Abstract
Galvanic corrosion of a 6092-T6 Al metal-matrix composite (MMC) reinforced with boron carbide (B4C) particulates was examined through electrochemical characterization of the MMC as well as a monolithic B4C. The results were interpreted based on a recently proposed electronic model for B4C that emphasizes a conventional non-degenerate p-type semiconductor band structure with high density of gap states. A combination of scanning vibration electrode technique and scanning ion-selective electrode technique revealed that localized anodic and cathodic sites of over 200 μm in diameter co-existed on the surface of the MMC during immersion of the MMC in an air-exposed 3.15 wt% NaCl solution.
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