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Metallic Materials Vol. 48 (2010), no. 3, pp. 203 - 210

Title: A study on wear and corrosion behaviour of thermally sprayed alumina-titania composite coatings on aluminium alloys
Author: H. MINDIVAN
Abstract: In this study, Al2O3 - 13TiO2 + 10 % polytetrafluoroethylene (PTFE) powders were sprayed using both flame and plasma spray processes after a NiAl bond layer was deposited on 2024-T6 aluminium alloy substrate. The characterization of the coatings was made by microscopic examinations, thickness, surface roughness, porosity and hardness measurements and X-ray diffraction (XRD) analysis. Corrosion and wear performances of the samples were analysed by using a potentiodynamic polarization scanning (PDS) technique and a reciprocating wear tester, respectively. It was found that the flame and plasma sprayed Al2O3 - 13TiO2 + 10 % PTFE coatings possessed about two and four times higher wear resistance than AA2024-T6 substrate, respectively. When compared to the flame sprayed Al2O3 - 13TiO2 + 10 % PTFE coating, the plasma sprayed Al2O3 - 13TiO2 + 10 % PTFE coating with a lower porosity showed higher hardness and better wear and corrosion resistance.
Keywords: aluminium, coating, corrosion, thermal spray, wear
Year: 2010, Volume: 48, Issue: 3 Page From: 203, Page To: 210
doi:10.4149/km_2010_3_203
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