Resumo

MONTOYA, JUAN E.; VARGAS, FABIO  e  CALDERON, JORGE A.. PROTECTIVE CAPACITY EVALUATION OF THERMAL SPRAYED Ni-SiC y Ni-Co-W COATINGS. Dyna rev.fac.nac.minas [online]. 2009, vol.76, n.160, pp.195-206. ISSN 0012-7353.

The behavior of thermal sprayed nickel, nickel-cobalt-tungsten and silicon carbide / nickel coatings as coatings to protect steel substrates against corrosion in aggressive environment was studied. In spite of the porosity exhibited by these coatings the obtained results show that they can isolate and protect the substrate against corrosive substances because the pores are not connected and then the diffusion phenomena is more difficult. The results show that the protection capacity of three-layer (nickel / nickel-cobalt-tungsten / silicon carbide - nickel)coatings is higher that those the bi-layer (nickel / nickel-cobalt-tungsten) and the protection capacity of bi-layer coating is higher that monolayer (nickel) coating.

Palavras-chave : coatings composites; corrosion; nickel; thermal spray.

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