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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180d后玻璃化转变温度增加了2.1%;老化180d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。
The neutral atmospheric salt fog accelerated 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 studied. Through the glass fiber / unsaturated polyester composite after salt spray accelerated aging moisture absorption rate, glass transition temperature, Barcol hardness and bending properties of changes, combined with the microscope to observe the corrosion depth, the corrosion depth of glass fiber / Unsaturated polyester composite durability effects. The results showed that the moisture absorption rate of glass fiber / unsaturated polyester composites increased rapidly with the passage of time and then gradually stabilized. The glass transition temperature of glass fiber / unsaturated polyester composites initially increased and then decreased, and the glass transition temperature increased by 2.1% after 180 days. The Barcol hardness of glass fiber / unsaturated polyester composites after 180 days aging 17.6% lower than before aging and 10% loss of flexural strength. Based on the analysis of metallographic microscope, the corrosion depth of glass fiber / unsaturated polyester composites after aging was established, and the relationship between corrosion depth and bending strength was established.