Polyaniline as marine antifouling and corrosion-prevention agent

Using Conducting Polymers as Active Agents for Marine Antifouling Paints

“…Similar results were described by Wang et al 18 According to the authors, coatings formed from PAni-ES, with a bicomponent epoxy resin and PAni/DBSA with polyurethane resin, showed a decrease in electrical conductivity after eight weeks of immersion in the sea and also in antifouling efficiency. For the film formed with SPAN and epoxy resin, which had a lower conductivity compared to other films, the conductivity remained relatively stable.…”

“…These polymers, when doped and conducting, are able to protect steel against corrosion by an anodic protection mechanism, owing to the formation of an iron mixed oxide layer of high protection capacity, as well as being able, in the case of a coating fracture, to regenerate the metal oxide layer. It was reported that, besides the ability to protect metals against corrosion, these polymers also have potential for use as additives in antifouling paints 18 . Paints containing cuprous oxide and polyaniline (PAni), or its sulphonated derivative (SPAN), showed a much more effective antifouling protection than paint containing only cuprous oxide, suggesting a synergistic effect between these two compounds.…”

Electrochemical impedance spectroscopy investigation of chlorinated rubber‐based coatings containing polyaniline as anticorrosion agent

“…Conducting polymers have been extensively studied in recent years due to a great variety of possible applications in several fields, such as energy storage systems [1][2][3], electrocatalysis [4][5][6], electrodialysis membranes [7][8][9][10], sensors [11][12][13], and anticorrosive coatings [14][15][16][17][18][19][20][21][22][23][24][25][26][27]. They exhibit different oxidation states and behave as electronic or mixed conductors [28].…”

“…In some cases, the redox behavior of the coating can provide anodic protection to the substrate [30]. The degree of corrosion protection afforded by a conducting polymer coating depends on both its structural and electronic properties [16,30].…”

“…Among the well-known conducting polymers PAni and polypyrrole drawn particular interest from many researchers owing to their electronic applications, and also because they have been used as anticorrosive coatings for almost two decades [16,31,32]. PAni is one of most readily prepared conducting polymers [33], and has controllable electrical conductivity, excellent environmental stability, and easy processability [34,35].…”