Optimización del tratamiento de fosfatado como método de protección frente a la corrosión

E. Onofre-Bustamante; A. Olvera; A. Barba; F. J. Rodríguez; M. Carboneras; M. Álvarez; M. C. García-Alonso; M. L. Escudero

doi:10.3989/revmetalm.0959

Authors

E. Onofre-Bustamante Universidad Nacional Autónoma de México, Edificio D Facultad de Química Departamento de Metalurgia - Centro Nacional de Investigaciones Metalúrgicas, CENIM, Consejo Superior de Investigaciones Científicas, CSIC
A. Olvera Universidad Nacional Autónoma de México, Edificio D Facultad de Química Departamento de Metalurgia
A. Barba Universidad Nacional Autónoma de México, Edificio de Posgrado. Centro de Ingeniería de Superficies y Acabados (CENISA)
F. J. Rodríguez Universidad Nacional Autónoma de México, Edificio D Facultad de Química Departamento de Metalurgia
M. Carboneras Centro Nacional de Investigaciones Metalúrgicas, CENIM, Consejo Superior de Investigaciones Científicas, CSIC
M. Álvarez Centro Nacional de Investigaciones Metalúrgicas, CENIM, Consejo Superior de Investigaciones Científicas, CSIC
M. C. García-Alonso Centro Nacional de Investigaciones Metalúrgicas, CENIM, Consejo Superior de Investigaciones Científicas, CSIC
M. L. Escudero Universidad Nacional Autónoma de México, Edificio de Posgrado. Centro de Ingeniería de Superficies y Acabados (CENISA)

DOI:

https://doi.org/10.3989/revmetalm.0959

Keywords:

Phosphate, Corrosion, Protection, Adhesion

Abstract

This paper evaluates the phosphate treatment as a chemical conversion treatment (CCT) free of chromium, from the basis of the study of a commercial treatment applied in phosphoric solution at different concentrations (100% and dilutions 1:2, 1:5 and 1:10). The optimum immersion time for the phosphate conversion treatment was established from the evolution over time of the open circuit potential. Protection against corrosion of the conversion layers was evaluated by polarisation resistance and electrochemical impedance measurements. The adhesion to the substrate was evaluated by pull-off tests. Results have shown that the application of an organic coating on the substrate with a previous phosphate treatment in 1:5 dilution (10 min.) increases the corrosion resistance in, at least, one order of magnitude with respect to the non phosphate-coated metal and improves the adhesion to the substrate, since the conversion layer obtained is part of the substrate and the surface generated increases the number and area of active sites.

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