Journal
SURFACE & COATINGS TECHNOLOGY
Volume 225, Issue -, Pages 47-57Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2013.03.015
Keywords
HVOF thermal spray; In-flight particle parameters; WC-CoCr; Coatings; Corrosion resistance; Hardness
Funding
- Spain's Ministerio de Ciencia e Innovacion [MAT2008-01261]
- GUTMAR S.A. company
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High-velocity oxy-fuel (HVOF) spray techniques can produce cermet coatings for applications that require corrosion resistant surfaces. The aim of this study was to investigate the influence of different oxygen/fuel ratios on velocity and temperature of flying particles and establish the effects on the coatings quality in relation to the corrosion behavior of HVOF WC-CoCr coating in a 0.1 N HCl. The results show that in-flight particle characteristics have a significant effect on the porosity, hardness and corrosion resistance. The highest corrosion resistance is obtained with those parameters that allow a sufficient melting of the agglomerates while minimizing the decarburization of the WC particles. (C) 2013 Elsevier B.V. All rights reserved.
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