Adsorption and inhibitive properties of some new Mannich bases of Isatin derivatives on corrosion of mild steel in acidic media

Ahamad, Ishtiaque; Prasad, R.; Quraishi, M.A.

doi:10.1016/j.corsci.2010.01.015

Cited by 478 publications

(177 citation statements)

References 56 publications

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“…This behavior can be explicated as a result of the replacement process of water molecules during adsorption of SSE on the steel surface [27]. This observation is in agreement with many studies that have been reported by several authors [31][32][33][34][35].…”

Section: Activation Parameters Of the Corrosion Processsupporting

confidence: 88%

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Saccocalyx satureioides as corrosion inhibitor for carbon steel in acid solution

et al. 2016

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The inhibitory effect of the crude ethyl acetate extract of Saccocalyx satureioides was estimated on the corrosion of carbon steel (X52) in 1 M HCl solution sing weight loss measurement, potentiodynamic polarization, electrochemical impedance spectroscopy and scanning electron microscopy techniques. Potentiodynamic polarization curves indicated that the plants extract behaves as a mixed-type inhibitor. The adsorption of the inhibitor on the carbon steel surface was found to follow Freundlich adsorption isotherm. The free energies, enthalpies and entropies for the adsorption and dissolution process were discussed in details. The inhibiting action increases with increasing concentration of the extract. The results obtained show that the extract of the aerial parts of Saccocalyx satureioides could serve as an effective corrosion inhibitor of carbon steel (X52) in hydrochloric acid medium.

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Section: Activation Parameters Of the Corrosion Processsupporting

confidence: 88%

“…It was demonstrated from the data that the addition of SSE shrank the corrosion current density (i corr ). The decrease may be due to the adsorption of the inhibitor on metal/acid interface [35].…”

Section: Polarization Measurementmentioning

confidence: 99%

Saccocalyx satureioides as corrosion inhibitor for carbon steel in acid solution

et al. 2016

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“…It is obvious from Table-7 that the value of R ct increased with increasing concentration of the inhibitor. This can be ascribed to the formation of protective film at the carbon steelsulphuric acid interface [45]. The decrease in C dl values shows …”

Section: Weight Loss Measurementsmentioning

confidence: 99%

Mitigation of Acid Corrosion on Carbon Steel by Naturally Occurring Gum Exudate

Manickam¹,

Dheenadhayalan²,

Jaganathan³

2018

Asian J. Chem.

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Gum exudates of Azadirachta indica (GAI) was tested as corrosion inhibitor for carbon steel in 1 N H2SO4 by means of different techniques viz., gravimetric experiments, electrochemical polarization and impedance studies, IR and SEM techniques. Nature of adsorption is reported and it follows Langmuir isotherm. Polarization method indicated mixed mode behaviour of the inhibitor. AC impedance studies supported mitigation effects of gum exudates of Azadirachta indica. IR and SEM studies reveal the protection of carbon steel through adsorption.

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“…[17][18][19] O desenvolvimento de produtos capazes de inibir a corrosão proveniente de um meio rico em ânions cloreto, em especial oriundos do ambiente marinho, tem se mostrado uma promissora fonte de pesquisa para indústrias petrolíferas, especialmente por conta das maiores reservas de petróleo estarem localizadas no mar. Um dos principais fatores associados à aplicabilidade de um inibidor de corrosão em meio aquoso neutro ou salino consiste na problemática da solubilidade.…”

Section: Introductionunclassified

Inibição à corrosão de aço-carbono em meio salino pelo heterociclo isatina veiculado em microemulsões

Souza¹,

Rossi²,

Dantas³

et al. 2017

Quim. Nova

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Polar microemulsion systems (SME) based on saponified coconut oil (OCS) as surfactant were prepared in order to increase the solubility of the heterocycle isatin (IST) aiming at its application as corrosion inhibitor against AISI 1020 mild steel, in saline medium. The adsorptions phenomena of the tested SME systems (SME-OCS1-IST and SME-OCS2-IST) in the liquid/gas interface were evaluated by surface tension measurements which do not show significant differences in the presence of ion Cl -. The free energy values of the micellization proved the occurrence of spontaneous process. The corrosion inhibition effectiveness of SME-OCS2, SME-OCS1-IST and SME-OCS2-IST samples was evaluated in 0.5% aqueous NaCl using voltammetry linear scan method (LPR). The maximum efficiency findings were 73.2% for SME-OCS2, 88.2% for SME-OCS2-IST and 97.6% for SME-OCS1-IST. The spontaneity of the adsorption phenomena was also observed in the liquid/metal interface by analyzes of the adsorption free energy. In addition, since computational calculations have been found as a very relevant tool in the corrosion field, a theoretical study was performed in attempt to give support to the observed experimental results, in which B3LYP and 6-311++G(d,p) were applied aiming at investigation of geometry, electronic density aspects, HOMO-LUMO energy gap, as well as the binding between isatin and metal surface.Keywords: isatin, microemulsion o/w systems; corrosion inhibitor; saline medium; LPR electrochemical methodology; theoretical study using B3LYP and 6-311++G(d,p). INTRODUÇÃOA corrosão acarreta prejuízos financeiros e operacionais significativos, além de danos ambientais e riscos operacionais. Em função de causar deterioração de equipamentos e estruturas metálicas, o fenômeno da corrosão se destaca como um dos maiores problemas das indústrias da atualidade. O aço-carbono, em função de suas propriedades, simples fabricação e baixo custo, é um dos principais tipos de aço empregados na indústria, no entanto, a exemplo de outros materiais, está sujeito à corrosão por diversos meios. Por esta razão, a demanda, em todo o mundo, por agentes inibidores de corrosão se mostra altamente atrativa para o setor industrial. [1][2][3][4][5][6][7][8] Várias pesquisas vêm sendo desenvolvidas no sentido de controlar a corrosão. Dentre os métodos mais utilizados, destaca-se o uso de inibidores de corrosão por ação de películas protetoras que se adsorvem às áreas anódicas e catódicas do metal, exercendo controle sobre os processos eletroquímicos que desencadeiam a corrosão. Em função da eficácia de filmes protetores que se formam na interface entre o metal e o meio corrosivo, destaca-se o uso de moléculas orgânicas contendo nitrogênio, oxigênio e enxofre.9-15 Esta proteção está vinculada às interações entre heteroátomos presentes em suas estruturas com a superfície do metal, cuja natureza e carga superficial também influenciam diretamente o processo de adsorção.A isatina (IST) é um composto orgânico heterociclo quem vem sendo amplamente utilizado em pesquisas cientí...

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Adsorption and inhibitive properties of some new Mannich bases of Isatin derivatives on corrosion of mild steel in acidic media

Cited by 478 publications

References 56 publications

Saccocalyx satureioides as corrosion inhibitor for carbon steel in acid solution

Saccocalyx satureioides as corrosion inhibitor for carbon steel in acid solution

Mitigation of Acid Corrosion on Carbon Steel by Naturally Occurring Gum Exudate

Inibição à corrosão de aço-carbono em meio salino pelo heterociclo isatina veiculado em microemulsões

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