High anti-corrosion barrier of poly (methyl methacrylate)-silica coatings explained: A thousand-days study

Registro completo de metadados
MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorUvida, Mayara Carla-
Autor(es): dc.creatorTrentin, Andressa-
Autor(es): dc.creatorPulcinelli, Sandra Helena-
Autor(es): dc.creatorSantilli, Celso Valentim-
Autor(es): dc.creatorHammer, Peter-
Data de aceite: dc.date.accessioned2025-08-21T21:35:57Z-
Data de disponibilização: dc.date.available2025-08-21T21:35:57Z-
Data de envio: dc.date.issued2025-04-29-
Data de envio: dc.date.issued2024-07-30-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.apsusc.2024.160100-
Fonte completa do material: dc.identifierhttps://hdl.handle.net/11449/303891-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/303891-
Descrição: dc.descriptionPoly (methyl methacrylate) (PMMA)-silica coatings form a few micrometers thick anti-corrosive barrier that blocks corrosive species when exposed to harsh environments. Their excellent anti-corrosive performance stands out for protecting metal alloys immersed in seawater for long periods (>2 years), making them compliant for applications in the marine, aeronautical, and automotive industries. A key approach to understanding the degradation of high-performance coatings over time consists of analyzing their water uptake-induced structural changes. This work examines in detail the uptake and structural modification of PMMA-silica coatings on Al alloys immersed for more than 1000 days in 3.5 wt% NaCl solution. Gravimetry, thermal analysis, infrared spectroscopy and electrochemical impedance spectroscopy (EIS) were employed to monitor the evolution of coated samples. Nuclear magnetic resonance, X-ray photoelectron spectroscopy, electron and atomic force microscopies before and after immersion indicate a slight leaching-induced surface roughening due to silica hydrolysis. These findings comply with the low uptake values (∼0.6 vol%) and a less-Fickian diffusion coefficient obtained from modelling of the EIS data. The high impedance modulus (>GΩ) is related to the highly cross-linked structure, resulting in a very low permeation rate of the electrolyte. The applied methodology is of crucial importance for establishing a standardized analysis for high-performance protective coatings.-
Descrição: dc.descriptionSão Paulo State University Institute of Chemistry, SP-
Descrição: dc.descriptionSão Paulo State University Institute of Chemistry, SP-
Idioma: dc.languageen-
Relação: dc.relationApplied Surface Science-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectAluminum alloy-
Palavras-chave: dc.subjectEIS-
Palavras-chave: dc.subjectHigh-performance coatings-
Palavras-chave: dc.subjectPMMA-silica-
Palavras-chave: dc.subjectWater uptake-
Título: dc.titleHigh anti-corrosion barrier of poly (methyl methacrylate)-silica coatings explained: A thousand-days study-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

Não existem arquivos associados a este item.