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Effect of nickel content in the corrosion process of TiC/Cu-Ni composites immersed in synthetic seawater

Published online by Cambridge University Press:  03 January 2020

Miguel A. Téllez-Villaseñor ,
Carlos A. León Patino Open the ORCID record for Carlos A. León Patino [Opens in a new window] ,
Ricardo Galván Martínez  and
Ena A. Aguilar Reyes
Miguel A. Téllez-Villaseñor
Affiliation:
Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo, Av. Francisco J. Mujica S/N Ciudad Universitaria, Morelia 58030, Mich., México
Carlos A. León Patino*
Affiliation:
Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo, Av. Francisco J. Mujica S/N Ciudad Universitaria, Morelia 58030, Mich., México
Ricardo Galván Martínez
Affiliation:
Unidad Anticorrosión, Instituto de Ingeniería, Universidad Veracruzana Av. S.S. Juan Pablo II. S/N, Zona Universitaria, Fracc. Costa Verde. CP. 94294, Veracruz, Veracruz, México
Ena A. Aguilar Reyes
Affiliation:
Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo, Av. Francisco J. Mujica S/N Ciudad Universitaria, Morelia 58030, Mich., México
*
*[email protected]
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Abstract

The work presents an electrochemical study of the corrosion behaviour of two TiC/Cu-Ni metal matrix composites with a content of 10 and 20 wt.% Ni immersed in synthetic seawater. The composites were synthesized by a capillary infiltration technique, obtaining dense materials TiC/Cu-10Ni and TiC/Cu-20 Ni with a residual porosity of 1.8 and 1.7%, respectively. The corrosion rate (CR) was evaluated from the techniques of polarization curves (PC), linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS). Electrochemical measurements were carried out under static conditions, ambient temperature and atmospheric pressure at 24 hours exposure in the electrolytic medium. The corrosion rate is affected by the Ni content in the matrix, with less corrosion in the composite with a higher Ni content. The higher content of Ni in the Cu-Ni alloy provides higher passivation and stability to the corrosion products film that are absorbed on the composite surface. Microscopic examination (SEM) showed a characteristic morphology of a corrosion mechanism of the localized type (pits and crevices) generated by a differential aeration, where the TiC/Cu-10Ni composite showed greater degradation.

Keywords

corrosioncompositeCuNi
Type
Articles
Information
MRS Advances , Volume 4 , Issue 63: International Materials Research Congress XXVIII , 2019 , pp. 3475 - 3484
Copyright
Copyright © Materials Research Society 2020 

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