目的 合成出木薯淀粉-苯乙烯-甲基丙烯酸甲酯接枝共聚物（CS-PE-MMA）及运用自组装技术形成在柠檬酸中对钢具有良好缓蚀性能的CS-PE-MMA分子膜。方法 用扫描电子显微镜（SEM）、红外光谱(IR)表征了自组装分子膜的形貌和组成；采用动电位极化曲线、电化学阻抗谱（EIS）研究缓蚀性能。结果 CS-PE-MMA在冷轧钢表面形成球斑状稳定有序而致密的分子膜。动电位极化曲线表明工作电极阴阳极反应同时被抑制，EIS谱主要呈半圆容抗弧，电荷转移电阻随CS-PE-MMA自组装温度升高，时间增大而增大，缓蚀率最高达73.04%。结论 CS-PE-MMA属于混合抑制型缓蚀剂，自组装分子膜在H3C6H5O7溶液中对冷轧钢有良好的缓蚀作用。

The work aims to synthesize starch-phenylethylene-methyl methacrylate graft copolymer (CS-PE-MMA) and prepare CS-PE-MMA molecular monolayer of good corrosion resistance to steel in citric acid by applying self-assemble technique. The morphology and composition of the self assembled molecular monolayer were characterized by scanning electronic microscope (SEM) and infrared spectroscopy (IR). The corrosion inhibition was studied by virtue of potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS). A stable, orderly and dense molecular monolayer was generated on the cold rolled steel surface by CS-PE-MMA. Polarization curves show that reactions of anode and cathode of the working electrode were inhibited, EIS spectrum mainly showed the semicircular capacitive arc, the charge transfer resistance increased with the increase of CS-PE-MMA self-assembly temperature and time, highest inhibition rate was up to 73.04%. The CS-PE-MMA is a mixed type inhibitor and self-assembled molecular monolayer has a good corrosion inhibition to cold rolled steel in H3C6H5O7 solution.