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- Title
Improving the Corrosion Resistance of Wrought ZM21 Magnesium Alloys by Plasma Electrolytic Oxidation and Powder Coating.
- Authors
Ballam, Lavanya Rani; Arab, Hamed; Bestetti, Massimiliano; Franz, Silvia; Masi, Giulia; Sola, Ramona; Donati, Lorenzo; Martini, Carla; Kulinich, Sergei
- Abstract
Plasma Electrolytic Oxidation (PEO) was applied to extruded ZM21 Mg alloys to improve their corrosion resistance in a chloride-containing environment. PEO was carried out in DC mode and voltage control in a fluoride-free electrolyte. Potentiodynamic polarization tests in 3.5 wt.% NaCl aqueous solution and neutral salt spray (NSS) tests were carried out. Microstructural and profilometric characterization, as well as NSS tests were performed in different conditions: (i) bare ZM21, (ii) PEO-treated ZM21, (iii) powder-coated ZM21 (without PEO interlayer), and (iv) PEO-treated ZM21 with powder coating top layer (carboxyl-functionalized polyester resin). The PEO + powder coating double layer was identified as the best-performing corrosion protection.
- Subjects
ELECTROLYTIC oxidation; CORROSION resistance; POWDER coating; MAGNESIUM alloys; SALTWATER solutions
- Publication
Materials (1996-1944), 2021, Vol 14, Issue 9, p2268
- ISSN
1996-1944
- Publication type
Article
- DOI
10.3390/ma14092268