NickelMaghrebV1, France, Analysis, bibRecord, 000123

Electrochemical corrosion behavior in NaCl medium of zinc-nickel alloys electrodeposited under applied magnetic field

Identifieur interne : 000123 ( France/Analysis ); précédent : 000122; suivant : 000124

Electrochemical corrosion behavior in NaCl medium of zinc-nickel alloys electrodeposited under applied magnetic field

Auteurs : S. Chouchane [Algérie] ; A. Levesque [France] ; P. Zabinski [Pologne] ; R. Rehamnia [Algérie] ; J.-P. Chopart [France]

Source :

Journal of alloys and compounds [ 0925-8388 ] ; 2010.

RBID : Pascal:10-0475147

Descripteurs français

Pascal (Inist)
- Corrosion électrochimique, Propriété électrochimique, Dépôt électrolytique, Revêtement électrodéposé, Effet champ magnétique, Codépôt, Sulfate, Champ intense, Convection, Composition phase, Champ faible, Microstructure, Morphologie surface, Grosseur grain, Chlorure de sodium, Zinc alliage, Nickel alliage, Rugosité, Champ superficiel, Traitement surface, Effet composition, Polarisation, Potentiel corrosion, Microscopie force atomique, NaCl, Zn, 8115P, 8165.

English descriptors

KwdEn :
- Atomic force microscopy, Codeposition, Composition effect, Convection, Corrosion potential, Electrochemical corrosion, Electrochemical properties, Electrodeposited coatings, Electrodeposition, Grain size, High field, Low field, Magnetic field effects, Microstructure, Nickel alloys, Phase composition, Polarization, Roughness, Sodium chloride, Sulfates, Surface field, Surface morphology, Surface treatments, Zinc alloys.

Abstract

The electrochemical codeposition of zinc-nickel alloy coatings from sulfate bath has been carried out under low and high applied magnetic field. The influence of alloy structural parameters upon corrosion behavior is discussed. It has been found that the magnetically induced convection modifies the phase composition, promoting the zinc phase in spite of the γ-N₁₅Zn₂₁. Low magnetic field acts also on the morphology of the deposits by reducing the grain size and the average roughness R_a. For alloy obtained with low magnetic field superimposition, surface morphology modification has no significant effect on corrosion behavior whereas for low nickel content alloy, the modification of phase composition, induced by applied magnetic field, favours higher polarization resistance. When high magnetic field amplitude is involved, the phase composition modifications are the same that for low applied B and the morphology is not largely modified. In this case, the hydrogen reduction current dramatically decreases that leads to a large shift of the corrosion potential. It is suggested that the surface reactivity of electrodeposited alloys depends on the magnetically induced convection that is efficient during the codeposition process.

Affiliations:

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Le document en format XML

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<term>Electrochemical corrosion</term>
<term>Electrochemical properties</term>
<term>Electrodeposited coatings</term>
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<term>Convection</term>
<term>Composition phase</term>
<term>Champ faible</term>
<term>Microstructure</term>
<term>Morphologie surface</term>
<term>Grosseur grain</term>
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<term>Zinc alliage</term>
<term>Nickel alliage</term>
<term>Rugosité</term>
<term>Champ superficiel</term>
<term>Traitement surface</term>
<term>Effet composition</term>
<term>Polarisation</term>
<term>Potentiel corrosion</term>
<term>Microscopie force atomique</term>
<term>NaCl</term>
<term>Zn</term>
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<front><div type="abstract" xml:lang="en">The electrochemical codeposition of zinc-nickel alloy coatings from sulfate bath has been carried out under low and high applied magnetic field. The influence of alloy structural parameters upon corrosion behavior is discussed. It has been found that the magnetically induced convection modifies the phase composition, promoting the zinc phase in spite of the γ-N<sub>15</sub>
Zn<sub>21</sub>
. Low magnetic field acts also on the morphology of the deposits by reducing the grain size and the average roughness R<sub>a</sub>
. For alloy obtained with low magnetic field superimposition, surface morphology modification has no significant effect on corrosion behavior whereas for low nickel content alloy, the modification of phase composition, induced by applied magnetic field, favours higher polarization resistance. When high magnetic field amplitude is involved, the phase composition modifications are the same that for low applied B and the morphology is not largely modified. In this case, the hydrogen reduction current dramatically decreases that leads to a large shift of the corrosion potential. It is suggested that the surface reactivity of electrodeposited alloys depends on the magnetically induced convection that is efficient during the codeposition process.</div>
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Electrochemical corrosion behavior in NaCl medium of zinc-nickel alloys electrodeposited under applied magnetic field

Electrochemical corrosion behavior in NaCl medium of zinc-nickel alloys electrodeposited under applied magnetic field

Source :

Descripteurs français

English descriptors

Abstract

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