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DTIC ADA228134: Characterization of the Corrosion of a P-130X Graph... |
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by Defense Technical Information Center |
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The corrosion behavior of a P-130x graphite fiber |
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reinforced 6063 aluminum 0-90 cross plied metal matrix |
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composite was studied. Electrochemical tests were |
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performed on the composite and the monolithic matrix |
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metal in aqueous 3.5% NaCl solutions. Immersion tests |
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were performed on the composite in aqueous 3.5% NaCl |
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solutions. The effects of pH, the presence of sulfite |
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ions, and various heat treatments were investigated. The |
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electrochemical tests included studies of galvanic |
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corrosion, corrosion potential, galvanostaircase cyclic |
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polarization and polarization resistance. Immersion tests |
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showed accelerated corrosion at the exposed interfaces, |
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with preferential attack at transverse fiber layers. |
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Galvanic corrosion was large at low pH values, large |
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graphite area fractions and when the matrix was in the |
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over-aged state. The corrosion potential of the composite |
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was found to be electronegative to the monolith when the |
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Gr-Al interfaces were exposed to the electrolyte. Low pH |
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values and over- aging increased pitting susceptibility. |
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Solutionizing and quenching lowered pitting |
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susceptibility at pH 8 but increased it at pH 4. Low pH |
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values, the presence of sulfite ions and over-aging |
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increased general corrosion rates. (JES) |
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Date Published: 2018-02-27 20:02:55 |
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Identifier: DTIC_ADA228134 |
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Item Size: 41575829 |
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Language: english |
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Media Type: texts |
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# Topics |
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DTIC Archive; King, Joel D ; NAVAL PO... |
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