目的 验证SiO2涂层对PEI绝缘材料耐原子氧剥蚀能力的提升效果。方法 以某航天器舱外用电连接器PEI绝缘材料为研究对象，将全氢聚硅氮烷(PHPS)作为涂层材料，利用底涂浸涂、面涂喷涂的KH-AORX湿化学法镀膜工艺，把PHPS直接转化为二氧化硅(SiO2)无机防护涂层。基于型号在轨15年的工作寿命要求，开展5年原子氧总通量为2.61×10²⁶ atoms/m²、原子氧通量率为6.5×10¹⁵ atoms/(cm².s)的试验验证，分析试验前后的材料质量损失率、原子氧剥蚀率和外观形貌的变化。结果 采用的KH-AORX湿化学法镀膜工艺可实现将PHPS涂层材料作用于PEI绝缘材料并直接转换为SiO2保护涂层。涂层边缘厚度及中心厚度具有较好的一致性，涂层硬度及附着力满足设计指标要求。已涂覆SiO2的PEI绝缘体经历5年通量的原子氧剥蚀后，质量损失率为0.05%，拟合计算后，经历15年通量的原子氧剥蚀后的质量损失率为0.29%。经电子显微镜检查，PEI绝缘体表面SiO2涂层未见起层、脱落和基体暴露现象。结论 利用KH-AORX湿法镀膜工艺在PEI绝缘材料上将PHPS转化为SiO2涂层，能够获得较大的膜层，且膜层厚度分布均匀。SiO2涂层能有效提高PEI绝缘材料的耐原子氧性能，满足舱外应用在轨服役寿命要求。

The work aims to verify the protective effect of SiO2 coating on the atomic oxygen erosion resistance of PEI insulation materials. With PEI insulation material of electrical connector selected from the cabin of a spacecraft as the research object and PHPS as the coating material, KH-AORX liquid phase coating method of bottom coating and surface coating was used to directly convert PHPS into silica (SiO2) inorganic protective coating. Based on the requirement of 15-year service life for the model in orbit, a 5-year experiment with total atomic oxygen flux of 2.61×1026 atoms/m2 and the atomic oxygen flux rate of 6.5× 1015 atoms/(cm2.s) was carried out. The changes of material mass loss rate, atomic oxygen denudation rate and appearance before and after the experiment were analyzed. KH-AORX liquid phase coating method could make PHPS coating material act on PEI insulation material and directly convert it into SiO2 protective coating. The edge thickness and center thickness of the coating had good consistency, and the hardness and adhesion of the coating met the design requirements. The mass loss rate of PEI insulator coated with SiO2 was 0.05% after 5 years of atomic oxygen denudation, and 0.29% after 15 years of atomic oxygen denudation after fitting calculation. According to the electron microscope examination, the SiO2 coating on the surface of PEI insulator showed no delamination, peeling and substrate exposure. Using KH-AORX liquid phase coating method to convert PHPS into SiO2 coating on PEI insulation material can obtain a large film with uniform thickness distribution. The SiO2 coating can effectively protect the atomic oxygen resistance of PEI insulation material, and meet the on-orbit service life requirements of extravehicular application.