Abstract
Electrochemical behavior of boron carbide (B4C) in 0.5 M Na2SO4 solution was studied using potentiodynamic polarization, cyclic voltammetry, and impedance spectroscopy. Polarization diagrams revealed three anodic current peaks and a gradual increase of anodic currents with increasing applied potential. Cyclic voltammograms revealed that the three anodic current peaks appeared only during the first positive potential scan. During the subsequent potential scans, the electrode behaved like an inert electrode within a wide potential window. Impedance spectra taken at various applied potentials revealed a potential-independent electrode/electrolyte interface double layer capacitance value approximately of 10 μf/cm2, a typical value of the electrolyte double layer capacitance of concentrated electrolyte solution, indicating that boron carbide is a degenerated semiconductor. The galvanic corrosion of particulate B4C reinforced 6092-T6 Al metal matrix composite (MMC) induced by the B4C reinforcement was examined with a zero resistance ammeter (ZRA) technique and a platinization method.
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