Protective PMMA-silica coatings for aluminum alloys: Nanostructural control of elevated thermal stability and anticorrosive performance
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , |
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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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:29462024-08-05T23:46:32.573295Repositório 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 |
|
_version_ |
1808129550718074880 |