Analysis of Electrochemical Porosity of Phosphatized Coatings on Galvanized Steel Substrate
Autor(a) principal: | |
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Data de Publicação: | 2002 |
Outros Autores: | , |
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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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 |
_version_ |
1754212657013981184 |