Comparison of the protective efficiency of polymethacrylates with different side chain length for AA2024 alloy
Author
dc.contributor.author
Muñoz, Lisa
Author
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Sancy, Mamié
Author
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Guerra, Carolina
Author
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Flores Carrasco, Marcos Iván
Author
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Molina, Paulo
Author
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Muñoz, Hugo
Author
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Bruna, Tamara
Author
dc.contributor.author
Arcos, Camila
Author
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Urzúa Acevedo, Marcela del Pilar
Author
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Encinas, María V.
Author
dc.contributor.author
Páez, Maritza A.
Admission date
dc.date.accessioned
2022-05-03T16:34:49Z
Available date
dc.date.available
2022-05-03T16:34:49Z
Publication date
dc.date.issued
2021
Cita de ítem
dc.identifier.citation
Journal of materials research and technology 2021; 15:7125 - 7135
es_ES
Identifier
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10.1016/j.jmrt.2021.11.067
Identifier
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https://repositorio.uchile.cl/handle/2250/185226
Abstract
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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.
es_ES
Patrocinador
dc.description.sponsorship
POSTDOC Dicyt 029142 PC_POSTDOC
Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)
CONICYT FONDECYT 1180843
1160604
CONICYT-Fondequip EQM 160091
EQM 15010
es_ES
Lenguage
dc.language.iso
en
es_ES
Publisher
dc.publisher
Elsevier
es_ES
Type of license
dc.rights
Attribution-NonCommercial-NoDerivs 3.0 United States