目的 研究壳聚糖对铝合金表面天冬氨酸-钛锆转化膜组织结构及耐蚀性能的影响。方法 在5083船用铝合金表面分别制备添加不同含量壳聚糖的天冬氨酸-钛锆转化膜，采用SEM、EDS、FT-IR、XPS等表征手段，对转化膜的组织结构以及成分进行分析。通过电化学工作站对添加不同含量壳聚糖转化膜的开路电位-时间曲线及极化曲线进行分析。结果 成功制备了添加不同含量壳聚糖的天冬氨酸-钛锆转化膜，添加壳聚糖后，转化膜的裂纹减少，并在红外光谱结果中存在较强的氢键，出现与天冬氨酸及壳聚糖相对应的特征峰。XPS结果表明，转化膜中的Zr以ZrO2及Zr的有机络合物形式存在，转化膜中的Ti以TiO2形式存在，同时也存在天冬氨酸自身结构以及壳聚糖自身结构的峰位。腐蚀电流密度由未添加壳聚糖时的3.966×10-6 A/cm2降低至3.274×10-7A/cm2，耐蚀性具有明显提升。结论 添加壳聚糖能够与传统天冬氨酸-钛锆转化膜结合形成络合物转化膜。适量添加壳聚糖能够改善钛锆转化膜的裂纹情况及耐蚀性，当壳聚糖添加量为15 mL/L时，膜层裂纹最少，同时转化膜的耐蚀性最优。

The work aims to study the effect of chitosan on microstructure and corrosion resistance of aspartic ac-id-Ti-Zr-based conversion coating on aluminum alloy surface. Aspartic Acid-Ti-Zr-based conversion coating with different contents of chitosan was prepared on the surface of the 5083 marine aluminum alloys. The microstructure and composition of the conversion coating were analyzed by SEM, EDS, FT-IR and XPS. Open-circuit potential-time curves and polarization curves of conversion coatings with different contents of chitosan were analyzed by electrochemical work station. The aspartic ac-id-zirconium-titanium conversion coatings with different contents of chitosan were successfully prepared. The crack of conversion coating was reduced after the addition of chitosan. There were strong hydrogen bonds in the infrared spectrum results, and characteristic peaks corresponding to aspartic acid and chitosan appeared. XPS results showed that Zr in the conversion coating existed as an organic complex of ZrO2 and Zr. Ti in the conversion coating existed in the form of TiO2, and the structure of aspartic acid and the peak position of chitosan existed. The corrosion current density was reduced from 3.966×10-6 A/cm2 to 3.274×10-7 A/cm2. The corrosion resistance was significantly improved. Chitosan can be added to conventional Aspartic Acid-Ti-Zr-based conversion coating to form a complex conversion coating. The appropriate addition of chitosan can improve the cracking and corrosion resistance of the Zr-Ti-based conversion coating. When the amount of chitosan is 15 mL/L, the crack of the conversion coating is the least, and the corrosion resistance of the conversion coating is optimal.