Research Progress of Modified Polyaniline in Anticorrosive Coatings

Polyaniline has promising prospects in the field of metal corrosion protection due to its reversible redox properties. Investigation on the adhesion, barrier properties and passivation mechanism of modified polyaniline composite coatings is relatively scattered, which needs to be summarized logically. Through the analysis of defects such as poor dispersion and weak hydrophobicity of ordinary polyaniline, this paper reports the research ideas and advances of anticorrosive coatings incorporated polyaniline and its derivative in recent years. The merits of modification strategies under different condition are compared and the relevance between the structure of polyaniline and the corrosion resistance is concluded, further demonstrating that flexible or hydrophobic substituents are conducive to the impermeability of organic coatings. There is also other polyaniline modification approach from the aspects of altering dopant and in-situ polymerization with nano-oxides or graphene for improving anticorrosion performance. The future development trends of the industry are prospected, providing theoretical guidance for the future study.