LrgpV1, Main, Exploration, bibRecord, 001812

Cementation and corrosion at a RDE: Changes in flow and transfer phenomena induced by surface roughness

Identifieur interne : 001812 ( Main/Exploration ); précédent : 001811; suivant : 001813

Cementation and corrosion at a RDE: Changes in flow and transfer phenomena induced by surface roughness

Auteurs : C. Alemany [France] ; M. Aurousseau [France] ; François Lapicque [France] ; P. Ozil [France]

Source :

Journal of applied electrochemistry [ 0021-891X ] ; 2002.

RBID : Pascal:03-0182277

Descripteurs français

Pascal (Inist)
- Cémentation, Corrosion, Cinétique, Phénomène transport, Transfert masse, Electrode disque tournant, Système redox, Argent I Ion, Cuivre, Cadmium II Ion, Zinc, Cérium IV Ion, Chrome VI Ion, Sulfate, Nitrate, Morphologie, Structure surface, Microscopie électronique balayage, Spectrométrie dispersive, Dispersion énergie, Rayon X.
Wicri :
- topic : Corrosion, Cuivre, Zinc.

English descriptors

KwdEn :
- Cadmium II Ions, Carburizing, Cerium IV Ions, Chromium VI Ions, Copper, Corrosion, Dispersive spectrometry, Energy dispersion, Kinetics, Mass transfer, Morphology, Nitrates, Redox system, Rotating disk electrode, Scanning electron microscopy, Silver I Ions, Sulfates, Surface structure, Transport process, X ray, Zinc.

Abstract

Cementation and corrosion were investigated in a batch cell to highlight the improvement of the kinetics observed after a certain lapse of time. Experiments on cementation with the Cd(II)/Zn and Ag(I)/Cu systems, and on corrosion with the Ce(IV)/Zn and Cr(VI)/Zn couples, were carried out on a rotating disc electrode immersed in relatively concentrated solutions. Time variations of the concentration of the reacting species and SEM observations showed that the change in reaction kinetics was due to the roughness of the changing surface of the electrode, depending on the chemical system considered. For corrosion, the average roughness was shown to exceed the thickness of the Nernst diffusion layer, and the rougher surface created allows local flow disruption and mass transfer enhancement. Besides, corrosion by Cr(VI) species results in greater roughness of the metal surface with more significant flow disruption than with Ce(IV) at the same concentration.

Affiliations:

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Le document en format XML

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<term>Cerium IV Ions</term>
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<term>Copper</term>
<term>Corrosion</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Cémentation</term>
<term>Corrosion</term>
<term>Cinétique</term>
<term>Phénomène transport</term>
<term>Transfert masse</term>
<term>Electrode disque tournant</term>
<term>Système redox</term>
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<term>Cadmium II Ion</term>
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<term>Nitrate</term>
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<term>Structure surface</term>
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<term>Spectrométrie dispersive</term>
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<term>Rayon X</term>
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<front><div type="abstract" xml:lang="en">Cementation and corrosion were investigated in a batch cell to highlight the improvement of the kinetics observed after a certain lapse of time. Experiments on cementation with the Cd(II)/Zn and Ag(I)/Cu systems, and on corrosion with the Ce(IV)/Zn and Cr(VI)/Zn couples, were carried out on a rotating disc electrode immersed in relatively concentrated solutions. Time variations of the concentration of the reacting species and SEM observations showed that the change in reaction kinetics was due to the roughness of the changing surface of the electrode, depending on the chemical system considered. For corrosion, the average roughness was shown to exceed the thickness of the Nernst diffusion layer, and the rougher surface created allows local flow disruption and mass transfer enhancement. Besides, corrosion by Cr(VI) species results in greater roughness of the metal surface with more significant flow disruption than with Ce(IV) at the same concentration.</div>
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Cementation and corrosion at a RDE: Changes in flow and transfer phenomena induced by surface roughness

Cementation and corrosion at a RDE: Changes in flow and transfer phenomena induced by surface roughness

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri