Electrochemical behaviour of alloy CoW0·013C0·001in acidic sulphate solutions

Autor:	Benedetto Bozzini, G. P. De Gaudenzi, Claudio Mele
Rok vydání:	2005
Předmět:	Materials science Anodizing General Chemical Engineering Alloy Inorganic chemistry Energy-dispersive X-ray spectroscopy General Chemistry engineering.material Chronoamperometry Dielectric spectroscopy Corrosion engineering Mixed oxide General Materials Science Cyclic voltammetry
Zdroj:	Corrosion Engineering, Science and Technology. 40:149-157
ISSN:	1743-2782 1478-422X
DOI:	10.1179/174327805x46986
Popis:	Elucidation of the electrochemical behaviour of the CoWxCy binder alloy is a basic step in understanding the corrosion performance of hard metals of the WC–Co type. The anodic oxidation mechanism of the alloy CoW0·013C0·001 has been studied in 0·1M H2SO4 by linear sweep and cyclic voltammetry, chronoamperometry, and electrochemical impedance spectroscopy. The morphology, composition, and structure of the reaction products were studied by scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction, respectively. In this paper, the main features of the pseudopassivating behaviour are described and a simple model for the reaction kinetics is suggested. The development of corrosion layers with different inhibiting effectiveness is reported and the relationship between the features of these layers and the evolution of the surface composition is highlighted. The formation of a hydrated mixed oxide (Co3W7O24·19H2O) is revealed, which provides evidence for the complexity of the rea...
Databáze:	OpenAIRE
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