Characterization of ceramic coatings on 6061 Al alloy produced by plasma electrolytic oxidation

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ConferenceSurface Canada 2013, May 8-11, 2013, London ON, Canada
AbstractPlasma electrolytic oxidation (PEO) is a relatively novel surface finishing technique that converts the surface of light metals and alloys into a ceramic layer. It allows the production of relatively thick oxide layers on the surface of valve metals (Mg, Al, Ti, etc.) and their alloys. For Al alloys, the coatings produced by PEO mainly consist of oxides with high hardness and there are more suitible for tribological applications than the substrate material. The PEO coatings can also effectively protect the base metal against corrosion. PEO may be viewed as a technology which is intermediate between conventional low voltage anodising in aqueous solutions and high energy plasma coating under dry conditions. The PEO process operates at potentials greater than typical breakdown voltages of the original oxide films (typically 400-700 V). Breakdown of the film is accompanied by multiple sparking on treated surfaces. The properties of the coatings produced by PEO can be controlled and altered by changing process parameters. In this study, ceramic coatings were deposited on the 6061 alloy and the effect of the electrical parameters studied. The morphology, microstructure and compositions of the coatings were analyzed using SEM, energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction. The results suggest that the coating morphology, growth rate and phase composition are affected by varying electrical parameters. This information can be used to understand the PEO coating growth behaviour better and improve the quality of the coatings for required applications.
AffiliationAutomotive and Surface Transportation; National Research Council Canada
Peer reviewedYes
NPARC number21273921
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Record identifierba16ecb5-af8b-423c-b40b-20c9f24c8c18
Record created2015-02-03
Record modified2016-05-09
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