Improving the Corrosion Resistance of Wrought ZM21 Magnesium Alloys by Plasma Electrolytic Oxidation and Powder Coating

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 soluti...

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Autores principales: Ballam, Lavanya Rani, Arab, Hamed, Bestetti, Massimiliano, Franz, Silvia, Masi, Giulia, Sola, Ramona, Donati, Lorenzo, Martini, Carla
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
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Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8124284/
https://www.ncbi.nlm.nih.gov/pubmed/33925662
http://dx.doi.org/10.3390/ma14092268
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author Ballam, Lavanya Rani
Arab, Hamed
Bestetti, Massimiliano
Franz, Silvia
Masi, Giulia
Sola, Ramona
Donati, Lorenzo
Martini, Carla
author_facet Ballam, Lavanya Rani
Arab, Hamed
Bestetti, Massimiliano
Franz, Silvia
Masi, Giulia
Sola, Ramona
Donati, Lorenzo
Martini, Carla
author_sort Ballam, Lavanya Rani
collection PubMed
description 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.
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spelling pubmed-81242842021-05-17 Improving the Corrosion Resistance of Wrought ZM21 Magnesium Alloys by Plasma Electrolytic Oxidation and Powder Coating Ballam, Lavanya Rani Arab, Hamed Bestetti, Massimiliano Franz, Silvia Masi, Giulia Sola, Ramona Donati, Lorenzo Martini, Carla Materials (Basel) Article 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. MDPI 2021-04-27 /pmc/articles/PMC8124284/ /pubmed/33925662 http://dx.doi.org/10.3390/ma14092268 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Ballam, Lavanya Rani
Arab, Hamed
Bestetti, Massimiliano
Franz, Silvia
Masi, Giulia
Sola, Ramona
Donati, Lorenzo
Martini, Carla
Improving the Corrosion Resistance of Wrought ZM21 Magnesium Alloys by Plasma Electrolytic Oxidation and Powder Coating
title Improving the Corrosion Resistance of Wrought ZM21 Magnesium Alloys by Plasma Electrolytic Oxidation and Powder Coating
title_full Improving the Corrosion Resistance of Wrought ZM21 Magnesium Alloys by Plasma Electrolytic Oxidation and Powder Coating
title_fullStr Improving the Corrosion Resistance of Wrought ZM21 Magnesium Alloys by Plasma Electrolytic Oxidation and Powder Coating
title_full_unstemmed Improving the Corrosion Resistance of Wrought ZM21 Magnesium Alloys by Plasma Electrolytic Oxidation and Powder Coating
title_short Improving the Corrosion Resistance of Wrought ZM21 Magnesium Alloys by Plasma Electrolytic Oxidation and Powder Coating
title_sort improving the corrosion resistance of wrought zm21 magnesium alloys by plasma electrolytic oxidation and powder coating
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8124284/
https://www.ncbi.nlm.nih.gov/pubmed/33925662
http://dx.doi.org/10.3390/ma14092268
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