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Electrochemical Evaluation of a Discontinuously Reinforced TiC/Ni-20Cr Composite

Published online by Cambridge University Press:  28 January 2020

Rocio J. Gonzalez-Esquivel ,
Carlos A. Leon-Patiño Open the ORCID record for Carlos A. Leon-Patiño [Opens in a new window] ,
Ricardo Galvan-Martinez  and
Ena A. Aguilar-Reyes
Rocio J. Gonzalez-Esquivel
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., Méxic.
Carlos A. Leon-Patiño*
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., Méxic.
Ricardo Galvan-Martinez
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., Méxic.
*
*(Email: caleon@umich.mx)
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Abstract

The work focuses on the analysis of electrochemical corrosion in synthetic salt medium of the TiC/Ni-20Cr composite through the polarization curve technique at four exposure times (0, 6, 12 and 24 h). The composite was prepared by liquid infiltration of the liquid alloy into a porous body of TiC. It was found a continuous and homogeneous distribution of the reinforcing material in the interconnected matrix, having a residual porosity of 6.49 vol.%. According to the electrochemical results, in both samples the highest corrosion rate (CR) was obtained at 12 h exposure due to the rupture of the film of the corrosion products, allowing the interaction of chloride ions with the metal surface. The CR of the composite was slightly higher than that of the alloy at all exposure times, so that the presence of the reinforcing particles and the residual porosity reduce the corrosion resistance of the matrix in the composite. The mechanism of corrosion observed in the alloy and the composite was by pitting, however, the composite also presents crevice corrosion by a differential aeration cell mechanism formed between the metal matrix and the ceramic reinforcement, affected by the residual porosity as confirmed by electron microscopy examination.

Keywords

compositeNiCrcorrosion
Type
Articles
Information
MRS Advances , Volume 4 , Issue 63: International Materials Research Congress XXVIII , 2019 , pp. 3495 - 3503
Copyright
Copyright © Materials Research Society 2020 

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