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

Detalhes bibliográficos
Autor(a) principal: dos Santos, Fábio Cesar [UNESP]
Data de Publicação: 2021
Outros Autores: Pulcinelli, Sandra Helena [UNESP], Santilli, Celso Valentim [UNESP], Hammer, Peter [UNESP]
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1016/j.porgcoat.2020.106129
http://hdl.handle.net/11449/208311
Resumo: Organic-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.
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spelling Protective PMMA-silica coatings for aluminum alloys: Nanostructural control of elevated thermal stability and anticorrosive performanceCorrosion resistanceNanostructured hybrid coatingsOrganic-inorganic nanocompositePMMA-silicaPoly(methyl methacrylate)Thermal stabilityOrganic-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.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)São Paulo State University (UNESP) Institute of ChemistrySão Paulo State University (UNESP) Institute of ChemistryCNPq: 307905/2018-7CNPq: 424133/2016-4Universidade Estadual Paulista (Unesp)dos Santos, Fábio Cesar [UNESP]Pulcinelli, Sandra Helena [UNESP]Santilli, Celso Valentim [UNESP]Hammer, Peter [UNESP]2021-06-25T11:10:06Z2021-06-25T11:10:06Z2021-03-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1016/j.porgcoat.2020.106129Progress in Organic Coatings, v. 152.0300-9440http://hdl.handle.net/11449/20831110.1016/j.porgcoat.2020.1061292-s2.0-85099193559Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengProgress in Organic Coatingsinfo:eu-repo/semantics/openAccess2021-10-23T19:01:58Zoai:repositorio.unesp.br:11449/208311Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-23T19:01:58Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Protective PMMA-silica coatings for aluminum alloys: Nanostructural control of elevated thermal stability and anticorrosive performance
title Protective PMMA-silica coatings for aluminum alloys: Nanostructural control of elevated thermal stability and anticorrosive performance
spellingShingle Protective PMMA-silica coatings for aluminum alloys: Nanostructural control of elevated thermal stability and anticorrosive performance
dos Santos, Fábio Cesar [UNESP]
Corrosion resistance
Nanostructured hybrid coatings
Organic-inorganic nanocomposite
PMMA-silica
Poly(methyl methacrylate)
Thermal stability
title_short Protective PMMA-silica coatings for aluminum alloys: Nanostructural control of elevated thermal stability and anticorrosive performance
title_full Protective PMMA-silica coatings for aluminum alloys: Nanostructural control of elevated thermal stability and anticorrosive performance
title_fullStr Protective PMMA-silica coatings for aluminum alloys: Nanostructural control of elevated thermal stability and anticorrosive performance
title_full_unstemmed Protective PMMA-silica coatings for aluminum alloys: Nanostructural control of elevated thermal stability and anticorrosive performance
title_sort Protective PMMA-silica coatings for aluminum alloys: Nanostructural control of elevated thermal stability and anticorrosive performance
author dos Santos, Fábio Cesar [UNESP]
author_facet dos Santos, Fábio Cesar [UNESP]
Pulcinelli, Sandra Helena [UNESP]
Santilli, Celso Valentim [UNESP]
Hammer, Peter [UNESP]
author_role author
author2 Pulcinelli, Sandra Helena [UNESP]
Santilli, Celso Valentim [UNESP]
Hammer, Peter [UNESP]
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv dos Santos, Fábio Cesar [UNESP]
Pulcinelli, Sandra Helena [UNESP]
Santilli, Celso Valentim [UNESP]
Hammer, Peter [UNESP]
dc.subject.por.fl_str_mv Corrosion resistance
Nanostructured hybrid coatings
Organic-inorganic nanocomposite
PMMA-silica
Poly(methyl methacrylate)
Thermal stability
topic Corrosion resistance
Nanostructured hybrid coatings
Organic-inorganic nanocomposite
PMMA-silica
Poly(methyl methacrylate)
Thermal stability
description Organic-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.
publishDate 2021
dc.date.none.fl_str_mv 2021-06-25T11:10:06Z
2021-06-25T11:10:06Z
2021-03-01
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1016/j.porgcoat.2020.106129
Progress in Organic Coatings, v. 152.
0300-9440
http://hdl.handle.net/11449/208311
10.1016/j.porgcoat.2020.106129
2-s2.0-85099193559
url http://dx.doi.org/10.1016/j.porgcoat.2020.106129
http://hdl.handle.net/11449/208311
identifier_str_mv Progress in Organic Coatings, v. 152.
0300-9440
10.1016/j.porgcoat.2020.106129
2-s2.0-85099193559
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Progress in Organic Coatings
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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