STP864: Assessing the Corrosion Resistance of Metal Matrix Composite Materials in Marine Environments

    Aylor, DM
    Materials engineer, David W. Taylor Naval Ship Research and Development Center, Bethesda, MD

    Kain, RM
    Corrosion scientist, LaQue Center for Corrosion Technology, Inc., Wrightsville Beach, NC

    Pages: 16    Published: Jan 1985


    Abstract

    The corrosion resistance of graphite/aluminum (Gr/Al) and silicon carbon/aluminum (SiC/Al) metal matrix composite (MMC) materials and composite corrosion protection methods were investigated in marine environmental exposures ranging from 30 to 365 days. Accelerated corrosion of the Gr/Al resulted from galvanic interactions between the graphite fibers and the aluminum matrix. Corrosion of the SiC/Al was due to pitting, which was oriented at the silicon carbide-aluminum interfaces in the discontinuous forms of silicon carbide reinforcement. Differences in surface foil alloy and composite structure for the Gr/Al or type of silicon carbide reinforcement for the SiC/Al did not affect the materials' overall corrosion resistance. A variety of corrosion control coatings was found to be suitable for protection of the MMC, including organic and thermal-sprayed coatings.

    Keywords:

    metal matrix composites, graphite/alumium, silicon carbide/aluminum, aluminum, coatings, marine corrosion


    Paper ID: STP32817S

    Committee/Subcommittee: D30.07

    DOI: 10.1520/STP32817S


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