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Accelerated aging effects in composites used as repair for pipes in oil industry
Polymer Composites ( IF 4.8 ) Pub Date : 2021-08-27 , DOI: 10.1002/pc.26271 Mirella L. da Rocha 1 , Maraisa C. de O. Leite 1 , Evans P. da C. Ferreira 2 , José D. D. Melo 1 , Ana Paula C. Barbosa 1
Polymer Composites ( IF 4.8 ) Pub Date : 2021-08-27 , DOI: 10.1002/pc.26271 Mirella L. da Rocha 1 , Maraisa C. de O. Leite 1 , Evans P. da C. Ferreira 2 , José D. D. Melo 1 , Ana Paula C. Barbosa 1
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Composites are often employed as repair materials for steel pipelines in the oil industry. Nevertheless, it is known that polymer matrix composites age through service life due to exposure to environmental factors, leading to a decrease in the durability of these repairs. In this work, alterations in glass fiber–epoxy composites aged for 1440, 2880, and 4320 h were studied in two different aging conditions: an accelerated aging chamber (with alternate cycles of exposure to ultraviolet [UV] radiation and water condensation) and immersed in salt water. The effects of aging in the material were evaluated by Fourier-transform infrared (FTIR) spectroscopy, dynamic mechanical analysis (DMA), lap-shear tests, permeability analysis, and scanning electron microscopy (SEM) and in terms of mass variation. The results show that chemical changes, as well as alterations in mass and fiber exposure, increases in glass transition temperature and permeability, and more pronounced debonding composite/metal after lap-shear tests, as compared to unaged materials, occurred. In general, the cycles of UV and water condensation were found to be more harmful to the material than aging in salt water, for the same exposure period.
中文翻译：
石油工业管道修复用复合材料的加速老化效应
复合材料经常被用作石油工业中钢管道的修复材料。然而，众所周知，由于暴露于环境因素，聚合物基复合材料在整个使用寿命期间会老化，导致这些修复的耐久性降低。在这项工作中，在两种不同的老化条件下研究了老化 1440、2880 和 4320 小时的玻璃纤维 - 环氧树脂复合材料的变化：加速老化室（暴露于紫外线 [UV] 辐射和水冷凝的交替循环）和浸没在盐水中。通过傅里叶变换红外 (FTIR) 光谱、动态力学分析 (DMA)、搭接剪切测试、渗透性分析和扫描电子显微镜 (SEM) 以及质量变化来评估材料老化的影响。结果表明，化学变化，以及质量和纤维暴露的改变，玻璃化转变温度和渗透性的增加，以及与未老化材料相比，在搭接剪切试验后复合材料/金属的脱粘更明显。一般来说，在相同的暴露时间下，紫外线和水冷凝的循环对材料的危害比在盐水中老化要大。
更新日期：2021-08-27
中文翻译：
石油工业管道修复用复合材料的加速老化效应
复合材料经常被用作石油工业中钢管道的修复材料。然而，众所周知，由于暴露于环境因素，聚合物基复合材料在整个使用寿命期间会老化，导致这些修复的耐久性降低。在这项工作中，在两种不同的老化条件下研究了老化 1440、2880 和 4320 小时的玻璃纤维 - 环氧树脂复合材料的变化：加速老化室（暴露于紫外线 [UV] 辐射和水冷凝的交替循环）和浸没在盐水中。通过傅里叶变换红外 (FTIR) 光谱、动态力学分析 (DMA)、搭接剪切测试、渗透性分析和扫描电子显微镜 (SEM) 以及质量变化来评估材料老化的影响。结果表明，化学变化，以及质量和纤维暴露的改变，玻璃化转变温度和渗透性的增加，以及与未老化材料相比，在搭接剪切试验后复合材料/金属的脱粘更明显。一般来说，在相同的暴露时间下，紫外线和水冷凝的循环对材料的危害比在盐水中老化要大。
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