NickelMaghrebV1, France, Analysis, bibRecord, 000472

Electrochemical investigation of Ni-P autocatalytic deposition in ammoniacal solutions

Identifieur interne : 000472 ( France/Analysis ); précédent : 000471; suivant : 000473

Electrochemical investigation of Ni-P autocatalytic deposition in ammoniacal solutions

Auteurs : M. Ebn Touhami [Maroc] ; M. Cherkaoui [Maroc] ; A. Srhiri [Maroc] ; A. Ben Bachir [Maroc] ; E. Chassaing [France]

Source :

Journal of applied electrochemistry [ 0021-891X ] ; 1996.

RBID : Pascal:96-0285211

Descripteurs français

Pascal (Inist)
- Etude expérimentale, Dépôt électrolytique, Réaction électrochimique, Autocatalyse, Mécanisme réaction, Electrode, Carbone, Etat vitreux, Nickel, Acier doux, Ammoniac, Nickel Sulfate, Sodium Hypophosphite, Condition opératoire, Impédance électrique, Nickel Alliage, Phosphore Alliage, Alliage binaire.
Wicri :
- topic : Carbone, Nickel.

English descriptors

KwdEn :
- Ammonia, Autocatalysis, Binary alloy, Carbon, Electrical impedance, Electrochemical reaction, Electrodes, Electroplating, Experimental study, Glassy state, Mild steel, Nickel, Nickel Alloys, Nickel Sulfates, Operating conditions, Phosphorus Alloys, Reaction mechanism, Sodium Hypophosphites.

Abstract

The kinetics of Ni-P autocatalytic deposition in ammoniacal solutions was investigated by means of cyclic voltammetry and electrochemical impedance spectroscopy. The effect of the solution constituents (hypophosphite, nickel salt and pH) was examined. Strong interactions between the cathodic and anodic processes occur. The metal discharge is enhanced by the oxidation of hypophosphite, which is the predominant reaction in this process. The nickel deposition also affects the anodic process. With increasing pH the nickel discharge is progressively inhibited due to the change in the nature of the Ni(II) complexes. In contrast, in the presence of Ni(II) species, due to the opposite effect of the two partial processes, the plating rate increases for pH values up to 9 and then decreases for higher pH values.

Affiliations:

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Pascal:96-0285211

Le document en format XML

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<front><div type="abstract" xml:lang="en">The kinetics of Ni-P autocatalytic deposition in ammoniacal solutions was investigated by means of cyclic voltammetry and electrochemical impedance spectroscopy. The effect of the solution constituents (hypophosphite, nickel salt and pH) was examined. Strong interactions between the cathodic and anodic processes occur. The metal discharge is enhanced by the oxidation of hypophosphite, which is the predominant reaction in this process. The nickel deposition also affects the anodic process. With increasing pH the nickel discharge is progressively inhibited due to the change in the nature of the Ni(II) complexes. In contrast, in the presence of Ni(II) species, due to the opposite effect of the two partial processes, the plating rate increases for pH values up to 9 and then decreases for higher pH values.</div>
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Electrochemical investigation of Ni-P autocatalytic deposition in ammoniacal solutions

Electrochemical investigation of Ni-P autocatalytic deposition in ammoniacal solutions

Source :

Descripteurs français

English descriptors

Abstract

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Le document en format XML

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