盐雾环境中玻璃纤维/不饱和聚酯复合材料腐蚀深度对弯曲性能的影响

采用中性盐雾加速老化试验模拟海洋大气环境, 对玻璃纤维/不饱和聚酯复合材料在盐雾环境中的弯曲性能进行了研究。通过玻璃纤维/不饱和聚酯复合材料经盐雾加速老化后的吸湿率、玻璃化转变温度、巴氏硬度和弯曲性能的变化, 结合金相显微镜观测得到的腐蚀深度, 研究腐蚀深度对玻璃纤维/不饱和聚酯复合材料耐久性的影响。结果表明:老化初期玻璃纤维/不饱和聚酯复合材料的吸湿率随时间增长较快, 随后增长逐渐趋于稳定。玻璃纤维/不饱和聚酯复合材料的玻璃化转变温度呈现先增加后下降的趋势, 老化180 d后玻璃化转变温度增加了2.1%;老化180 d后玻璃纤维/不饱和聚酯复合材料的巴氏硬度与老化前相比降低了17.6%, 弯曲强度损失率为10%。基于金相显微镜分析得到老化后玻璃纤维/不饱和聚酯复合材料的腐蚀深度, 建立了腐蚀深度与弯曲强度之间的关系。 

Effects of corrosion depths on flexural properties of glass fiber/unsaturated polyester composites in salt spray environment

The accelerated neutral salt spray aging test was used to simulate the marine atmospheric environment, and the flexural properties of glass fiber/unsaturated polyester composites in salt spray environment were investiga-ted.Through changes in moisture absorption rate,glass transition temperature,Barcol hardness and bending prop-erties of glass fiber/unsaturated polyester composites after salt spray acceleration aging,in addition with the corro-sion depths obtained by metallographic microscope,the effects of corrosion depth on durability of glass fiber/unsatu-rated polyester composites were studied.The results indicate that the moisture absorption of glass fiber/unsaturated polyester composites increases quickly with time in the early aging stage,and tends to be stable at last.Glass transi-tion temperature of glass fiber/unsaturated polyester composites firstly increases,then decreases.After 180 d of ag-ing time,the glass transition temperature increases by 2.1%.After 180 d of aging time,the Barcol hardness decrea-ses by 17.6% compared to the un-aged one and flexural strengths loss rate is 10%.Based on the corrosion depths obtained by metallographic microscope analysis,the relationship between the corrosion depths and flexural strength was established for glass fiber/unsaturated polyester composites.