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Article Dans Une Revue Surface and Coatings Technology Année : 2005

Electrochemical characterization of plasma sprayed WC–Co coatings by impedance techniques

Résumé

The porosity of plasma sprayed coatings (which were either conductive when Co was incorporated in a WC matrix or insulating with Al2O3) was tested by impedance techniques in a NaCl aqueous medium. Models of active pores (conductive coating) based on transmission lines or inactive pores (insulating coating) based on lumped parameter circuits were proposed. A good agreement was found between the impedance predicted by the models and the impedances measured in a wide frequency range on both conductive and insulating coatings. In particular, the coatings can be compared on the basis of their porosity. For WC–Co coatings, it was found that the porosity decreases when the Co content increases.

Domaines

Chimie

Dates et versions

hal-04175275 , version 1 (02-08-2023)

Identifiants

Citer

R. Saenger, D. Martin, Claude Gabrielli. Electrochemical characterization of plasma sprayed WC–Co coatings by impedance techniques. Surface and Coatings Technology, 2005, 194 (2-3), pp.335-343. ⟨10.1016/j.surfcoat.2004.08.187⟩. ⟨hal-04175275⟩
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