Abstract

A research program was conducted to assess the corrosion behavior of copper-based metal-matrix composites. Two categories of composites were studied: commercially available composites and developmental composites. While the anodic polarization curves for the monolithic and composite materials were quite similar, the corrosion behavior varied. The commercially available material was dispersion-strengthened copper, which was found to possess corrosion resistance comparable to that of pure copper. This was due largely to the stability of the protective film in the presence of finely distributed Al2O3 particles. The developmental composites were reinforced with graphite in either particulate or fiber form. Graphite content and the presence of dissolved oxygen affected corrosion severity, and all of the developmental composites exhibited uniform corrosion and some localized galvanic corrosion at the reinforcement-copper interface during polarization. Other types of corrosion damage were also observed in the noncommercial materials.

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