Comparison of the protective efficiency of polymethacrylates with different side chain length for AA2024 alloy
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Muñoz, Lisa
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Comparison of the protective efficiency of polymethacrylates with different side chain length for AA2024 alloy
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Abstract
The protective properties of polymethacrylate coatings with different side chain lengths
for 2024 aluminum alloys were studied, focusing on the chain length increase but also on
the Ar-plasma pretreatment applied to the metal surface. The coatings were obtained by
photopolymerization, obtaining reproducible molecular weight polymers during each
process that were determined by high-performance liquid chromatography. AA2024 alloy
were immersed into the polymethacrylate solution using methyl, butyl, and hexyl as
monomers. Their roughness was then evaluated using atomic force microscopy. Surface
hydrophobicity and contact angle hysteresis were analyzed in water and diiodomethane.
Protective properties were evaluated by electrochemical impedance spectroscopy after 56
days of immersion in a 0.1 M Na2SO4. The alloy cross-sections were examined by field
emission scanning electron microscopy and glow discharge optical emission spectroscopy,
allowing the estimation of film thickness. Surface analysis revealed that the defect population
densities in the coatings increased the monomer alkyl chain length. The immersion thickness increase was consistent with contact angle measurements taken over time, and
independent from the chain length. Contradicting expectations, the results showed the
protective efficacy was not related to the chain length, since after exposure, the PBMA film
revealed the best anti-corrosive coating performance on the AA2024. This was possibly
influenced by its polymeric film conformation, hydrophilicity, ordering and lower density
of defects on the metal surface.
Patrocinador
POSTDOC Dicyt 029142 PC_POSTDOC
Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)
CONICYT FONDECYT 1180843
1160604
CONICYT-Fondequip EQM 160091
EQM 15010
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Artículo de publícación WoS Artículo de publicación SCOPUS
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Journal of materials research and technology 2021; 15:7125 - 7135
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