Effect of nickel content in the corrosion process of TiC/Cu-Ni composites immersed in synthetic seawater
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MRS Advances © 2020 Materials Research Society DOI: 10.1557/adv.2019.492
Effect of nickel content in the corrosion process of TiC/Cu-Ni composites immersed in synthetic seawater Miguel A. Téllez-Villaseñor1, Carlos A. León Patino1*, Ricardo Galván Martínez2, Ena A. Aguilar Reyes1 1
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] 2
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
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.
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INTRODUCTION The demand for new functional materials with a better combination of properties, such as corrosion resistance, low density, wear resistance and high mechanical strength that provide high performance in their applications, has resulted in enormous research efforts aimed particularly at the development of composite and hybrid materials as an alternative to traditional engineering alloys. Metal matrix composites (MMC) are materials with high strength/weight and stiffness/density ratios that can present better fatigue resistance, lower coefficient of thermal expansion and better wear resistance than the metal matrices from which they are made [1]. Several oxides, carbides and borides are introduced as reinforcements in metals to improve their mechanical properties and wear resistance. Among them, titanium carbide (TiC) is attractive because of its good wettability with Cu-Ni alloys [2], a fundamental conditio
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