The synergetic effect of chloride and sulphate on pitting corrosion of copper

Duthil, J.-P.; Mankowski, Georges; Giusti, Aleardo

doi:10.1016/s0010-938x(96)88250-3

Cited by 77 publications

(58 citation statements)

References 11 publications

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“…5 The semicircles in the high frequency region are generally associated with the relaxation of the electrical double-layer with their diameters representing the charge transfer resistance 38-41. The smaller the charge transfer resistance, the faster the corrosion rate.…”

Section: T a B L Ementioning

confidence: 99%

Inhibition of copper corrosion in chloride solution by caffeine isolated from black tea

Gudić

Oguzie²,

Radonić³

et al. 2014

Maced. J. Chem. Chem. Eng.

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Caffeine (1,3,7-trimethylxanthine) was isolated from black tea and characterized using different physical methods (determination of melting point, thin layer chromatography, FTIR spectroscopy and UV spectrophotometry). The corrosion inhibition performance of the caffeine isolate on copper corrosion in neutral 0.5 mol l -1 NaCl solution was investigated using potentiodynamic polarization and electrochemical impedance spectroscopy measurements. The obtained results show that caffeine effectively inhibited the corrosion reaction in the chloride solution with an inhibition efficiency of up to  92%. Furthermore, caffeine was found to function essentially as a cathodic inhibitor by adsorption on the copper surface according to the Langmuir adsorption isotherm. The adsorption free energy of  -37 kJ mol -1 indicates strong adsorption of the caffeine on the metal surface. Quantum chemical computations and molecular dynamics simulations were adapted to understudy the adsorption of a single caffeine molecule as well as a polymeric cluster of caffeine molecules on a model Cu surface at a molecular level and was consistent with the experimental findings.Keywords: adsorption isotherm; caffeine; copper; corrosion; inhibition ИНХИБИЦИЈА НА БАКАРНА КОРОЗИЈА ВО ХЛОРИДЕН РАСТВОР НА КОФЕИН ИЗОЛИРАН ОД ЦРН ЧАЈКофеин (1,3,7-триметилксантин) изолиран од црн чај е карактеризиран со употреба на физички методи (температура на топење, тенкослојна хроматографија, FTIR спектроскопија и UV спектрометрија). Способноста за инхибиција на корозијата на изолираниот екстракт врз бакарот е испитувана во неутрален 0,5 mol l -1 NaCl раствор со примена на потенциодинамичка поларизација и на електрохемиска импедансна спектроскопија. Добиените резултати покажуваат дека кофеинот ефикасно ја инхибира реакцијата на корозија во хлориден раствор, при што ефикасноста на инхибицијата изнесува и до  92%. Покрај тоа, утврдено е дека кофеинот во основа служи како катоден инхибитор со атсорпција на бакарната површина согласно атсорпционата изотерма на Langmuir. Вредноста на атсорпционата слободна енергија од  -37 kJ mol -1 укажува силна атсорпција на кофеинот врз металната површина. Беа применети квантнохемиски пресметки и молекуларнодинамички симулации за подобро разбирање на атсорпцијата на единична молекула на кофеинот, како и полимерен кластер на кофеински молекули на модел на бакарната површина на молекулско ниво и се покажа дека се во согласност со експерименталните резултати.

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Section: T a B L Ementioning

confidence: 99%

Inhibition of copper corrosion in chloride solution by caffeine isolated from black tea

Gudić

Oguzie²,

Radonić³

et al. 2014

Maced. J. Chem. Chem. Eng.

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“…Sulfate and sulfite ions were also found to act as inhibitors, although SO 3 2-is oxidized in solution to SO 4 2-ion. Interestingly, sulfate ions exhibit a synergistic effect when added to chloride ions increasing the corrosion rate in case of pure copper (Mankowski et al, 1997;Duthil et al, 1996). Their accelerating effect is a consequence of their large degree of mobility and interaction with the oxide film .…”

Section: Effect Of Composition Microstructure and The Environment Onmentioning

confidence: 99%

Prediction of Corrosion of Advanced Materials and Fabricated Components

Anderko¹,

Engelhardt²,

Łencka³

et al. 2007

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“…19 Generally speaking, for most of the metallic materials, the higher c H+ means that the pitting is more easily induced. However, the uniform films instead of pits are observed on the surfaces of copper in the acidic solutions (Figs.…”

Section: The I-t Curves and Sem Imagesmentioning

confidence: 99%

Investigation into the Anodic Dissolution Processes of Copper in Neutral and Acidic Sulfate Solutions with the In-line Digital Holography

Jiao

et al. 2016

Electrochemistry

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The films formed on the surface of copper during its anodic dissolution in the neutral or acidic sulfate solution were studied with the in-line digital holography. The results showed that the mixture films were formed on the surface of copper in the neutral or acidic sulfate solution: the inner oxide film and the outer salt film. Although there are defects in the oxide film caused by the sulfate ions, the oxide film other than the salt film mainly inhibits the anodic dissolution at the high anodic potentials.

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The synergetic effect of chloride and sulphate on pitting corrosion of copper

Cited by 77 publications

References 11 publications

Inhibition of copper corrosion in chloride solution by caffeine isolated from black tea

Inhibition of copper corrosion in chloride solution by caffeine isolated from black tea

Prediction of Corrosion of Advanced Materials and Fabricated Components

Investigation into the Anodic Dissolution Processes of Copper in Neutral and Acidic Sulfate Solutions with the In-line Digital Holography

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