Corrosion evaluation of CA-50 steel in pore waters extracted from cement pastes with steel slags using electrochemical techniques
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Revista IBRACON de Estruturas e Materiais |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1983-41952021000200205 |
Resumo: | Abstract There is an interest in the cement industry in the use of steel slags in cement, but chemical and/or pyrometallurgical modifications are necessary to reduce the free CaO, MgO, and iron contents. However, the potential effects of its application in the reinforcement corrosion, whether in solid (concrete) or liquid medium (pore water), have not yet been addressed. In this context, the present study shows a corrosion analysis of the CA-50 steel in pore water medium extracted from cement pastes with 25% by weight of steel slag, in natural state or pyrometallurgical modified, by means of polarization curves, electrochemical impedance spectroscopy (EIS), and microstructural analysis. For comparison, tests were performed in pore waters presented in literature and representative from Ordinary Portland Cement (OPC) or activated Blast Furnace Slag (BFS) and, to simulate aggressive conditions, 1.0% NaCl was also added to the solutions. The steel remained passive in all media without 1.0% NaCl, but the EIS results indicated more protective characteristics in the medium simulating the modified steel slag. The main corrosion product identified by SEM images after the tests on aggressive media was lepidocrocite (γ-FeOOH), and the steel did not corrode in media with steel slags and 1.0% NaCl. This was attributed mainly to the higher alkalinity of these media in comparison to other usual pore waters, promoting longer protection of the steel. |
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Corrosion evaluation of CA-50 steel in pore waters extracted from cement pastes with steel slags using electrochemical techniquespore watercorrosionsteel slagelectrochemical impedance spectroscopyAbstract There is an interest in the cement industry in the use of steel slags in cement, but chemical and/or pyrometallurgical modifications are necessary to reduce the free CaO, MgO, and iron contents. However, the potential effects of its application in the reinforcement corrosion, whether in solid (concrete) or liquid medium (pore water), have not yet been addressed. In this context, the present study shows a corrosion analysis of the CA-50 steel in pore water medium extracted from cement pastes with 25% by weight of steel slag, in natural state or pyrometallurgical modified, by means of polarization curves, electrochemical impedance spectroscopy (EIS), and microstructural analysis. For comparison, tests were performed in pore waters presented in literature and representative from Ordinary Portland Cement (OPC) or activated Blast Furnace Slag (BFS) and, to simulate aggressive conditions, 1.0% NaCl was also added to the solutions. The steel remained passive in all media without 1.0% NaCl, but the EIS results indicated more protective characteristics in the medium simulating the modified steel slag. The main corrosion product identified by SEM images after the tests on aggressive media was lepidocrocite (γ-FeOOH), and the steel did not corrode in media with steel slags and 1.0% NaCl. This was attributed mainly to the higher alkalinity of these media in comparison to other usual pore waters, promoting longer protection of the steel.IBRACON - Instituto Brasileiro do Concreto2021-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1983-41952021000200205Revista IBRACON de Estruturas e Materiais v.14 n.2 2021reponame:Revista IBRACON de Estruturas e Materiaisinstname:Instituto Brasileiro do Concreto (IBRACON)instacron:IBRACON10.1590/s1983-41952021000200009info:eu-repo/semantics/openAccessVieira,Renan EspositoMennucci,Marina MartinsQuarcioni,Valdecir AngeloMelo,Hercílio Gomes deeng2021-01-21T00:00:00Zoai:scielo:S1983-41952021000200205Revistahttp://www.revistas.ibracon.org.br/index.php/riemhttps://old.scielo.br/oai/scielo-oai.phpeditores.riem@gmail.com||arlene@ibracon.org.br1983-41951983-4195opendoar:2021-01-21T00:00Revista IBRACON de Estruturas e Materiais - Instituto Brasileiro do Concreto (IBRACON)false |
dc.title.none.fl_str_mv |
Corrosion evaluation of CA-50 steel in pore waters extracted from cement pastes with steel slags using electrochemical techniques |
title |
Corrosion evaluation of CA-50 steel in pore waters extracted from cement pastes with steel slags using electrochemical techniques |
spellingShingle |
Corrosion evaluation of CA-50 steel in pore waters extracted from cement pastes with steel slags using electrochemical techniques Vieira,Renan Esposito pore water corrosion steel slag electrochemical impedance spectroscopy |
title_short |
Corrosion evaluation of CA-50 steel in pore waters extracted from cement pastes with steel slags using electrochemical techniques |
title_full |
Corrosion evaluation of CA-50 steel in pore waters extracted from cement pastes with steel slags using electrochemical techniques |
title_fullStr |
Corrosion evaluation of CA-50 steel in pore waters extracted from cement pastes with steel slags using electrochemical techniques |
title_full_unstemmed |
Corrosion evaluation of CA-50 steel in pore waters extracted from cement pastes with steel slags using electrochemical techniques |
title_sort |
Corrosion evaluation of CA-50 steel in pore waters extracted from cement pastes with steel slags using electrochemical techniques |
author |
Vieira,Renan Esposito |
author_facet |
Vieira,Renan Esposito Mennucci,Marina Martins Quarcioni,Valdecir Angelo Melo,Hercílio Gomes de |
author_role |
author |
author2 |
Mennucci,Marina Martins Quarcioni,Valdecir Angelo Melo,Hercílio Gomes de |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Vieira,Renan Esposito Mennucci,Marina Martins Quarcioni,Valdecir Angelo Melo,Hercílio Gomes de |
dc.subject.por.fl_str_mv |
pore water corrosion steel slag electrochemical impedance spectroscopy |
topic |
pore water corrosion steel slag electrochemical impedance spectroscopy |
description |
Abstract There is an interest in the cement industry in the use of steel slags in cement, but chemical and/or pyrometallurgical modifications are necessary to reduce the free CaO, MgO, and iron contents. However, the potential effects of its application in the reinforcement corrosion, whether in solid (concrete) or liquid medium (pore water), have not yet been addressed. In this context, the present study shows a corrosion analysis of the CA-50 steel in pore water medium extracted from cement pastes with 25% by weight of steel slag, in natural state or pyrometallurgical modified, by means of polarization curves, electrochemical impedance spectroscopy (EIS), and microstructural analysis. For comparison, tests were performed in pore waters presented in literature and representative from Ordinary Portland Cement (OPC) or activated Blast Furnace Slag (BFS) and, to simulate aggressive conditions, 1.0% NaCl was also added to the solutions. The steel remained passive in all media without 1.0% NaCl, but the EIS results indicated more protective characteristics in the medium simulating the modified steel slag. The main corrosion product identified by SEM images after the tests on aggressive media was lepidocrocite (γ-FeOOH), and the steel did not corrode in media with steel slags and 1.0% NaCl. This was attributed mainly to the higher alkalinity of these media in comparison to other usual pore waters, promoting longer protection of the steel. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-01-01 |
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=S1983-41952021000200205 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1983-41952021000200205 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/s1983-41952021000200009 |
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 |
IBRACON - Instituto Brasileiro do Concreto |
publisher.none.fl_str_mv |
IBRACON - Instituto Brasileiro do Concreto |
dc.source.none.fl_str_mv |
Revista IBRACON de Estruturas e Materiais v.14 n.2 2021 reponame:Revista IBRACON de Estruturas e Materiais instname:Instituto Brasileiro do Concreto (IBRACON) instacron:IBRACON |
instname_str |
Instituto Brasileiro do Concreto (IBRACON) |
instacron_str |
IBRACON |
institution |
IBRACON |
reponame_str |
Revista IBRACON de Estruturas e Materiais |
collection |
Revista IBRACON de Estruturas e Materiais |
repository.name.fl_str_mv |
Revista IBRACON de Estruturas e Materiais - Instituto Brasileiro do Concreto (IBRACON) |
repository.mail.fl_str_mv |
editores.riem@gmail.com||arlene@ibracon.org.br |
_version_ |
1754193606441172992 |