玻璃钢复合材料耐海水腐蚀性能及抗Cl^-渗透寿命预测

Seawater Corrosion Resistance and Service Life Prediction of Glass Fiber Reinforced Plastic Composites

采用70℃、3.5%(质量分数)的海盐溶液对不饱和聚酯玻璃钢及环氧乙烯基酯玻璃钢进行加速老化实验,研究了玻璃钢的耐海水腐蚀性能,并对2 mm厚的玻璃钢防护层的抗Cl^-渗透寿命进行了预测。结果表明:不饱和聚酯玻璃钢在海水中容易发生水解腐蚀,其抗Cl^-渗透寿命约为30 a;而环氧乙烯基酯玻璃钢的抗Cl^-渗透寿命约为70 a,具有更好的耐海水腐蚀性能。

The anti-corrosion performance of glass fiber reinforced plastic （GFRP） composites was evaluated by immersion test in 3.5% （mass fraction） sea salt solutions at 70℃ in terms of the de- creasing trend of the pH value of the solution, the mass variation rate, and the bending strength re- tention rate of GFRP composites with time. While the surface morphology of the fractured surface of the composites, especially the glass fiber/resin interface before and after corrosion was exam- ined by SEM. The concrete sample wrapped with GFRP composites was used to examine the time when C1- penetrated through the GFRP layer. And, the life of resistance to Cl- penetration of 2 mm thick GFRP composites was predicted. Results showed that the life of resistance to Cl- penetration for the unsaturated ester based GFRP composite was about 30 a; while the epoxy vinyl ester based GFRP composite was about 70 a.