Corrosion Behavior of a Graphite Fiber/Magnesium Metal Matrix Composite in Aqueous Chloride Solution
1986; Volume: 42; Issue: 10 Linguagem: Inglês
10.5006/1.3583031
ISSN1938-159X
Autores Tópico(s)Fiber-reinforced polymer composites
ResumoAbstract The corrosion behavior of a graphite fiber/magnesium composite has been studied in dilute chloride solutions by immersion, scanning electron microscopy (SEM), and electrochemical techniques. The composite consisted of graphite fibers coated with magnesium Alloy AZ91C hot pressed between thin foils of Alloy AZ31B. Within five days of immersion in 0.001 N NaCl, severe localized corrosion developed at the edges of the material where exposed graphite fibers existed. The reaction was accompanied by visible hydrogen evolution over the entire surface, and the attack was through the foil covering into the underlying matrix material. Electrochemical measurements in chloride solution of borated boric acid (pH 8.4, 1000 ppm Cl−) revealed significant galvanic currents between the magnesium foil and graphite fibers. These currents increased as the surface area ratio of graphite to magnesium increased. From this work, it is concluded that galvanic interaction plays an important role in the aqueous corrosion of...
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