Corrosion Behavior of a P130x Graphite Fiber Reinforced 6063 Aluminum Composite Laminate in Aqueous Environments

Abstract

The aqueous corrosion behavior of 0/90 cross-plied P130x graphite fiber reinforced 6063 A1 composite laminates was studied in deaerated and aerated aqueous Na2SO4 and NaC1 solutions using immersion and electrochemical techniques. Special emphasis was given to the identification of the principal mechanism(s) of corrosion. It was demonstrated conclusively via microscopic and electrochemical considerations that galvanic attack of the matrix was by far the dominant mechanism of corrosion in both solutions when A1 and graphite are simultaneously exposed. Localized attack of microstructural segregations, if operative, was negligible compared to galvanic corrosion. When graphite is not exposed to the electrolyte, pitting of the surface foil, followed by galvanic attack of the matrix once the pit penetrates to the underlying graphite fibers, was found to be the primary corrosion mechanism. The effects of matrix heat-treatment, solution pH, sulrite ion contamination, and solution aeration on the electrochemical parameters and the overall corrosion behavior in 3.5% NaCI solutions were also studied. In general, the susceptibilities of general, galvanic, and localized corrosion were found to increase at lower pH levels and in the presence of su]fite ion contamination. Progressive aging of the matrix decreased corrosion susceptibility in deaerated solutions, but seemed to increase it in aerated solutions. The impact of each of the above parameters on the electrochemical nature of the various operative corrosion processes has been discussed in detail.) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 130.56.64.29 Downloaded on 2015-03-16 to IP

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