Assessment of caffeine adsorption onto mild steel surface as an eco-friendly corrosion inhibitor

Detalhes bibliográficos
Autor(a) principal: Souza,Fernando S. de
Data de Publicação: 2014
Outros Autores: Gonçalves,Reinaldo S., Spinelli,Almir
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Journal of the Brazilian Chemical Society (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532014000100010
Resumo: The adsorption and corrosion-inhibition properties of caffeine as an eco-friendly corrosion inhibitor for mild steel in acid medium were investigated by electrochemical and spectroscopic techniques. Polarization experiments indicated that caffeine behaves as a cathodic-type inhibitor. Impedance data showed that surface coverage increased with caffeine concentration in the range of 1.0 to 10.0 mmol L-1. The maximum inhibition efficiency obtained was 92.4%. The adsorption of the corrosion inhibitor was consistent with the Frumkin adsorption isotherm with a free energy of adsorption of -66.1 kJ mol-1. Contact angle measurements revealed the formation of a hydrophobic protective film, while scanning electron microscopy, energy dispersive spectroscopy and fluorescence experiments clearly verified the presence of caffeine on the surface.
id SBQ-2_543aef7788807e7c5fd00aafd1f0d257
oai_identifier_str oai:scielo:S0103-50532014000100010
network_acronym_str SBQ-2
network_name_str Journal of the Brazilian Chemical Society (Online)
repository_id_str
spelling Assessment of caffeine adsorption onto mild steel surface as an eco-friendly corrosion inhibitormild steelcaffeineadsorptionelectrochemical techniquessurface analysisThe adsorption and corrosion-inhibition properties of caffeine as an eco-friendly corrosion inhibitor for mild steel in acid medium were investigated by electrochemical and spectroscopic techniques. Polarization experiments indicated that caffeine behaves as a cathodic-type inhibitor. Impedance data showed that surface coverage increased with caffeine concentration in the range of 1.0 to 10.0 mmol L-1. The maximum inhibition efficiency obtained was 92.4%. The adsorption of the corrosion inhibitor was consistent with the Frumkin adsorption isotherm with a free energy of adsorption of -66.1 kJ mol-1. Contact angle measurements revealed the formation of a hydrophobic protective film, while scanning electron microscopy, energy dispersive spectroscopy and fluorescence experiments clearly verified the presence of caffeine on the surface.Sociedade Brasileira de Química2014-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532014000100010Journal of the Brazilian Chemical Society v.25 n.1 2014reponame:Journal of the Brazilian Chemical Society (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.5935/0103-5053.20130270info:eu-repo/semantics/openAccessSouza,Fernando S. deGonçalves,Reinaldo S.Spinelli,Almireng2014-01-28T00:00:00Zoai:scielo:S0103-50532014000100010Revistahttp://jbcs.sbq.org.brONGhttps://old.scielo.br/oai/scielo-oai.php||office@jbcs.sbq.org.br1678-47900103-5053opendoar:2014-01-28T00:00Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)false
dc.title.none.fl_str_mv Assessment of caffeine adsorption onto mild steel surface as an eco-friendly corrosion inhibitor
title Assessment of caffeine adsorption onto mild steel surface as an eco-friendly corrosion inhibitor
spellingShingle Assessment of caffeine adsorption onto mild steel surface as an eco-friendly corrosion inhibitor
Souza,Fernando S. de
mild steel
caffeine
adsorption
electrochemical techniques
surface analysis
title_short Assessment of caffeine adsorption onto mild steel surface as an eco-friendly corrosion inhibitor
title_full Assessment of caffeine adsorption onto mild steel surface as an eco-friendly corrosion inhibitor
title_fullStr Assessment of caffeine adsorption onto mild steel surface as an eco-friendly corrosion inhibitor
title_full_unstemmed Assessment of caffeine adsorption onto mild steel surface as an eco-friendly corrosion inhibitor
title_sort Assessment of caffeine adsorption onto mild steel surface as an eco-friendly corrosion inhibitor
author Souza,Fernando S. de
author_facet Souza,Fernando S. de
Gonçalves,Reinaldo S.
Spinelli,Almir
author_role author
author2 Gonçalves,Reinaldo S.
Spinelli,Almir
author2_role author
author
dc.contributor.author.fl_str_mv Souza,Fernando S. de
Gonçalves,Reinaldo S.
Spinelli,Almir
dc.subject.por.fl_str_mv mild steel
caffeine
adsorption
electrochemical techniques
surface analysis
topic mild steel
caffeine
adsorption
electrochemical techniques
surface analysis
description The adsorption and corrosion-inhibition properties of caffeine as an eco-friendly corrosion inhibitor for mild steel in acid medium were investigated by electrochemical and spectroscopic techniques. Polarization experiments indicated that caffeine behaves as a cathodic-type inhibitor. Impedance data showed that surface coverage increased with caffeine concentration in the range of 1.0 to 10.0 mmol L-1. The maximum inhibition efficiency obtained was 92.4%. The adsorption of the corrosion inhibitor was consistent with the Frumkin adsorption isotherm with a free energy of adsorption of -66.1 kJ mol-1. Contact angle measurements revealed the formation of a hydrophobic protective film, while scanning electron microscopy, energy dispersive spectroscopy and fluorescence experiments clearly verified the presence of caffeine on the surface.
publishDate 2014
dc.date.none.fl_str_mv 2014-01-01
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=S0103-50532014000100010
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532014000100010
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.5935/0103-5053.20130270
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 Sociedade Brasileira de Química
publisher.none.fl_str_mv Sociedade Brasileira de Química
dc.source.none.fl_str_mv Journal of the Brazilian Chemical Society v.25 n.1 2014
reponame:Journal of the Brazilian Chemical Society (Online)
instname:Sociedade Brasileira de Química (SBQ)
instacron:SBQ
instname_str Sociedade Brasileira de Química (SBQ)
instacron_str SBQ
institution SBQ
reponame_str Journal of the Brazilian Chemical Society (Online)
collection Journal of the Brazilian Chemical Society (Online)
repository.name.fl_str_mv Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)
repository.mail.fl_str_mv ||office@jbcs.sbq.org.br
_version_ 1750318175680987136

Registros relacionados