The influence of gun transverse speed on electrochemical behaviour of thermally sprayed Cr3C2-NiCr coatings in 0.5 M H2SO4 solution

Autor(es)

Suegama, P. H. ^[1] ; Fugivara, C. S. ; Benedetti, A. V. ; Fernández, J. ; Delgado, J. ; Guilemany, J. M.

Afiliação do(s) autor(es)

^[1] Universidade Estadual Paulista (UNESP). Campus de Araraquara. Instituto de Química. Departamento de Físico-Química - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Electrochimica Acta; v. 49, n. 4, p. 627-634, Feb. 2004.
• Área do conhecimento: Ciências Exatas e da Terra - Química
• Assunto(s): Eletroquímica Corrosão

Resumo

In the present study, different types of 75% Cr3C2-25% NiCr coatings were applied on a steel substrate by means of high velocity oxygen fuel spraying (HVOF), and studied using ac and dc electrochemical measurements in an aerated and unstirred 0.5 M H2SO4 solution. Structural characterization was determined before and after electrochemical tests. Differences between all sprayed systems are related to the gun transverse speed and number of deposited layers, which strongly affected the electrochemical characteristics of the coated steels. The coating obtained with a higher torch speed showed better resistance against corrosion. The electrochemical impedance results were analyzed using an equivalent circuit where porosity of the coatings and substrate oxidation were considered. (AU)

• Processo FAPESP: 00/01893-9 - Revestimentos de Cr3C2-NiCr obtidos por plasma de alta velocidade: caracterização eletroquímica em solução 0,5 de H2SO4
• Beneficiário: Patricia Hatsue Suegama
• Modalidade de apoio: Bolsas no Brasil - Mestrado