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Titolo:
Investigation of electrochemical calcareous scaling - Nuclei counting and morphology
Autore:
Beaunier, L; Gabrielli, C; Poindessous, G; Maurin, G; Rosset, R;
Indirizzi:
Univ Paris 06, CNRS, UPR 15, F-75252 Paris 05, France Univ Paris 06 Paris France 05 06, CNRS, UPR 15, F-75252 Paris 05, France Ecole Super Phys & Chim Ind, Lab Chim Analyt Proc Ind, URA CNRS 437, F-75231 Paris, France Ecole Super Phys & Chim Ind Paris France F-75231 , F-75231 Paris, France
Titolo Testata:
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
fascicolo: 1-2, volume: 501, anno: 2001,
pagine: 41 - 53
Fonte:
ISI
Lingua:
ENG
Soggetto:
CATHODICALLY PROTECTED STEEL; IMPINGING JET CELL; CALCIUM-CARBONATE; GROWTH; VATERITE; DEPOSITS; SPECTROSCOPY; SEAWATER; SYSTEM; CACO3;
Keywords:
nucleation/growth process; diffusion-controlled process; calcareous scale; nuclei counting; electrochemical scaling;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
41
Recensione:
Indirizzi per estratti:
Indirizzo: Gabrielli, C Univ Paris 06, CNRS, UPR 15, 4 Pl Jussieu,Tour 22, F-75252 Paris 05, France Univ Paris 06 4 Pl Jussieu,Tour 22 Paris France 05 5, France
Citazione:
L. Beaunier et al., "Investigation of electrochemical calcareous scaling - Nuclei counting and morphology", J ELEC CHEM, 501(1-2), 2001, pp. 41-53

Abstract

The nucleation/growth process of electrochemically deposited calcium carbonate was investigated by means of image analysis from SEM observations. First, a model based on a diffusion-controlled process, where the area of the nuclei increases proportionally with time, is proposed. An estimation of the geometric quantities, which can be evaluated by statistical counting and image analysis, is given. Namely, the number of nuclei and the area coveredby the nuclei are evaluated. Limiting values for instantaneous and progressive nucleation is given. The comparison of these quantities with experimental data allows the number of active sites, the nucleation rate and the rate constant of the nucleus size to be estimated. Various experimental conditions, which control the nucleation/growth rate were investigated: surface pretreatment of the electrode surface, concentration of the dissolved oxygen, concentration in calcium carbonate, and electrolyte flow rate. For each set of experimental conditions, the morphology of the deposited scale was observed. A neat correlation between the crystal habit and the nucleation rate is demonstrated. (C) 2001 Elsevier Science B.V. Ah rights reserved.

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Documento generato il 26/09/20 alle ore 05:27:11