Electrochemical test, weight loss and SEM morphology were used to study the corrosion behavior of graphite epoxy composite materials (GECM), electrochemical and immersion corrosion test were conducted in 3. 5% NaCl solution. The corrosion behavior of GECM coupled with the LY12CZ aluminum alloy was also observed in immersion test. The results show that open-circuit potential of GECM was more positive because the slow diffusion rate of oxygen and could reach e-quilibrium potential until about 10h immersion. A...