酸碱腐蚀对聚酰亚胺/碳纤维复合材料摩擦磨损性能的影响

Effects of Friction and Wear Properties of Acid and Alkali Corrosion on the Polyimide/Carbon Fiber Composites

通过傅里叶红外光谱仪(ATR)、环境扫描电镜(SEM)、摩擦磨损试验机,对聚酰亚胺/碳纤维复合材料在质量分数为10%的HCl和NaOH溶液中腐蚀不同时间后的红外光谱及摩擦磨损性能进行实验研究。结果表明:材料的耐酸性明显优于耐碱性;酸碱处理后材料表面的基团结构发生了相应变化;HCl溶液和NaOH溶液腐蚀环境对材料摩擦因数的影响程度基本相同,处理后摩擦因数都降低,酸蚀环境对材料磨损率的影响不大,而碱蚀环境影响较大;腐蚀环境对材料的裂纹扩展有较明显的加速作用,酸碱处理后材料的磨损机制主要是磨粒磨损和疲劳磨损的综合作用。

Tribological performances and the infrared spectra of thermoplastic polyimide/carbon fiber composites which were treated at different times with 10% （mass fraction）hydrochloric acid and sodium hydroxide solution were investigated by Fourier transform infrared spectroscopy（ATR）, environmental scanning electron microscopy（ SEM ）, friction and wear tester. The results show that the resistance to acid of the composites is better than that to alkaline. The group structure of material surface is changed correspondingly after treated by acid or alkali. The influence of different environments of HC1 solution and NaOH solution on the friction coefficient of material is almost the same, the friction coefficient of the compos- ites is lowered after treated by acid or alkali. The acid treatment has little influence on the wear rate of the composites, while alkali treatment has a greater impact on the wear rate. The corrosive environment accelerates strongly crack growth of the composites. After acid and alkali treatment, the wear mechanism is the synthetic action of abrasive wear and fatigue fracture.