Abstract: Some major elements influencing the modification effect of mesophase pitch-based carbon fiber during the process of electrochemical oxidation are comparatively analysed by the orthogonal experiment. The optimized conditions for the electrochemical oxidation are characterized through Fourier transform infrared spectroscopy，X-ray photoelectron spectroscopy etc. An obvious improvement in the interlaminar shear strength (ILSS) is achieved when the composite is prepared from the mesophase pitch-based carbon fiber being treated with HNO3（65%）and electrochemical oxidation. With the optimized conditions，the ILSS of the composite can amount to 45.324MPa，which is 24.1% higher than the process including electrochemical oxidation only and 49.4% higher than that with the carbon fiber without any modification.

摘要： 利用正交法研究了电化学氧化法对中间相沥青基碳纤维表面处理过程中各因素对表面处理效果的影响，获得了优化的表面处理条件。利用傅里叶变换红外光谱扫描、X射线光电子能谱分析等手段，对优化的最佳条件下的表面处理效果进行表征。实验结果表明：采用浓硝酸预处理后，再进行电化学氧化表面处理可使碳纤维复合材料的层间剪切强度（ILSS）进一步提高，可达45.324 MPa，较未经硝酸预处理而直接进行电化学氧化表面处理的碳纤维提高了24.1%，较未表面处理碳纤维提高了49.4%