Study on the corrosion behavior of graphite epoxy composite materials

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 showed that open-circuit potential of GECM was more positive because the slow diffusion rate of oxygen and could reach equilibrium potential until about 10 h immersion. Absorption of corrosion media made the weight gain of GECM. The surface morphology of GECM did not change greatly after 1464 h immersion corrosion. The corrosion behavior of GECM was not affected basically by galvanic corrosion between LY12CZ aluminum alloy and GECM.