炭纤维环氧复合材料腐蚀行为的研究

采用电化学测试、腐蚀失重测量和SEM表面微观分析等试验方法,研究了炭纤维环氧复合材料浸泡在腐蚀介质中,由于腐蚀介质的存在和作用,对炭纤维环氧复合材料腐蚀行为的影响;同时对偶接了LY12CZ铝合金的炭纤维环氧复合材料也进行了腐蚀浸泡对比试验.结果表明,炭纤维环氧复合材料在3.5%NaCl腐蚀介质中,由于氧扩散的作用,开路电位需要近10h才能达到平衡,其腐蚀电位较正,树脂及树脂与纤维界面对腐蚀介质的吸湿,导致复合材料本身腐蚀增重.浸泡1464h后炭纤维环氧复合材料的表面微观形貌变化不大;在同样的浸泡条件下,偶接了LY12CZ铝合金对炭纤维环氧复合材料的腐蚀行为基本没有影响.

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 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. Absorption of corrosion media made the weight gain of GECM. The surface morphology of GECM did not changed greatly after 1464h immersion corrosion. The corrosion behavior of GECM was not affected basically by galvanic corrosion between LY12CZ aluminum alloy and GECM.