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Anodic behaviour of WC-Co type hardmetal

✍ Scribed by B. Bozzini; G. P. De Gaudenzi; A. Fanigliulo; C. Mele

Publisher
John Wiley and Sons
Year
2003
Tongue
German
Weight
670 KB
Volume
54
Category
Article
ISSN
0947-5117

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✦ Synopsis

Abstract

An understanding of the anodic behaviour of WC‐Co type hardmetals is vital for the functional behaviour of this class of materials. The anodic oxidation of WC‐13Co grade hardmetal in 0.1 M H~2~SO~4~ was investigated. This study is based on electrochemical (linear sweep voltammetry, cyclic voltammetry, impedance spectroscopy), compositional (energy dispersive spectroscopy), structural (X‐ray diffraction) and morphological (scanning electron microscopy) investigations. The potential range in which the oxidation of the Co‐alloy takes place with respect to the nobler carbide phase was defined. Within this potential interval a passivating behaviour for the binder alloy was shown. The potential threshold for WC oxidation was identified by monitoring the inception of the electrochromic loop. The anodic attack gives rise to the formation of hydrous WO~3~. The attack morphology is characterised by the alteration of the grain shape with formation of jelly‐like microscopic and flaky macroscopic structures.

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