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

Coatings with a thickness of 22-32 mu m were formed on an AM60B magnesium alloy by plasma electrolytic oxidation (PEO) in electrolytes containing 12.0-24.0g/l NaAlO2 and other additives. SEM analyses of the coated samples showed that the coatings were compact with relatively low porosity. X-ray diff...

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Bibliographic Details
Published in:Applied surface science 2011-08, Vol.257 (21), p.9135-9141
Main Authors: Li, Xijin, Liu, XingYang, Luan, Ben Li
Format: Article
Language:English
Subjects:
Coatings
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Diffraction
Electrolytes
Exact sciences and technology
Magnesium
Magnesium base alloys
Physics
Protective coatings
Wear
Wear resistance
Wear tests
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Summary:Coatings with a thickness of 22-32 mu m were formed on an AM60B magnesium alloy by plasma electrolytic oxidation (PEO) in electrolytes containing 12.0-24.0g/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 MgAl2O4 and MgO phases. The relative amount of MgAl2O4 in the coating increased with increasing NaAlO2 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.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2011.05.115