Numéro : 2067 - Year : 1988

Corrosion behaviour of carbides coatings for wear parts immerged in sea water

J.M. CORRIEU, Laboratoire de corrosion à l'Ecole Nationale Supérieure de Chimie de Paris ( ENSCP).
D.GEORGEAULT, Section Matériaux et Structures Navals au Service Technique des Constructions et Armes Navales (STCAN).

A study of electrochemical corrosion characteristics in artificial sea water was made with carbides coatings (Cr3C2 -Ni -Cr, WC -Co) applied by plasma (APS, VPS) or Jet -Kote spraying.

Corrosion behavior of coatings depends on the metallic binder passivity. Deposition techniques used occur as a function of structural modifications induced in the powders.

These tests were fol1owed by a study of galvanic corrosion of coatings coupled to different materials (copper alloys, stainless steel, nickel or cobalt base alloys, carbon -epoxy composite).

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