Characterization of calcareous deposits in artificial seawater by impedance techniques - Laboratoire Interfaces et Systèmes Electrochimiques Accéder directement au contenu
Article Dans Une Revue Electrochimica Acta Année : 2003

Characterization of calcareous deposits in artificial seawater by impedance techniques

Résumé

Calcareous deposits were formed on steel under cathodic protection conditions in artificial seawater at various potentials from −0.9 to −1.4 V/SCE. The deposition kinetics was analysed by chronoamperometry measurements and the calcareous layers were characterized by electrochemical and electrohydrodynamical impedance spectroscopies, scanning electron microscopy observations and X-ray diffraction analyses. At 20 °C, the deposits were composed of aragonite CaCO3 when formed at potentials E comprised between −0.9 and −1.1 V/SCE, of brucite Mg(OH)2 and aragonite when formed at −1.2 V/SCE, and only of brucite when formed at potentials E≤−1.3 V/SCE. However, the in situ impedance techniques demonstrated the presence of a Mg(II)-containing porous layer along with the aragonite deposit at E≥−1.1 V/SCE. In seawater enriched with Mg2+, the deposition of aragonite was almost totally inhibited, and the behavior of the film containing Mg(II) could be described.

Domaines

Chimie

Dates et versions

hal-02479501 , version 1 (14-02-2020)

Identifiants

Citer

Ch. Barchiche, Claude Deslouis, Dominique Festy, Otavio Gil, Ph. Refait, et al.. Characterization of calcareous deposits in artificial seawater by impedance techniques. Electrochimica Acta, 2003, 48 (12), pp.1645-1654. ⟨10.1016/S0013-4686(03)00075-6⟩. ⟨hal-02479501⟩
30 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More