Analysis of Electrochemical Porosity of Phosphatized Coatings on Galvanized Steel Substrate

Detalhes bibliográficos
Autor(a) principal: Ponte,Haroldo de Araújo
Data de Publicação: 2002
Outros Autores: Maul,Alexandre Michel, Alvarenga,Evandro de Azevedo
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Materials research (São Carlos. Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392002000400008
Resumo: This work refers to the application of a Voltammetric Anodic Dissolution (VAD) Technique in the analysis of coating discontinuities, focusing on pores and cracks that exposed the substrate. An evaluation was made of the influence of several parameters, such as the concentration of the passivation solution and sweep rate (SR), on the substrate passivation process and on the porosity indexes of tricationic phosphate coatings of Fe/Zn/Mn. The phosphatization process used was a commercial tricationic Fe/Zn/Mn phosphate bath applied on a galvanized steel (GS) substrate. Once the best experimental conditions for the use of the VAD technique had been defined, the grain size and layer weight were related to porosity indexes. The porosity was found to show a tendency to decrease with increasing grain size. The VAD technique consists of the anodic polarization of the substrate/coating system and measurement of the charge density involved in the substrate passivation process. A quantitative porosity index was obtained by comparing the passivation charge density of the substrate without coating (standard passivation charge density) and the passivation charge of the coated substrate.
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spelling Analysis of Electrochemical Porosity of Phosphatized Coatings on Galvanized Steel Substrateporositycoating discontinuitiesphosphatevoltammetric anodic dissolutionThis work refers to the application of a Voltammetric Anodic Dissolution (VAD) Technique in the analysis of coating discontinuities, focusing on pores and cracks that exposed the substrate. An evaluation was made of the influence of several parameters, such as the concentration of the passivation solution and sweep rate (SR), on the substrate passivation process and on the porosity indexes of tricationic phosphate coatings of Fe/Zn/Mn. The phosphatization process used was a commercial tricationic Fe/Zn/Mn phosphate bath applied on a galvanized steel (GS) substrate. Once the best experimental conditions for the use of the VAD technique had been defined, the grain size and layer weight were related to porosity indexes. The porosity was found to show a tendency to decrease with increasing grain size. The VAD technique consists of the anodic polarization of the substrate/coating system and measurement of the charge density involved in the substrate passivation process. A quantitative porosity index was obtained by comparing the passivation charge density of the substrate without coating (standard passivation charge density) and the passivation charge of the coated substrate.ABM, ABC, ABPol2002-10-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392002000400008Materials Research v.5 n.4 2002reponame:Materials research (São Carlos. Online)instname:Universidade Federal de São Carlos (UFSCAR)instacron:ABM ABC ABPOL10.1590/S1516-14392002000400008info:eu-repo/semantics/openAccessPonte,Haroldo de AraújoMaul,Alexandre MichelAlvarenga,Evandro de Azevedoeng2003-02-28T00:00:00Zoai:scielo:S1516-14392002000400008Revistahttp://www.scielo.br/mrPUBhttps://old.scielo.br/oai/scielo-oai.phpdedz@power.ufscar.br1980-53731516-1439opendoar:2003-02-28T00:00Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)false
dc.title.none.fl_str_mv Analysis of Electrochemical Porosity of Phosphatized Coatings on Galvanized Steel Substrate
title Analysis of Electrochemical Porosity of Phosphatized Coatings on Galvanized Steel Substrate
spellingShingle Analysis of Electrochemical Porosity of Phosphatized Coatings on Galvanized Steel Substrate
Ponte,Haroldo de Araújo
porosity
coating discontinuities
phosphate
voltammetric anodic dissolution
title_short Analysis of Electrochemical Porosity of Phosphatized Coatings on Galvanized Steel Substrate
title_full Analysis of Electrochemical Porosity of Phosphatized Coatings on Galvanized Steel Substrate
title_fullStr Analysis of Electrochemical Porosity of Phosphatized Coatings on Galvanized Steel Substrate
title_full_unstemmed Analysis of Electrochemical Porosity of Phosphatized Coatings on Galvanized Steel Substrate
title_sort Analysis of Electrochemical Porosity of Phosphatized Coatings on Galvanized Steel Substrate
author Ponte,Haroldo de Araújo
author_facet Ponte,Haroldo de Araújo
Maul,Alexandre Michel
Alvarenga,Evandro de Azevedo
author_role author
author2 Maul,Alexandre Michel
Alvarenga,Evandro de Azevedo
author2_role author
author
dc.contributor.author.fl_str_mv Ponte,Haroldo de Araújo
Maul,Alexandre Michel
Alvarenga,Evandro de Azevedo
dc.subject.por.fl_str_mv porosity
coating discontinuities
phosphate
voltammetric anodic dissolution
topic porosity
coating discontinuities
phosphate
voltammetric anodic dissolution
description This work refers to the application of a Voltammetric Anodic Dissolution (VAD) Technique in the analysis of coating discontinuities, focusing on pores and cracks that exposed the substrate. An evaluation was made of the influence of several parameters, such as the concentration of the passivation solution and sweep rate (SR), on the substrate passivation process and on the porosity indexes of tricationic phosphate coatings of Fe/Zn/Mn. The phosphatization process used was a commercial tricationic Fe/Zn/Mn phosphate bath applied on a galvanized steel (GS) substrate. Once the best experimental conditions for the use of the VAD technique had been defined, the grain size and layer weight were related to porosity indexes. The porosity was found to show a tendency to decrease with increasing grain size. The VAD technique consists of the anodic polarization of the substrate/coating system and measurement of the charge density involved in the substrate passivation process. A quantitative porosity index was obtained by comparing the passivation charge density of the substrate without coating (standard passivation charge density) and the passivation charge of the coated substrate.
publishDate 2002
dc.date.none.fl_str_mv 2002-10-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392002000400008
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392002000400008
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S1516-14392002000400008
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv ABM, ABC, ABPol
publisher.none.fl_str_mv ABM, ABC, ABPol
dc.source.none.fl_str_mv Materials Research v.5 n.4 2002
reponame:Materials research (São Carlos. Online)
instname:Universidade Federal de São Carlos (UFSCAR)
instacron:ABM ABC ABPOL
instname_str Universidade Federal de São Carlos (UFSCAR)
instacron_str ABM ABC ABPOL
institution ABM ABC ABPOL
reponame_str Materials research (São Carlos. Online)
collection Materials research (São Carlos. Online)
repository.name.fl_str_mv Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)
repository.mail.fl_str_mv dedz@power.ufscar.br
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