Carbon fiber/epoxy composites are studied in this paper. In order to decide the important factors to the performance of the composite materials, many corrosion tests were carried out by means of immersion. The test conditions were decided by the Normal (orthogonal test) Table of three factors, i.e., temperature, concentration and the test period. The results showed that the immersion caused the properties of composites to deteriorate and that the solution temperature was the most important factor among the three factors.
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