Inhibition of steel corrosion in HCl media by phosphite compound
Identifieur interne : 000764 ( Main/Exploration ); précédent : 000763; suivant : 000765Inhibition of steel corrosion in HCl media by phosphite compound
Auteurs : L. Herrag [Maroc] ; B. Hammouti [Maroc] ; S. Elkadiri [Maroc] ; B. El Bali [Maroc] ; M. Lachkar [Maroc] ; R. Ouarsal [Maroc]Source :
- Pigment & Resin Technology [ 0369-9420 ] ; 2008-05-23.
Abstract
Purpose The purpose of this paper is to investigate the inhibitive effect of the phosphite NaCoH2PO33H2O PhCo for the corrosion of mild steel in HCl solutions. The study is another trial to find a mineral inhibitor for mild steel corrosion. Designmethodologyapproach The inhibitory effect has been evaluated by gravimetric and polarisation techniques at various temperatures. The type of adsorption inhibition and adsorption and kinetic data are determined. Findings Results show that PhCo inhibits the corrosion of steel in acidic solution. The inhibition efficiency at 308K increases with the inhibitor concentration to reach 96 per cent for 104M, and then decreases at higher temperatures. Kinetic parameters such as Ea, Ha and Sa were calculated. The adsorption of inhibitor obeys the Langmuir isotherm model. Thermodynamic parameters of adsorption including Gad, Had, Sad, and Keqad were calculated in the presence of inhibitor. Research limitationsimplications Electrochemical studies polarization method show the partial action of inhibitor on anodic and cathodic reactions of the corrosion inhibition. Practical implications The efficiency of the tested phosphite increases with its concentration to reach 96 per cent. It can be used in chemical cleaning and pickling processes at moderate temperature. Originalityvalue This paper reveals the possible application of phosphites as environmentally valid inhibitors for corrosion under the specified conditions.
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DOI: 10.1108/03699420810871011
Affiliations:
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Ouarsal</name><affiliation wicri:level="1"><country xml:lang="fr">Maroc</country><wicri:regionArea>Laboratoire d'Ingnierie des Matriaux Organomtalliques et Molculaires, Facult des Sciences, Fs</wicri:regionArea><wicri:noRegion>Fs</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Pigment & Resin Technology</title><idno type="ISSN">0369-9420</idno><imprint><publisher>Emerald Group Publishing Limited</publisher><date type="published" when="2008-05-23">2008-05-23</date><biblScope unit="volume">37</biblScope><biblScope unit="issue">3</biblScope><biblScope unit="page" from="167">167</biblScope><biblScope unit="page" to="172">172</biblScope></imprint><idno type="ISSN">0369-9420</idno></series><idno type="istex">946E849B0738AFEF2DB50D492CAD2D2C0CC7C652</idno><idno type="DOI">10.1108/03699420810871011</idno><idno type="filenameID">1290370306</idno><idno type="original-pdf">1290370306.pdf</idno><idno type="href">03699420810871011.pdf</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0369-9420</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">Purpose The purpose of this paper is to investigate the inhibitive effect of the phosphite NaCoH2PO33H2O PhCo for the corrosion of mild steel in HCl solutions. The study is another trial to find a mineral inhibitor for mild steel corrosion. Designmethodologyapproach The inhibitory effect has been evaluated by gravimetric and polarisation techniques at various temperatures. The type of adsorption inhibition and adsorption and kinetic data are determined. Findings Results show that PhCo inhibits the corrosion of steel in acidic solution. The inhibition efficiency at 308K increases with the inhibitor concentration to reach 96 per cent for 104M, and then decreases at higher temperatures. Kinetic parameters such as Ea, Ha and Sa were calculated. The adsorption of inhibitor obeys the Langmuir isotherm model. Thermodynamic parameters of adsorption including Gad, Had, Sad, and Keqad were calculated in the presence of inhibitor. Research limitationsimplications Electrochemical studies polarization method show the partial action of inhibitor on anodic and cathodic reactions of the corrosion inhibition. Practical implications The efficiency of the tested phosphite increases with its concentration to reach 96 per cent. It can be used in chemical cleaning and pickling processes at moderate temperature. Originalityvalue This paper reveals the possible application of phosphites as environmentally valid inhibitors for corrosion under the specified conditions.</div></front></TEI><affiliations><list><country><li>Maroc</li></country></list><tree><country name="Maroc"><noRegion><name sortKey="Herrag, L" sort="Herrag, L" uniqKey="Herrag L" first="L." last="Herrag">L. Herrag</name></noRegion><name sortKey="El Bali, B" sort="El Bali, B" uniqKey="El Bali B" first="B." last="El Bali">B. El Bali</name><name sortKey="Elkadiri, S" sort="Elkadiri, S" uniqKey="Elkadiri S" first="S." last="Elkadiri">S. Elkadiri</name><name sortKey="Hammouti, B" sort="Hammouti, B" uniqKey="Hammouti B" first="B." last="Hammouti">B. Hammouti</name><name sortKey="Lachkar, M" sort="Lachkar, M" uniqKey="Lachkar M" first="M." last="Lachkar">M. Lachkar</name><name sortKey="Ouarsal, R" sort="Ouarsal, R" uniqKey="Ouarsal R" first="R." last="Ouarsal">R. Ouarsal</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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