Abstract: ［Objective］To solve the problem of rapid failure of acrylic polyurethane coating after defects or local damage.［Methods］ This study employed a one-pot synthesis strategy to in situ polymerize pyrrole（PPy） onto the surface of cetyltrimethylammonium bromide（CTAB）-modified graphene，producing Gr-PPy nanoparticles for incorporation into acrylic polyurethane anticorrosion coatings. The microstructure and composition of Gr-PPy nanoparticles were characterized using scanning electron microscopy（SEM），Raman spectroscopy，and Fourier-transform infrared spectroscopy（FT-IR）. The corrosion resistance of the coatings was evaluated via electrochemical impedancespectroscopy（EIS） and neutral salt spray（NSS） tests.［Results］ The acrylic polyurethane coating modified with Gr-PPy powder（PPY）exhibited significantly enhanced corrosion resistance. Notably， the PPY3 coating demonstrated optimal corrosion resistance：after 42 days of immersion in 3. 5%NaCl solution，its impedance modulus at 0. 01 Hz remained at 5. 3×10¹⁰ Ω ·cm²，and it showed the least severe corrosion after 672 hours of NSS test.［Conclusion］The excellent anticorrosion performance of the PPY3 coating was attributed to the synergistic effects of the physical barrier provided by impermeable graphene sheets and the passivation induced by PPy.

Key words: graphene, polypyrrole, synergistic effect, anticorrosive coatings

摘要： 【目的】解决丙烯酸聚氨酯涂层缺陷或局部破损后，涂层快速失效问题。【方法】使用一锅法制备了聚吡咯（ PPy）改性十六烷基三甲基溴化铵（ CTAB）修饰的石墨烯粉末（ Gr-PPy），并将其应用于丙烯酸聚氨酯防腐涂层。通过扫描电镜（ SEM）、拉曼光谱仪和傅立叶变换红外光谱仪（ FT-IR）分析 Gr-PPy纳米颗粒的微观结构和组成，并用电化学阻抗谱和中性盐雾试验评估涂层的耐腐蚀性。【结果】添加 Gr-PPy的丙烯酸聚氨酯涂层（PPY）耐腐蚀性显著提升。其中 PPY3涂层耐腐蚀性最佳，在 3. 5%NaCl溶液中浸泡 42 d后，其低频（ 0. 01 Hz）阻抗模值为 5. 3×10¹⁰ Ω·cm²在 672 h中性盐雾试验后腐蚀情况最轻微。【结论】 PPY3涂层优异的防腐性能归因于抗渗透的石墨烯片的物理屏，障和 PPy的钝化作用。

关键词: 石墨烯, 聚吡咯, 协同作用, 防腐涂料

CLC Number: 

• TQ635. 2