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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Suegama, P. H. [1] ; Fugivara, C. S. ; Benedetti, A. V. ; Fernández, J. ; Delgado, J. ; Guilemany, J. M.
Total Authors: 6
Affiliation:
[1] Universidade Estadual Paulista (UNESP). Campus de Araraquara. Instituto de Química. Departamento de Físico-Química - Brasil
Total Affiliations: 6
Document type: Journal article
Source: Electrochimica Acta; v. 49, n. 4, p. 627-634, Feb. 2004.
Field of knowledge: Physical Sciences and Mathematics - Chemistry
Abstract

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)