Protective PMMA-silica coatings for aluminum alloys: Nanostructural control of elevated thermal stability and anticorrosive performance

Registro completo de metadados
MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (Unesp)-
Autor(es): dc.creatordos Santos, Fábio Cesar [UNESP]-
Autor(es): dc.creatorPulcinelli, Sandra Helena [UNESP]-
Autor(es): dc.creatorSantilli, Celso Valentim [UNESP]-
Autor(es): dc.creatorHammer, Peter [UNESP]-
Data de aceite: dc.date.accessioned2022-02-22T00:53:04Z-
Data de disponibilização: dc.date.available2022-02-22T00:53:04Z-
Data de envio: dc.date.issued2021-06-25-
Data de envio: dc.date.issued2021-06-25-
Data de envio: dc.date.issued2021-03-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.porgcoat.2020.106129-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/208311-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/208311-
Descrição: dc.descriptionOrganic-inorganic hybrid coatings for corrosion protection of aluminum alloys are promising alternatives to the current methods based on chromate passivation. This study examined the role of the polymer/silica ratio in terms of the hybrid nanostructure formed and its effect on the thermal stability and anticorrosive performance of the polymethyl methacrylate (PMMA)-siloxane-silica hybrid coatings. The chemical and nanostructural properties of the hybrid coatings assessed using Fourier transform infrared (FTIR) and small angle X-ray scattering (SAXS) were correlated with the thermal stability evaluated by thermogravimetry (TGA) and corrosion protection evaluated by electrochemical impedance spectroscopy (EIS) in saline/acid solution (NaCl 3.5 % + HCl pH 3). TGA showed that the high thermal stability (up to 287 °C) of the hybrid formulations with lower silica fractions is related to the adequate size and spacing of the siloxane nodes in the embedding polymer matrix. Correlation of SAXS and EIS measurements allowed to identify the specific molar ratios and nanostructural configuration in which the polymer and siloxane-silica nodes ideally combine forming thin PMMA-silica coatings (2−5 μm) that present long-term stability (> 6 months) with a corrosion resistance of up to 25 GΩ cm2, being approximately 7 orders of magnitude higher than that of the uncoated Al2024-T3 substrate.-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionSão Paulo State University (UNESP) Institute of Chemistry-
Descrição: dc.descriptionSão Paulo State University (UNESP) Institute of Chemistry-
Descrição: dc.descriptionCNPq: 307905/2018-7-
Descrição: dc.descriptionCNPq: 424133/2016-4-
Idioma: dc.languageen-
Relação: dc.relationProgress in Organic Coatings-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectCorrosion resistance-
Palavras-chave: dc.subjectNanostructured hybrid coatings-
Palavras-chave: dc.subjectOrganic-inorganic nanocomposite-
Palavras-chave: dc.subjectPMMA-silica-
Palavras-chave: dc.subjectPoly(methyl methacrylate)-
Palavras-chave: dc.subjectThermal stability-
Título: dc.titleProtective PMMA-silica coatings for aluminum alloys: Nanostructural control of elevated thermal stability and anticorrosive performance-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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