Epoxy resins reinforced by basalt fibers were treated with a sulfuric acid solution for different periods and concentrations. The tensile strength of the composites was examined after the treatment. The fracture surfaces were characterized using scanning electron microscopy and energy-dispersive X-ray spectroscopy. The tensile strengths of the sulfuric acid solution-treated samples showed a decreasing trend with treating times and concentrations. However, after 250–500 h of treatment time, the tensile strengths showed an increasing trend. Based on the experimental results, the possible corrosion mechanisms were explored. Sulfuric acid leads to insoluble sulfur oxide formation with high C, Ca and Fe element contents on the fiber surface. With the continuation of sulfuric acid reaction, a thin corrosion shell covers the whole fiber surface. The thickest corrosion shell caused a significant increase in the tensile strength at the breaking of basalt fibers.

中文翻译：

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玄武岩纤维增强复合材料在硫酸溶液中的腐蚀机理及降解行为

玄武岩纤维增强环氧树脂用硫酸溶液处理不同时间和浓度。处理后检测复合材料的拉伸强度。使用扫描电子显微镜和能量色散 X 射线光谱仪对断口表面进行了表征。硫酸溶液处理样品的拉伸强度随着处理时间和浓度的增加呈下降趋势。然而，在处理时间为 250-500 小时后，抗​​拉强度呈增加趋势。根据实验结果，探讨了可能的腐蚀机理。硫酸导致在纤维表面形成具有高 C、Ca 和 Fe 元素含量的不溶性硫氧化物。随着硫酸反应的继续，一层薄薄的腐蚀壳覆盖了整个纤维表面。