A mechanistic approach to the electroformation of anodic layers on copper and their electroreduction in aqueous solutions containing NaHCO<sub>3</sub> and Na<sub>2</sub> CO<sub>3</sub>

The electrochemical behaviour of Cu in solutions containing Na<sub>2</sub>CO<sub>3</sub> + NaHCO<sub>3</sub> (8.8 < pH < 11 .1) has been studied using potentiodynamic and potentiostatic techniques complemented by Scanning Electron Microscopy. The initial sta...

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Detalles Bibliográficos
Autores principales:	Pérez Sánchez, M., Souto, R. M., Barrera, M., González, S., Salvarezza, Roberto Carlos, Arvia, Alejandro Jorge
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	1993
Materias:	Ciencias Exactas Química Cu corrosion Cu anodic layers Nucleation and growth processes Solution composition Cu passivation
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/118514
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

Descripción
Sumario:	The electrochemical behaviour of Cu in solutions containing Na<sub>2</sub>CO<sub>3</sub> + NaHCO<sub>3</sub> (8.8 < pH < 11 .1) has been studied using potentiodynamic and potentiostatic techniques complemented by Scanning Electron Microscopy. The initial stages of the anodic layer formation involve the electroformation of a thin inner Cu<sub>2</sub>O layer followed by the growth of a CuO/Cu(OH)<sub>2</sub>-Cu(HO)<sub>3</sub> complex outer layer. Soluble Cu(II) species were detected in the entire anodization potential range . Kinetic models devised for phase change electrochemical processes have been applied to explain the characteristics of anodic and cathodic current transients.