Article (Scientific journals)
Functionalization of Plasma Electrolytic Oxidation/Sol–Gel Coatings on AZ31 with Organic Corrosion Inhibitors
Pillado, Borja; Matykina, Endzhe; Olivier, Marie-Georges et al.
2024In Coatings, 14 (1), p. 84
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Keywords :
corrosion; inhibitor; magnesium; plasma electrolytic oxidation; sol–gel; Surfaces and Interfaces; Surfaces, Coatings and Films; Materials Chemistry
Abstract :
[en] In this investigation, the sol–gel method is employed along with a corrosion inhibitor to seal a plasma electrolytic oxidation (PEO) coating, aiming to improve the long-term corrosion resistance of the AZ31 Mg alloy. Following an initial screening of corrosion inhibitors, 8-hydroxyquinoline (8HQ) is incorporated into the hybrid PEO/sol–gel system using two methods: (i) post-treatment of the PEO layer through immersion in an inhibitor-containing solution; (ii) loading the inhibitor into the sol–gel precursor. The characterization includes scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible spectroscopy (UV-vis), and water drop contact angle measurements. The rheological properties of the inhibitor-loaded sol–gel precursors are assessed by measuring flow curves. The corrosion processes are evaluated in a saline solution through electrochemical impedance spectroscopy (EIS) and immersion tests with unscratched and scratched specimens, respectively. The results demonstrate the successful incorporation of the inhibitor for both loading strategies. Regardless of the loading approach, systems containing 8HQ exhibit the most favourable long-term corrosion resistance.
Research center :
CRIM - Ingénierie des matériaux
Disciplines :
Materials science & engineering
Author, co-author :
Pillado, Borja;  Departamento de Ingeniería Química y de Materiales, Facultad de Ciencias Químicas, Universidad Complutense, Madrid, Spain ; Institut Laue-Langevin, Grenoble, France
Matykina, Endzhe ;  Departamento de Ingeniería Química y de Materiales, Facultad de Ciencias Químicas, Universidad Complutense, Madrid, Spain
Olivier, Marie-Georges  ;  Université de Mons - UMONS > Faculté Polytechnique > Service de Science des Matériaux
Mohedano, Marta ;  Departamento de Ingeniería Química y de Materiales, Facultad de Ciencias Químicas, Universidad Complutense, Madrid, Spain
Arrabal, Raúl ;  Departamento de Ingeniería Química y de Materiales, Facultad de Ciencias Químicas, Universidad Complutense, Madrid, Spain
Language :
English
Title :
Functionalization of Plasma Electrolytic Oxidation/Sol–Gel Coatings on AZ31 with Organic Corrosion Inhibitors
Publication date :
2024
Journal title :
Coatings
eISSN :
2079-6412
Publisher :
Multidisciplinary Digital Publishing Institute (MDPI)
Volume :
14
Issue :
1
Pages :
84
Peer reviewed :
Peer Reviewed verified by ORBi
Research unit :
F502 - Science des Matériaux
Research institute :
R400 - Institut de Recherche en Science et Ingénierie des Matériaux
Funders :
MCIN/AEI/FEDER, EU
Materials Institute of UMONS
Funding number :
PID2021-124341OB-C22
Funding text :
The authors gratefully acknowledge the support of PID2021-124341OB-C22 project (MCIN/AEI/FEDER, EU) and the Materials Institute of UMONS. M. Mohedano is grateful for the support of RYC-2017 21843.
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since 27 February 2024

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