玻璃纤维/乙烯基酯树脂复合材料在硫酸溶液中的腐蚀机理研究

THE CORROSION MECHANISM RESEARCH OF GLASS FIBER REINFORCED VINYL ESTER RESIN COMPOSITES IN SULFURIC ACID SOLUTIONS

采用称重法、电感偶合等离子发射光谱(ICP)、近红外光谱(NIR)、扫描电子显微镜(SEM)研究了玻璃纤维/乙烯基酯树脂复合材料(GF/VE)在不同温度的去离子水和硫酸溶液中的质量变化率、离子析出行为、树脂基体的水解行为以及腐蚀相态,并进一步分析了腐蚀机理。结果表明,在硫酸溶液中浸泡1800h时间内,仅在高温75℃浸泡的复合材料切割边缘封边处发现界面腐蚀,其他温度下腐蚀仅仅停留在树脂基体水平,纤维/树脂间界面仍然保持良好状态。

The corrosion mechanism of glass-fiber-reinforced vinyl ester composites was investigated by immersiong composite samples in deionized water and 40wt% sulfuric acid solution at constant temperature of 35℃,45℃,55℃,65℃,and 75℃ for periods up to 1800 hours. Results were characterized through weight gain tests,inductively coupled plasma analysis（ ICP）,near infrared spectroscopy（ NIR）,and scanning electron microscopy（ SEM）. Ion-leaching behaviors show that ion leachability depends on immersion temperature,ion content of fiber,and the character of ions in the sulfuric acid solution. NIR and SEM results show that hydrolysis reaction occurs on resin matrix. The long corrosion data indicate that most of the corrosion mechanisms initiated by sulfuric acid immersion at lower temperature（ 35℃,45℃,55℃,and 65℃） for 1800 hours are merely at the resin level,and the fiber /resin matrix interface region remains in good condition. Interface corrosion was merely found at the cutting edge of composite immersed in 75℃.