[en] The sol-gel sealing method is widely recognized as a simple and effective technique for enhancing the protective performance of plasma electrolytic oxidation (PEO) coatings. While sol-gel coatings are already known for their reliability and corrosion resistance, incorporating nanoparticles has been shown to further improve their barrier properties. Our objective was to validate the positive impact of incorporating nanosheets and assess the influence of h-BN functionalization in the sol-gel/PEO coating system on AA2024. Specifically, as-received, oxidized, and functionalized nanopowders at two concentrations were added to the sol-gel solution. (3-Aminopropyl)triethoxysilane (APTES) was selected as the suitable candidate for h-BN functionalization, given that the sol-gel sealing comprises a combination of (3-glycidyloxypropyl)trimethoxysilane (GPTMS) and tetraethoxysilane (TEOS). Consequently, higher compatibility between the nanopowders and the sol-gel matrix was achieved, thereby improving the barrier properties. Various chemical techniques, such as zeta potential (ZP) measurement and Fourier Transform Infrared Spectroscopy (FTIR), were employed to confirm the successful oxidation and functionalization processes. Rheology evaluation further affirmed the influence of h-BN functionalization on its compactness and the viscosity of the network. The trace of nanosheets within the sol-gel coating on top of the PEO layer was visualized using Field Emission Scanning Electron Microscopy (FE-SEM). Finally, Electrochemical Impedance Spectroscopy (EIS) analysis reported that the modified sol-gel coating with functionalized h-BN exhibited the greatest corrosion resistance after exposure to 0.1 M NaCl electrolyte for 14 days.
Disciplines :
Materials science & engineering
Author, co-author :
Akbarzadeh, Sajjad ; Université de Mons - UMONS > Faculté Polytechnique > Service de Science des Matériaux
Batjargal, Zorigtbaatar; Materials Science Department, Faculty of Engineering, University of Mons, Mons, Belgium
Ölmez, Vedi; Belgian Ceramic Research Centre (BCRC), Mons, Belgium
Olivier, Marjorie ; Université de Mons - UMONS > Faculté Polytechnique > Service de Science des Matériaux
Language :
English
Title :
Modified sol-gel layer incorporating hexagonal boron nitride (h-BN) nanosheets for improved corrosion resistance in plasma electrolytic oxidation coatings on AA2024
R400 - Institut de Recherche en Science et Ingénierie des Matériaux
Name of the research project :
4573 - SEALCERA - Corrosion and tribocorrosion performance of sealed ceramic coatings obtained by plasma electrolytic oxidation - Fédération Wallonie Bruxelles
Funders :
FWB - Fédération Wallonie-Bruxelles
Funding text :
The authors are thankful to the University of Mons for its financial
support as part of the ARC (Actions de Recherche Concertées) SEALCERA project funded by the Fédération Wallonie-Bruxelles and the Materials Institute of UMONS.
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