Polypyrrole/graphene nanosheets/rare earth ions/dodecyl benzene sulfonic acid nanocomposite as a highly effective anticorrosive coating

A Review on Conducting Polymers and Nanopolymer Composite Coatings for Steel Corrosion Protection

“…Ruhi et al [159] reported that the epoxy resin with 3.0 wt.% loading of polypyrrole/SiO 2 composite could passivate the defect up to 99.99% of the corrosion protection efficiency, and steel panel coated such coating suppressed the spread of corrosion and very few blisters were produced; it was a well-adherent, high quality, and superior anticorrosive coating for mild steel substrates. Alam et al [160] synthesized a kind of organic-inorganic nanocomposite (PPy/GNS/RE 3+ /DBSA) involving pyrrole, graphene nanosheets (GNS), rare earth elements (RE 3+ = La 3+ , Sm 3+ , Nd 3+ ) and dodecyl benzene sulfonic acid (DBSA), and the nanocomposite coatings exhibited excellent corrosion protection for carbon steel due to their barrier and passivation behavior. Contri et al [161] found epoxy containing 5 wt.% nanostructured composites based on montmorillonite-polypyrrole exhibited high aspect ratio, easy dispersion, high electrical conductivity, high impedance and enhanced barrier property.…”

Graphene and Graphene/Polymer Composites as the Most Efficient Protective Coatings for Steel, Aluminum and Copper in Corrosive Media: A Review of Recent Studies

“…In recent years, conducting polymer (CP) coatings have exhibited promising performance in enhancing the corrosion inhibition properties of metal substrates, because they are non‐toxic, eco‐friendly, environmentally stable and binds strongly on the metal surface . Conducting polymers can be directly electropolymerized on the surface of metal substrates with proper dopant molecules, leading to conductive and electroactive film possessing inherent reversible redox reactions with the underlying metal .…”

“…It is worth mentioning that through coupling CP coatings with graphene nanosheets, additional corrosion inhibition properties can be observed . Polypyrrole (PPY) and polyaniline (PANI) are considered as the key conducting polymers which have been widely studied as anti‐corrosion materials, arising from their excellent physio‐chemical properties, explained in the following sections.…”

“…Additionally, studies have demonstrated that conducting polymers are capable of electrochemically protecting the exposed areas of the metal substrate and functioning as a self‐healing coating . Hence, graphene and graphene/ conducting polymers composites have been extensively studied for metal protection against degradation, as shown in Figure …”

“…Additionally, the protection capability of the composite coatings vastly rely on the metal substrates on which they are applied . Copper (Cu) is one of these metal substrates extensively utilized in a variety of applications, e. g. tubes, taps, heat exchangers, containers for different liquids and gases, arising from its excellent mechanical workability, and great electrical and thermal conductivity .…”