Corrosion is a big challenge in various fields that needs to be addressed, especially where metallic components are involved. In this regard, different types of materials have been used and studied to improve the anticorrosion properties of metallic substrates among which conducting polymers (CPs) have gained tremendous attention as anticorrosive coatings. This has opened a new research area for preparing cost-effective coatings with high performance. Among CPs, polypyrrole (PPy) is one of the most promising materials owing to its intrinsic anti-corrosion properties. Various protection mechanisms have been proposed for the PPy-coated metals and alloys, including ennobling or anodic passivation, cathodic protection, mediation of oxygen reduction, barrier protection, controlled inhibitor release mechanism, etc. In this paper, these mechanisms and the effect of different parameters (i.e. the substrate type, using co-polymerized PPy or its derivatives, and using nano-materials) are reviewed and discussed.

在需要解决的各个领域，尤其是涉及金属部件的地方，腐蚀是一个巨大的挑战。在这方面，已经使用和研究了不同类型的材料来改善金属基材的防腐性能，其中导电聚合物（CP）作为防腐涂料引起了极大的关注。这为制备具有成本效益的高性能涂料开辟了一个新的研究领域。在CP中，聚吡咯（PPy）由于其固有的抗腐蚀性能而成为最有前途的材料之一。已经为PPy涂层的金属和合金提出了多种保护机制，包括使能或阳极钝化，阴极保护，氧还原介导，屏障保护，缓蚀剂释放机制等。在本文中，