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        Characterization of the corrosion of a P-130x graphite fiber reinforced 6063 aluminum metal matrix composite.

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        Author
        King, Joel David
        Date
        1989-12
        Advisor
        Dutta, Indranath
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        Abstract
        The corrosion behavior of a P-130x graphite fiber reinforced 6063 aluminum 0-90 cross plied metal matrix composite was studied. Electrochemical tests were performed on the composite and the monolithic matrix metal in aqueous 3.5% NaCl solutions. Immersion tests were performed on the composite in aqueous 3.5% NaCl solutions. The effects of pH, the presence of sulfite ions, and various heat treatments were investigated. The electrochemical tests included studies of galvanic corrosion, corrosion potential, galvanostaircase cyclic polarization and polarization resistance. Immersion tests showed accelerated corrosion at the exposed interfaces, with preferential attack at transverse fiber layers. Galvanic corrosion was large at low pH values, large graphite area fractions and when the matrix was in the over-aged state. The corrosion potential of the composite was found to be electronegative to the monolith when the Gr-Al interfaces were exposed to the electrolyte. Low pH values and over-aging increased pitting susceptibility. Solutionizing and quenching lowered pitting susceptibility at pH 8 but increased it at pH 4. Low pH values, the presence of sulfite ions and over- aging increased general corrosion rates.
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        This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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        http://hdl.handle.net/10945/25734
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        • 1. Thesis and Dissertation Collection, all items

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          Corrosion mechanisms and behavior of a P-130x Gr/6063 A1 composite in aqueous environments 

          Elkin, Leslie R. (Monterey, California: Naval Postgraduate School, 1990);
          The corrosion mechanisms and behavior of a P-130x graphite fiber reinforced 6063 aluminum composite laminate were studied. Electrochemical and total immersion tests were performed on the composite in 3.5% sodium chloride ...
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          Sodium sulfate hot corrosion of silicon carbide fiber-reinforced calcium aluminosilicate 

          Oppici, Maria A. (Monterey, California. Naval Postgraduate School, 1995-03);
          The effects of sodium sulfate hot corrosion on the microstructure of silicon carbide fiber-reinforced calcium aluminosilicate glass-ceramic matrix composite were investigated using optical microscopy, scanning electron ...
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          Sodium sulfate corrosion of silicon carbide fiber-reinforced lithium aluminosilicate glass-ceramic matrix composites 

          Maldia, Leopoldo C. (Monterey, California. Naval Postgraduate School, 1993-12);
          Sodium sulfate hot corrosion of a SiC fiber-reinforced lithium aluminosilicate (LAS) glass-ceramic matrix composite was studied using Scanning Electron Microscope (SEM) and X-ray Diffraction (XRD). Changes in the microstructural ...
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