Environmentally Friendly Anticorrosive Materials-Preparation and Research Progress of Polyaniline Nanocomposites
With good conductivity,pitting resistance,corrosion stability and low cost,polyaniline can be used as a filler in the field of anti-corrosion coatings for metallic materials.However,as a filler for anti-corrosion coatings,the solubility and dispersibility of polyaniline are poor,and the porous structure of polyaniline has weak adhesion to the metal substrates,resulting in unsatisfactory corrosion resistance of the coating.If it can be modified reasonably and effectively,the above problems can be solved.The syn-thetic methods of polyaniline,such as solution polymerization,inverse microemulsion polymerization,tem-plate polymerization,electrochemical polymerization and enzyme catalyzed polymerization,were briefly introduced in the article.In response to the problems in the application of polyaniline in anti-corrosion coatings,the modification and preparation methods of polyaniline nanocomposites were mainly dis-cussed from three aspects:organic acid doping,substitution modification,and in-situ polymerization etc.The interaction between polyaniline molecular chains can be reduced by modification,thereby its solubili-ty and corrosion resistance can also be improved.Then,the research status of graphene oxide/polyani-line,carbon nanotubes/polyaniline,inorganic/polyaniline,and organic/polyaniline nanocomposites in the field of metal corrosion protection in recent years was introduced.Finally,it is pointed out that the prepa-ration process of polyaniline nanocomposites is complicated,which may be affected by environmental factors,and the anti-corrosion mechanism of polyaniline nanocomposites needs to be further clarified at this stage.While the development of"intelligent"polyaniline nanocomposites with long-term stability and strong corrosion resistance will be the future research direction.
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