Characterization of TiC/Ni Composite Immersed in Synthetic Seawater
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MRS Advances © 2017 Materials Research Society DOI: 10.1557/adv.2017.562
Characterization of TiC/Ni Composite Immersed in Synthetic Seawater J. M. Durán-Olvera1, R. Orozco-Cruz1, R. Galván-Martínez1*, C.A. León2, A. Contreras3 1
Unidad Anticorrosión, Instituto de Ingeniería, Universidad Veracruzana, Veracruz, México. 2
Instituto de Investigación en Metalurgia y Materiales, de la UMSNH, Morelia, Mich. México.
3
Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas Norte 152, Col. San Bartolo Atepehuacan, C.P. 07730, México. * Contacting author email: [email protected]
ABSTRACT This work shows the electrochemical study of nickel (Ni) and TiC/Ni composite immersed in synthetic seawater. In order to characterize the corrosion process, polarization curves (PC) were carried out. All electrochemical measures were made under static conditions, room temperature, atmospheric pressure and 24 hours exposure time. An electrochemical cell with a typical three-electrode array was used. Effect of TiC as reinforcement into the Ni matrix was evaluated. According PC results, it is possible to point out that the corrosion rate (CR) of the TiC/Ni composite was higher than Ni corrosion rate. The obtained results indicate that the corrosion process of both materials is of mixed type, that is to say a process of transfer of load influenced by a mechanism of mass transfer. Observations through scanning electron microscopy (SEM) revealed that mechanism of corrosion was cells of differential aeration (difference of concentration of oxygen). The corrosion morphology was localized type (pits and crevice). INTRODUCTION The manufacture of new materials with superior features to the traditional metals and alloys have been the main trigger to development of composites materials with metallic matrix. The composite are multifunctional materials with high mechanical and physical properties, where these properties can be adapted to satisfy a particular application [1]. Although there are many metal matrix composites (MMC) fabrication methods like powder metallurgy [2], squeeze casting [3], stir casting [4], thermal spray [5], vortex method [6] and infiltration [1, 7-9]; the infiltration process is one of the most widely used method. The infiltration process of a ceramic preform without external pressure has some advantages for the fabrication of composites such as isotropic properties, which in turn will be reflected in the mechanical properties and corrosion resistance. During the infiltration process, the wettability of metal (in this case Ni) on the reinforcement (TiC) plays an important role because this phenomenon defines the strength of the matrix-reinforcement interface [10-13]. Poor wetting create sites with weak interfaces that can be sites for initiation of crevice corrosion.
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