The Inhibition of Mild Steel Corrosion in an Acidic Medium by the Aqueous Extract of Leaves of Polyalthia Longifolia

Detalhes bibliográficos
Autor(a) principal: Chinyem,O.
Data de Publicação: 2014
Outros Autores: Ogbeifun,D. E., Edema,M. O.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
Texto Completo: http://scielo.pt/scielo.php?script=sci_arttext&pid=S0872-19042014000500002
Resumo: The inhibitive effect of aqueous extract of leaves of Polyalthia longifolia on the corrosion of mild steel was studied using the gravimetric (weight loss) method at the temperatures 303 and 318 K. The results show that the aqueous extract of Polyalthia longifolia leaves inhibited the corrosion of mild steel in dilute H2SO4 solution. It was found that the inhibition efficiency increased with inhibitor concentration and decreased with rise in temperature. Values of the activation energy of the inhibited corrosion reaction range between 45.40 kJ/mol and 62.22 kJ/mol. This is much higher than the 25.74 kJ/mol obtained for the blank. The adsorption of the extract was spontaneous and occurs according to Flory-Huggins adsorption isotherm. The corrosion inhibition of Polyalthia longifolia leaves extract was attributed to the adsorption of phytochemical molecules present in the extract onto the surface of the mild steel. Physical adsorption mechanism has been proposed for the adsorption of the inhibitor.
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spelling The Inhibition of Mild Steel Corrosion in an Acidic Medium by the Aqueous Extract of Leaves of Polyalthia LongifoliaPolyalthia longifoliamild steelcorrosioninhibitoradsorptionThe inhibitive effect of aqueous extract of leaves of Polyalthia longifolia on the corrosion of mild steel was studied using the gravimetric (weight loss) method at the temperatures 303 and 318 K. The results show that the aqueous extract of Polyalthia longifolia leaves inhibited the corrosion of mild steel in dilute H2SO4 solution. It was found that the inhibition efficiency increased with inhibitor concentration and decreased with rise in temperature. Values of the activation energy of the inhibited corrosion reaction range between 45.40 kJ/mol and 62.22 kJ/mol. This is much higher than the 25.74 kJ/mol obtained for the blank. The adsorption of the extract was spontaneous and occurs according to Flory-Huggins adsorption isotherm. The corrosion inhibition of Polyalthia longifolia leaves extract was attributed to the adsorption of phytochemical molecules present in the extract onto the surface of the mild steel. Physical adsorption mechanism has been proposed for the adsorption of the inhibitor.Sociedade Portuguesa de Electroquímica2014-09-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articletext/htmlhttp://scielo.pt/scielo.php?script=sci_arttext&pid=S0872-19042014000500002Portugaliae Electrochimica Acta v.32 n.5 2014reponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiainstacron:RCAAPenghttp://scielo.pt/scielo.php?script=sci_arttext&pid=S0872-19042014000500002Chinyem,O.Ogbeifun,D. E.Edema,M. O.info:eu-repo/semantics/openAccess2024-02-06T17:07:16Zoai:scielo:S0872-19042014000500002Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireinfo@rcaap.ptopendoar:https://opendoar.ac.uk/repository/71602025-05-28T12:56:34.665927Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiafalse
dc.title.none.fl_str_mv The Inhibition of Mild Steel Corrosion in an Acidic Medium by the Aqueous Extract of Leaves of Polyalthia Longifolia
title The Inhibition of Mild Steel Corrosion in an Acidic Medium by the Aqueous Extract of Leaves of Polyalthia Longifolia
spellingShingle The Inhibition of Mild Steel Corrosion in an Acidic Medium by the Aqueous Extract of Leaves of Polyalthia Longifolia
Chinyem,O.
Polyalthia longifolia
mild steel
corrosion
inhibitor
adsorption
title_short The Inhibition of Mild Steel Corrosion in an Acidic Medium by the Aqueous Extract of Leaves of Polyalthia Longifolia
title_full The Inhibition of Mild Steel Corrosion in an Acidic Medium by the Aqueous Extract of Leaves of Polyalthia Longifolia
title_fullStr The Inhibition of Mild Steel Corrosion in an Acidic Medium by the Aqueous Extract of Leaves of Polyalthia Longifolia
title_full_unstemmed The Inhibition of Mild Steel Corrosion in an Acidic Medium by the Aqueous Extract of Leaves of Polyalthia Longifolia
title_sort The Inhibition of Mild Steel Corrosion in an Acidic Medium by the Aqueous Extract of Leaves of Polyalthia Longifolia
author Chinyem,O.
author_facet Chinyem,O.
Ogbeifun,D. E.
Edema,M. O.
author_role author
author2 Ogbeifun,D. E.
Edema,M. O.
author2_role author
author
dc.contributor.author.fl_str_mv Chinyem,O.
Ogbeifun,D. E.
Edema,M. O.
dc.subject.por.fl_str_mv Polyalthia longifolia
mild steel
corrosion
inhibitor
adsorption
topic Polyalthia longifolia
mild steel
corrosion
inhibitor
adsorption
description The inhibitive effect of aqueous extract of leaves of Polyalthia longifolia on the corrosion of mild steel was studied using the gravimetric (weight loss) method at the temperatures 303 and 318 K. The results show that the aqueous extract of Polyalthia longifolia leaves inhibited the corrosion of mild steel in dilute H2SO4 solution. It was found that the inhibition efficiency increased with inhibitor concentration and decreased with rise in temperature. Values of the activation energy of the inhibited corrosion reaction range between 45.40 kJ/mol and 62.22 kJ/mol. This is much higher than the 25.74 kJ/mol obtained for the blank. The adsorption of the extract was spontaneous and occurs according to Flory-Huggins adsorption isotherm. The corrosion inhibition of Polyalthia longifolia leaves extract was attributed to the adsorption of phytochemical molecules present in the extract onto the surface of the mild steel. Physical adsorption mechanism has been proposed for the adsorption of the inhibitor.
publishDate 2014
dc.date.none.fl_str_mv 2014-09-01
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://scielo.pt/scielo.php?script=sci_arttext&pid=S0872-19042014000500002
url http://scielo.pt/scielo.php?script=sci_arttext&pid=S0872-19042014000500002
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv http://scielo.pt/scielo.php?script=sci_arttext&pid=S0872-19042014000500002
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 Portuguesa de Electroquímica
publisher.none.fl_str_mv Sociedade Portuguesa de Electroquímica
dc.source.none.fl_str_mv Portugaliae Electrochimica Acta v.32 n.5 2014
reponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
instacron:RCAAP
instname_str FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
instacron_str RCAAP
institution RCAAP
reponame_str Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
collection Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
repository.name.fl_str_mv Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
repository.mail.fl_str_mv info@rcaap.pt
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