Interfacial, electrical, and mechanical properties of polyurethane (PU)-type aircraft topcoat layers for LSP (Lightning Strike Protection) was evaluated by 2-D electrical resistance (ER) mapping with different oxidation times. Multi-wall carbon nanotubes (MWCNT) were treated using hydrogen peroxide to improve dispersion. Mechanical property of MWCNT/PU topcoat was determined via thin film tensile test, and oxidation degree was determined using TGA and EDS. Static contact angle measurements were used to evaluate work of adhesion between MWCNT and PU coating layer. Interfacial adhesion between MWCNT and PU coating layer was obtained via pull-out test and both results were consistent with different MWCNT oxidation times. Electrical properties of MWCNT/PU topcoats were evaluated by surface ER. Surface ER was the lowest at 5 days oxidation times. Higher tensile strength of MWCNT/PU topcoat could contribute to higher interfacial adhesion. Visualization was used to determine MWCNT dispersion and verified successfully using the color variation of 2D ER mapping.

用于 LSP（雷击保护）的聚氨酯 (PU) 型飞机面涂层的界面、电气和机械性能通过具有不同氧化时间的二维电阻 (ER) 映射进行评估。使用过氧化氢处理多壁碳纳米管 (MWCNT) 以改善分散。MWCNT/PU面漆的力学性能通过薄膜拉伸试验测定，氧化度通过TGA和EDS测定。静态接触角测量用于评估 MWCNT 和 PU 涂层之间的粘附作用。MWCNT 与 PU 涂层之间的界面附着力是通过拉出测试，两个结果都与不同的 MWCNT 氧化时间一致。MWCNT/PU 面漆的电性能通过表面 ER 进行评估。表面 ER 在 5 天氧化时间时最低。MWCNT/PU 面漆更高的拉伸强度有助于提高界面附着力。可视化用于确定 MWCNT 色散，并使用 2D ER 映射的颜色变化进行了成功验证。