates in corrosive environments with neutral (pH 7) conditions and inferring electrochemical activity. However, for a greater understanding of the wear–corrosion interactions, there is a need to examine the repassivation kinetics during micro-abrasion tests under different pH conditions. This paper details in situ electrochemical current-noise measurements performed using a modified micro-abrasion tester to elucidate these wear–corrosion interactions for pH 7–13 conditions for sintered WC–5.7Co–0.3Cr and sprayed WC–10Co–4Cr specimens. Electrochemical measurements and SEM micrographs of worn surfaces are used to detail the degradation process. Discussion will focus on the wear–corrosion interactions present under neutral and alkaline conditions for sintered and sprayed specimens and the influence of microstructure on the electrochemical activity will be detailed.

Item Type: Article
Additional Information: National Centre for Advanced Tribology at Southampton (nCATS), Engineering Materials, School of Engineering Sciences, University of Southampton, Highfield, Southampton SO17 1BJ, UK
ISSNs: 0043-1648 (print)
Keywords: micro-scale, abrasion-corrosion, WC-based sintered hardmetal, sprayed coating, electrochemical current-noise measurements, National Centre for Advanced Tribology at Southampton, nCATS
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TP Chemical technology
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
ePrint ID: 65554
Date Deposited: 17 Aug 2009
Last Modified: 27 Mar 2014 18:46
URI: http://eprints.soton.ac.uk/id/eprint/65554

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