The surface of carbon fiber (CF) was modified by the electrophoretic deposition of cationic chitosan (CS), which is expected to enhance the hygrothermal and mechanical properties of carbon fiber/polyamide 6 (CF/PA 6) composites. Carbon fiber in various treatment stages was characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, atomic force microscopy, and X-ray diffraction. The studies demonstrate that the chitosan-modified carbon fiber (CS-CF) increases the surface chemical activity and roughness of carbon fiber, which enhances the chemical bonding and mechanical interlocking of carbon fiber with PA 6. Compared with desized carbon fiber (D-CF), the O/C composition ratio of CS-CF increased from 20.34 % to 50.86 %, and the tensile strength and flexural strength of the CS-CF/PA 6 composites were enhanced by 50.31 % and 43.88 %, respectively. In addition, the hygrothermal properties of CS-CF/PA 6 were also improved. Fracture observation of the composite cross-sections further elucidates the mechanism of interfacial strengthening.

碳纤维（CF）的表面通过阳离子型壳聚糖（CS）的电泳沉积进行了改性，有望增强碳纤维/聚酰胺6（CF / PA 6）复合材料的湿热性能和机械性能。通过傅里叶变换红外光谱，X射线光电子能谱，扫描电子显微镜，原子力显微镜和X射线衍射对碳纤维在不同处理阶段的特性进行了表征。研究表明，壳聚糖改性碳纤维（CS-CF）提高了碳纤维的表面化学活性和粗糙度，从而增强了碳纤维与PA 6的化学键合和机械互锁。 ），CS-CF的O / C组成比从20.34％增加到50.86％，CS-CF / PA 6复合材料的拉伸强度和弯曲强度分别提高了50.31％和43.88％。另外，CS-CF / PA 6的湿热性能也得到改善。复合截面的断裂观察进一步阐明了界面强化的机理。