Corrosion properties of plasma electrolytic oxidation coatings on an aluminium alloy - The effect of the PEO process stage

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DOIResolve DOI: http://doi.org/10.1016/j.matchemphys.2015.04.058
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TypeArticle
Journal titleMaterials Chemistry and Physics
ISSN0254-0584
Volume161
Article number18097
Pages4958; # of pages: 10
SubjectAlloys; Aluminum; Aluminum alloys; Coatings; Corrosion; Electrochemical corrosion; Electrochemical impedance spectroscopy; Electrolysis; Electron microscopy; Microstructure; Oxidation; Plasma deposition; Protective coatings; Scanning electron microscopy; Thickness measurement; Ceramics; Corrosion performance; Corrosion property; Impedance properties; Linear polarization resistance; Plasma electrolytic oxidation; Plasma electrolytic oxidation coatings; Processing parameters; Aluminum corrosion
AbstractPlasma electrolytic oxidation (PEO) coatings were grown on an aluminium alloy substrate using different processing parameters which enabled samples to be coated to different stages of the PEO process. Electrochemical impedance spectroscopy (EIS) and linear polarization resistance (LPR) techniques were employed to investigate the impedance properties of the resulting oxide coatings which will determine the corrosion performance of the coated alloy. Scanning electron microscopy was used to relate the morphology of the coatings with their corrosion performance. A direct relationship was found between the stage of the PEO process, which affects the microstructure of the coatings, and the corrosion performance. Coating thickness and phase composition did not have any measurable influence on coating corrosion performance. To some degree corrosion performance could be tailored by the processing parameters.
Publication date
PublisherElsevier
LanguageEnglish
AffiliationNational Research Council Canada; Automotive and Surface Transportation
Peer reviewedYes
NPARC number21275813
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Record identifier3bdee267-9593-413d-b780-c009ae91d036
Record created2015-07-14
Record modified2016-05-09
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