Corrosion protection of hot dip galvanized steel in mortar

Detalhes bibliográficos
Autor(a) principal: Figueira, R. M.
Data de Publicação: 2013
Outros Autores: Pereira, E. V., Silva, Carlos J. R., Salta, M. M.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/1822/57136
Resumo: Corrosion of steel in concrete is one of the major causes of structure degradation, requiring expensive maintenance. The using of hot dip galvanized steel (HDGS) has been recognized as one effective measure to increase the service life of reinforced concrete structures in marine environmental. However, HDGS corrodes in contact with high alkaline environment of fresh concrete. Although this initial corrosion process allows the formation of a protecting layer barrier, the corrosion that occurs initially is harmful and chromate conversion layers are usually used to prevent it. Due to toxicity of Cr(VI), these kinds of pre-treatments have been forbidden and hybrid coatings have been proposed as alternatives [1-3]. To evaluate the performance of these coatings, beyond the laboratory characterization, in situ tests in real conditions should be performed. An electrochemical system to measure the macrocell current density (igal) was designed to evaluate the degradation of HDGS coated samples with different organic-inorganic hybrid films, embedded in mortar during 70 days, using an automatic data acquisition system. This system revealed to be feasible and highly sensitive to coatings degradation. Also, allow distinguishing different hybrid coatings with different thicknesses.
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spelling Corrosion protection of hot dip galvanized steel in mortarCorrosionGalvanized steelProtectionGel coatingSol-gelCiências Naturais::Ciências QuímicasScience & TechnologyCorrosion of steel in concrete is one of the major causes of structure degradation, requiring expensive maintenance. The using of hot dip galvanized steel (HDGS) has been recognized as one effective measure to increase the service life of reinforced concrete structures in marine environmental. However, HDGS corrodes in contact with high alkaline environment of fresh concrete. Although this initial corrosion process allows the formation of a protecting layer barrier, the corrosion that occurs initially is harmful and chromate conversion layers are usually used to prevent it. Due to toxicity of Cr(VI), these kinds of pre-treatments have been forbidden and hybrid coatings have been proposed as alternatives [1-3]. To evaluate the performance of these coatings, beyond the laboratory characterization, in situ tests in real conditions should be performed. An electrochemical system to measure the macrocell current density (igal) was designed to evaluate the degradation of HDGS coated samples with different organic-inorganic hybrid films, embedded in mortar during 70 days, using an automatic data acquisition system. This system revealed to be feasible and highly sensitive to coatings degradation. Also, allow distinguishing different hybrid coatings with different thicknesses.The authors would like to gratefully acknowledge the financial support from Fundação para a Ciência e Tecnologia (FCT) for the PhD grant SFRH/BD/62601/2009 and the financial support by Centro de Química [project F-COMP-01-0124-FEDER-022716 (ref. FCT Pest-C/Qui/UI0686/2011)-FEDER-COMPETE]. The authors would also like to thank Hugo Marques Gomes for assisting in the schematic representations.info:eu-repo/semantics/publishedVersionSociedade Portuguesa de ElectroquímicaUniversidade do MinhoFigueira, R. M.Pereira, E. V.Silva, Carlos J. R.Salta, M. M.20132013-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/57136engFIGUEIRA, Rita M.; PEREIRA, Elsa V.; SILVA, Carlos J.R. e SALTA, Maria M.. Corrosion Protection of Hot Dip Galvanized Steel in Mortar. Port. Electrochim. Acta [online]. 2013, vol.31, n.5, pp.277-287. ISSN 0872-1904. http://dx.doi.org/10.4152/pea.201305277.1647-157110.4152/pea.201305277info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-21T11:53:58Zoai:repositorium.sdum.uminho.pt:1822/57136Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T18:43:25.545728Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Corrosion protection of hot dip galvanized steel in mortar
title Corrosion protection of hot dip galvanized steel in mortar
spellingShingle Corrosion protection of hot dip galvanized steel in mortar
Figueira, R. M.
Corrosion
Galvanized steel
Protection
Gel coating
Sol-gel
Ciências Naturais::Ciências Químicas
Science & Technology
title_short Corrosion protection of hot dip galvanized steel in mortar
title_full Corrosion protection of hot dip galvanized steel in mortar
title_fullStr Corrosion protection of hot dip galvanized steel in mortar
title_full_unstemmed Corrosion protection of hot dip galvanized steel in mortar
title_sort Corrosion protection of hot dip galvanized steel in mortar
author Figueira, R. M.
author_facet Figueira, R. M.
Pereira, E. V.
Silva, Carlos J. R.
Salta, M. M.
author_role author
author2 Pereira, E. V.
Silva, Carlos J. R.
Salta, M. M.
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidade do Minho
dc.contributor.author.fl_str_mv Figueira, R. M.
Pereira, E. V.
Silva, Carlos J. R.
Salta, M. M.
dc.subject.por.fl_str_mv Corrosion
Galvanized steel
Protection
Gel coating
Sol-gel
Ciências Naturais::Ciências Químicas
Science & Technology
topic Corrosion
Galvanized steel
Protection
Gel coating
Sol-gel
Ciências Naturais::Ciências Químicas
Science & Technology
description Corrosion of steel in concrete is one of the major causes of structure degradation, requiring expensive maintenance. The using of hot dip galvanized steel (HDGS) has been recognized as one effective measure to increase the service life of reinforced concrete structures in marine environmental. However, HDGS corrodes in contact with high alkaline environment of fresh concrete. Although this initial corrosion process allows the formation of a protecting layer barrier, the corrosion that occurs initially is harmful and chromate conversion layers are usually used to prevent it. Due to toxicity of Cr(VI), these kinds of pre-treatments have been forbidden and hybrid coatings have been proposed as alternatives [1-3]. To evaluate the performance of these coatings, beyond the laboratory characterization, in situ tests in real conditions should be performed. An electrochemical system to measure the macrocell current density (igal) was designed to evaluate the degradation of HDGS coated samples with different organic-inorganic hybrid films, embedded in mortar during 70 days, using an automatic data acquisition system. This system revealed to be feasible and highly sensitive to coatings degradation. Also, allow distinguishing different hybrid coatings with different thicknesses.
publishDate 2013
dc.date.none.fl_str_mv 2013
2013-01-01T00:00:00Z
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://hdl.handle.net/1822/57136
url http://hdl.handle.net/1822/57136
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv FIGUEIRA, Rita M.; PEREIRA, Elsa V.; SILVA, Carlos J.R. e SALTA, Maria M.. Corrosion Protection of Hot Dip Galvanized Steel in Mortar. Port. Electrochim. Acta [online]. 2013, vol.31, n.5, pp.277-287. ISSN 0872-1904. http://dx.doi.org/10.4152/pea.201305277.
1647-1571
10.4152/pea.201305277
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Sociedade Portuguesa de Electroquímica
publisher.none.fl_str_mv Sociedade Portuguesa de Electroquímica
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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