Journal
SURFACE & COATINGS TECHNOLOGY
Volume 205, Issue 19, Pages 4500-4506Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2011.03.065
Keywords
Duplex PEO/MoC coating; Mg-U alloy; Plasma electrolytic oxidation
Funding
- National 863 Project [2006AA03Z510]
- Harbin Engineering University Basic Research Foundation [HEUFT 07055]
- Foundation for Youth Science and Technology innovation Talents of Harbin of China [2008RFQXG036]
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A combined PEO and chemical conversion process was employed to fabricate duplex plasma electrolytic oxidation/molybdate conversion (PEO/MoC) coating on the surface of Mg-Li alloy. The microstructure and composition of the composite coatings were investigated by SEM, EDX, XRD and XPS. The anti-corrosion properties of duplex PEO/MoC coatings were evaluated by potentiodynamic polarization and EIS. The duplex PEO/MoC coating was composed of crystalline NaMgF3, Mg2SiO4, MoO3 and MgO. Spherical-like microparticles accumulated and dispersed uniformly on the surface of the PEO coating. The corrosion resistance for Mg-Li alloy was improved by using a combination of plasma electrolytic oxidation and chemical conversion. (C) 2011 Elsevier B.V. All rights reserved.
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