Corrosion and wear properties of PEO coatings formed on AM60B alloy in NaAlO2 electrolytes

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DOIResolve DOI: http://doi.org/10.1016/j.apsusc.2011.05.115
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TypeArticle
Journal titleApplied Surface Science
ISSN0169-4332
Volume257
Issue21
Pages91359141; # of pages: 7
SubjectCoated sample; Low porosity; Pin-on-disk wear test; Plasma electrolytic oxidation; Potentiodynamic polarization tests; SEM analysis; Thick coatings; Wear properties; Wear volume loss; Alloys; Corrosion; Electrolysis; Electrolytes; Magnesium; Magnesium alloys; Oxidation; Wear resistance; X ray diffraction; Protective coatings
AbstractCoatings with a thickness of 22-32 μm were formed on an AM60B magnesium alloy by plasma electrolytic oxidation (PEO) in electrolytes containing 12.0-24.0 g/l NaAlO2 and other additives. SEM analyses of the coated samples showed that the coatings were compact with relatively low porosity. X-ray diffraction revealed that the coatings consisted of mainly MgAl 2O4 and MgO phases. The relative amount of MgAl 2O4 in the coating increased with increasing NaAlO 2 concentration. The relatively compact and thick coatings provide good corrosion protection for magnesium, as indicated by the results of potentiodynamic polarization tests. In addition, the PEO treatment also significantly improved the wear resistance of the alloy. Pin-on-disk wear tests showed that the PEO treatment reduced the wear volume loss by a factor of 10. © 2011 Elsevier B.V. All rights reserved.
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LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute (IMI-IMI)
Peer reviewedYes
NPARC number21271475
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Record identifier1cd1eae6-ab1e-417e-a803-ca97a9988771
Record created2014-03-24
Record modified2016-05-09
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