Study of the corrosion of gray cast iron after deposition of the molybdenum by thermal spraying

Auteurs :  S.Tlili, A.gharbi, M.Z.Touhami, T.Chouchane, A.Bendjama
Année : 2015
Domaine : Sciences des matériaux
Type : Communication
Conférence: 3rd Euro-Mediterranean Conference on Materials and Renewable Energies, EMCMR-3, Marrakech-Morocco, November 2-6, 2015.
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Mots clés : corrosion, gray cast iron, Thermal Spraying, molybdenum

Résumé : 

Protection against corrosion is one of the most frequent cases of use of the thermal spraying. The properties of the molybdenum coating as any thermally sprayed deposit is governed by the porosity and the degree of oxidation. The aim of this study was to evaluate the anti-corrosion characteristics of a gray cast iron with lamellar graphite after deposition of molybdenum by thermal spraying process. The corrosion behavior was studied in a chloride environment NaCl 32 g / l of crude projection surfaces. The results showed the effect of the new signatif microstructure after recovery by molybdenum coating. The potentiodynamic tests and electrochemical impedance spectroscopy have promoted the thermal spray flame-wire can be a way to improve the protection against corrosion in chloride environment.