[en] The interactions between the chemical groups of polymers and metallic substrates play a crucial role in corrosion protection, particularly for magnesium (Mg) alloys, which have been less studied in this context. To address this, benzoxazine resins with varying chemical structures were synthesized, and the impact of each structure on the corrosion protection of the resulting coatings was evaluated using electrochemical impedance spectroscopy (EIS). Four types of coatings exhibiting different levels of flexibility and hydrophobicity were synthesized and applied on Mg alloys via drop casting. The protective effects of these coatings were examined in both saline and acidic environments. Our results demonstrated that the length of the alkyl chains and the presence of additional aromatic groups within the benzoxazine resin backbone significantly influence the corrosion resistance of the resulting coatings. Adhesion of the coatings to the substrates was assessed before and after 35 days of immersion in 0.1 M NaCl solution. Coatings derived from monomers with longer alkyl chains exhibited superior corrosion protection in saline solutions. Water contact angle measurements were conducted to evaluate the hydrophobicity of the coatings, revealing that the most hydrophobic sample, with a contact angle of 105°, featured both a longer alkyl chain and additional aromatic rings. Furthermore, the presence of these aromatic groups directly attached to a tertiary amine was also found to enhance the coatings' resistance to 0.1 M H2SO4 solution.
Disciplines :
Materials science & engineering
Author, co-author :
Malekkhouyan, Roya ; Université de Mons - UMONS > Faculté Polytechnique > Service de Science des Matériaux
Van Renterghem, Louis ; Université de Mons - UMONS > Unités externes > Materia Nova ASBL
Bonnaud, Leila ; Université de Mons - UMONS > Unités externes > Materia Nova ASBL
Raquez, Jean-Marie ; Université de Mons - UMONS > Faculté des Sciences > Service des Matériaux Polymères et Composites
Olivier, Marjorie ; Université de Mons - UMONS > Faculté Polytechnique > Service de Science des Matériaux
Language :
English
Title :
Effect of benzoxazine chemical structure on the corrosion protection of AZ31 Mg alloy in saline and acidic solutions
F502 - Science des Matériaux S816 - Matériaux Polymères et Composites
Research institute :
R400 - Institut de Recherche en Science et Ingénierie des Matériaux
Name of the research project :
5191 - ARC2020 Raquez - PROCOMAG - DEVELOPEMENT OF NEW DOPED RESINS FOR THE CORROSION PROTECTION OF MAGNESIUM ALLOYS - Fédération Wallonie Bruxelles
Funders :
FWB - Fédération Wallonie-Bruxelles
Funding number :
5191
Funding text :
The authors wish to thank the Wallonia-Brussels Federation, Wallonia, and the European Community for general support in the frame of the Concerted Research Action program (ARC 2020 - PROCOMAG project). L.B. also want to thank HORIZON-JU-CBE-2023-R-04 for Project 101157517 \u2014 SSUCHY-Next. JMR is FRS-FNRS senior research associate.
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