Anodic polarization of cemented carbides of the type [(WC,M): M = Fe, Ni or Co] in sulphuric acid solution

✍ Scribed by Henryk Scholl; Bożenna Hofman; Adam Rauscher

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 615 KB
• Volume: 37
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(92)87034-w

✦ Synopsis

The electrodes prepared from the sintered tungsten carbide (WC) containing 10 vol.% of nickel or cobalt or iron, with Vickers hardness > 1200 kg mm-*, were anodically polarized in 5 x 10-r mol dm-r aqueous solution of sulphuric acid. Material from the electrodes was electrochemically studied after mechanical polishing with diamond pastes and after the anodic prepolarization in the investigated solution (30 min. +0.8 V,_). The amperostatic, quasipotentiostatic (v = 2 mV s-r) and cyclic voltammetry methods were applied with the scanning microscopy periodical observations. The relative corrosion resistance of the examined cemented carbides was established as (WC, Ni) > (WC, Co) & (WC, Fe) and properties of the surface layers are discussed. The (WC, Co) electrode, treated anodically, can be used as the electrocatalytic active material.