【目的】针对边坡工程长期受地下水渗透与腐蚀性介质侵蚀导致的工程结构耐久性下降问题，制备一种兼具优异抗渗与耐腐蚀性的改性云母/环氧树脂复合涂层，以克服传统环氧涂层防护性能不足的缺陷。【方法】采用硅烷偶联剂 KH-550对云母粉进行表面改性，再将其掺入环氧树脂中制备改性云母涂层；通过吸水率与水蒸气阻隔性能测试表征涂层抗渗性能，利用电化学测试分析涂层耐腐蚀性，并结合附着力与水接触角测试探究 KH-550改性对涂层综合性能的影响。【结果】KH-550能有效改善云母粉在环氧树脂中的分散性；相较于未改性体系，改性云母涂层明显改善了界面结合力与表面疏水性，附着力由 7. 38 MPa提升至 8. 01 MPa，水接触角由 98. 27°增至 111. 09°；抗渗与耐腐蚀性均实现较大提升，其中水蒸气透过率由 175. 11 g/（m2·d）降至 33. 04 g/（m²·d），水蒸气渗透系数由 6. 47×10^-12 g·cm/（cm²·s·Pa）降至 1. 36×10-12 g·cm/（cm²·s·Pa）；将涂层置于 3. 5%NaCl溶液中浸泡 600 h后，其低频阻抗模值仍保持 1. 04×10¹¹ Ω·cm²相位角为 68°，展现出优异的屏蔽防护能力。【结论】KH-550改性有效促进了云母粉在环氧涂层中的均匀分界面结合，制备的改性云母涂层在显著提升物理屏蔽性能的同时增强了与金属基底的附着力，可为边坡工程等严苛环境下的防腐抗渗材料选择提供参考。

［Objective］ To mitigate the durability deterioration of slope engineering structuresinduced by prolonged groundwater seepage and corrosive medium corrosion，a modified mica/epoxycomposite coating with enhanced impermeability and corrosion resistance was developed to overcome the defect of insufficient protective performance of traditional epoxy coatings.［Methods］Mica powderwas surface-modified using the silane coupling agent KH-550 and subsequently incorporated into anepoxy resin matrix to fabricate the modified mica composite coating. The impermeability of coating wascharacterized via water absorption and water vapor barrier performance tests. The corrosion resistancewas evaluated through electrochemical measurements. Furthermore， the influence of KH-550 modification on the overall performance of coating was investigated by combining adhesion strengthtests with water contact angle measurements.［Results］KH-550 effectively improved the dispersion ofmica powder within epoxy resin. Compared with the unmodified system，the modified mica coatingsignificantly improved the interfacial bonding strength and surface hydrophobicity. The adhesion increased from 7. 38 MPa to 8. 01 MPa，and the water contact angle increased from 98. 27° to 111. 09°.Both the anti-seepage and anti-corrosion performance have been significantly enhanced. The watervapor transmission rate decreased from 175. 11 g/（m²·d） to 33.04g/（m²·d）， and the water vapor permeability coefficient decreased from 6. 47×10^-12 g·cm/（cm²·s·Pa） to 1. 36×10^-12 g·cm/（cm²·s· Pa）. After being immersed in a 3. 5% NaCl solution for 600 hours，the low-frequency impedance modulus of coating remained at 1. 04×10¹¹ Ω ·cm²，and the phase angle was 68°，demonstrating excellent shielding and protective performance.［Conclusion］ The KH-550 modification effectivelypromotes the uniform dispersion and interfacial bonding of mica powder within the epoxy coating. Theresulting modified mica coating not only significantly enhances the physical barrier performance butalso improves the adhesion to the metallic substrate，thereby providing a valuable technical referencefor the selection of anti-seepage and anti-corrosion materials in harsh environments such as slopeengineering.