Abstract
Polymer nanocomposites of polyaniline (PANI)-based metal oxides (SiO2, CeO2, and TiO2A) were synthesized by in situ chemical oxidative polymerization by rapid mixing in a hydrochloric acid medium to evaluate and compare their performance as anti-corrosion coatings on commercial 1018 steel in a 3.5% NaCl medium. The anti-corrosion coatings were developed by dispersing synthesized nanocomposites on an alkydalic resin (AR) for their subsequent electrochemical characterization. X-ray diffraction (XRD) analyses show that PANI has a certain degree of crystallinity in its structure. The incorporation of metal oxide (MO) nanoparticles (NPs) into the polymer matrix was confirmed by scanning electron microscopy and energy-dispersive X-ray spectroscopy (SEM-EDS) analyses, while the interaction of nanoparticles with PANI was proven by Fourier transform infrared (FT-IR) and ultraviolet-visible (UV-vis). Thermogravimetric analysis (TGA) reveals that nanoparticles infer greater resistance to the thermal decomposition of PANI. Finally, the use of open circuit potential (OCP) study, Tafel curves, and electrochemical impedance spectroscopy (EIS) showed that coatings made with TiO2A NPs exhibit the best anti-corrosion properties as compared to those synthesized with SiO2 and CeO2 NPs.
Highlights
Metals and alloys, like steel, are the primary support of the industrial infrastructure due to their mechanical properties, such as high hardness, toughness, and ductility
The products obtained exhibit a compact structure with different types of morphology, mostly nanofibers and irregularly shaped nanoparticles, as well as agglomerated nanofibrous structures. It is consistent with the findings described in the literature [42] for products obtained via rapid mixing synthesis
The products obtained exhibit a compact structure with different types of morphology, mostly nanofibers and irregularly shaped nano9poafr2t0icles, as well as agglomerated nanofibrous structures
Summary
Like steel, are the primary support of the industrial infrastructure due to their mechanical properties, such as high hardness, toughness, and ductility. The corrosion process is inevitable; the useful life of materials can be extended using corrosion inhibitors, cathodic protection, anodic protection, or by the application of organic coatings. The use of organic–inorganic composites as anti-corrosion coatings has been suggested since the organic component, such as a polymer, provides a barrier effect, self-healing, and oxidation–reduction (redox) properties to the coating, while the protection against corrosion is afforded by inorganic pigments acting as inhibitors [4]. The development of polymer nanocomposites as anti-corrosion coatings, based on CPs and metal oxides, provides an improvement in the mechanical and physicochemical properties, such as barrier effect, adhesion, lower porosity, and hydrophobicity in some cases, because organic and inorganic characteristics of the materials are more efficiently combined at the micrometer and nanometer scale [5]
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