Title: Tribocorrosion behaviour of cemented carbide coatings obtained by high velocity oxygen fuel spraying

Authors: Miguel Ángel Reyes-Mojena; Roberto Sagaro-Zamora; Hipólito Domingo Carvajal Fals; Valtair Antonio Ferraresi; Carlos Roberto Camello Lima

Addresses: Oriente University, Ave 'Las Américas', CP 90900, Santiago de Cuba, Cuba ' Oriente University, Ave 'Las Américas', CP 90900, Santiago de Cuba, Cuba ' Oriente University, Ave 'Las Américas', CP 90900, Santiago de Cuba, Cuba ' Federal University of Uberlândia, Av. João Naves de Ávila, 2121, Uberlândia, MG, Brazil ' Methodist University of Piracicaba, Rod. Luis Ometto, km 24, Santa Bárbara d’Oeste, SP, Brazil

Abstract: Erosion-corrosion experiments on carbide coatings were conducted to quantify the contributions of erosion and corrosion components to the total wear weight loss. WC-17Co, WC-12Co and Cr₃C₂-25NiCr coatings were deposited by HP-HVOF spray onto steel substrate. Wear-corrosion tests were carried out in a rotatory tribometer. The main degradation mechanisms were evaluated by electrochemical methods and SEM. Erosion-corrosion tests showed that all of the sprayed coatings were strongly affected by the action of the erosive agent in the liquid media combining wear and corrosion. The main degradation forms were dissolution of the binder matrix at the hard phase/matrix interface followed with pulling out of the carbides. Cr₃C₂ coatings were found to possess the lowest wear resistance among all the tested coatings.

Keywords: tribocorrosion; carbides; erosion; corrosion; HVOF; cemented carbide coatings; high velocity oxygen fuel spraying; wear weight loss; steel substrates; sprayed coatings; wear resistance.

DOI: 10.1504/IJSURFSE.2015.072835

International Journal of Surface Science and Engineering, 2015 Vol.9 No.6, pp.561 - 573

Received: 08 Apr 2014
Accepted: 30 Oct 2014
Published online: 04 Nov 2015 *

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