Corrosion Behaviour of Modified HVOF Sprayed WC Based Cermet Coatings on Stainless Steel

Ward, L, Hinton, B, Gerrard, D and Short, K 2011, 'Corrosion Behaviour of Modified HVOF Sprayed WC Based Cermet Coatings on Stainless Steel', Journal of Minerals and Materials Characterisation Engineering, vol. 10, no. 11, pp. 989-1005.

Document type: Journal Article
Collection: Journal Articles

Title Corrosion Behaviour of Modified HVOF Sprayed WC Based Cermet Coatings on Stainless Steel
Author(s) Ward, L
Hinton, B
Gerrard, D
Short, K
Year 2011
Journal name Journal of Minerals and Materials Characterisation Engineering
Volume number 10
Issue number 11
Start page 989
End page 1005
Total pages 17
Publisher Scientific Research Publishing, Inc.
Abstract WC based cermet coatings have been considered as alternative replacements to the more traditional hard chrome plating for improved surface properties of aircraft landing gear. While these coatings are used in engineering applications requiring superior hardness and improved wear resistance, little is known about the corrosion resistance. In this study, three WC based composite coatings were deposited onto ferritic stainless steel substrates using high velocity oxy fuel (HVOF) technology. Salt spray testing and potentiodynamic scanning studies in a saline environment were conducted on the coatings. Characterisation of the coating structure, composition and morphology, was carried out, prior to and after corrosion testing, using optical microscopy, scanning electron microscopy and EDX elemental analysis. The results showed that poor corrosion performance was exhibited by all three coatings. This was attributed to the high levels of porosity and the presence of micro-cracks within the coatings, resulting in attack of the substrate directly by the saline environment and possible galvanic coupling effects between the substrate and the coating. Dissolution and / or erosion of specific phases within the coating, resulting in the formation of micro-channels and increased number / size of voids may have accelerated corrosion of the system.
Subject Materials Engineering not elsewhere classified
Keyword(s) HVOF
Salt Spray Testing
Potentiodynamic Scanning
DOI - identifier 10.4236/jmmce.2011.1011076
Copyright notice © 2011 JMMCE
ISSN 1539-2511
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