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Electrochemical Studies On The Behaviour Of WC-Co Hardmetal As A Function Of Cobalt Content And Environmental PH

  • : Gian Pietro De Gaudenzi1, Ivan Grigioni2, Claudio Mele3, Sandra Tedeschi1, Benedetto Bozzini4
  • : 1F.I.L.M.S. S.p.A. - OMCD Group, 2Università degli Studi di Milano, 3Università del Salento, 4Università del Salento
  • : PDF Download
  • : 2017

Abstract

The design of critical components facing a steadily expanding variety of aggressive environments calls for an insightful understanding of hardmetal corrosion mechanism. To this aim, we have investigated the performance of three WC-Co grades, implementing systematic variations of binder content and carbide granulometry, in aqueous sulphate solutions with pH in the range 1-10. Our study is based on a multi-technique approach employing a suite of electrochemical methods: potentiostatic, galvanostatic, potentiodynamic and impedance spectrometry. Our results have been interpreted with a phenomenological model accounting for the impact of material and environmental parameters – the key ones resuting to be pH and binder content - on the pseudopassive behaviour controlling corrosion resistance. Since pseudopassivity crucially depends on the electronic structure of corrosion product films, we have set up a program for their systematic study based on in situ optical and photocurrent measurements: a selection of preliminary results is proposed in this paper.

 

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