为提高聚苯胺（ PANI）涂层在酸性环境中长期服役稳定性，首先采用一步电聚合引入聚乙烯吡咯烷酮（ PVP）对 PANI进行改性，获得 PANI-PVP底层，随后在 PANI-PVP表面电沉积大分子质子酸植酸（ PA）掺杂的聚吡咯（ PPY）面层，构筑了 PANI-PVP/PPY复合涂层体系。通过傅立叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）、电化学性能测试等手段探讨了该复合涂层与单层 PANI-PVP涂层之间的成分、结构和耐腐蚀性的差异。结果表明： PVP的修饰显著提高了 PANI致密性，减少了 PANI的孔隙缺陷并降低了其自腐蚀电流密度；同时，外层 PPY的引入提高了复合涂层的导电性，使之具有良好的阳极保护功能。且 PANI-PVP/PPY复合涂层服役 360 h对不锈钢仍具有高效的腐蚀防护作用，涂层体系表现出稳定的耐腐蚀性。

In order to improve the stability of polyaniline（PANI）coating during long-term service in acidic environment，PANI was first modified by polyethylpyrrolidone（PVP） through one-step electropolymerization to obtain the PANI-PVP primer coating，and subsequently a macromolecular proton acid（phytic acid，PA）doped polypyrrole（PPY）top coating was electrodeposited to construct the PANI-PVP/PPY composite coating system. The differences in composition，structure，and corrosion resistance between the PANI-PVP/PPY and PANI-PVP coatings were investigated through FT-IR，SEM，and electrochemical tests. The results showed that the modification by PVP significantly improved the compactness，reduced pore defects and the corrosion current density of PANI，meanwhile，the introduction of PPY coating improved the electrical conductivity of the composite coating to provide a satisfactory anodic protection effect. Moreover，the PANI-PVP/PPY composite coating couldstill provide efficient corrosion protection for stainless steel after 360 h service，presenting stable corrosion protection performance.