High protection performance of vanadium pentoxide-embedded polyfuran/epoxy coatings on mild steel
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High protection performance of vanadium pentoxide‑embedded polyfuran/epoxy coatings on mild steel Joseph Raj Xavier1 Received: 19 May 2020 / Revised: 11 July 2020 / Accepted: 30 September 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract V2O5-incorporated polyfuran (PF) as nanofiller(V2O5-PF) was used to synthesize epoxy (EP)-PF/V2O5 nanocomposites. The PF-functionalized V 2O5 nanoparticles were characterized by Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). The corrosion protection performance of these coatings on mild steel in natural seawater was determined by electrochemical measurements. Results from electrochemical techniques revealed the superior anticorrosive activity of nanocomposite coatings compared to those of plain epoxy coatings. The superior anticorrosive property of the proposed nanocomposite coatings provides a new horizon in the development of high-performance anticorrosive coatings for various industries. Incorporating PF-functionalized V2O5 nanoparticles into the epoxy coating ensued in the blockage of charge transfer at metal–electrolyte interface which hindered the dissolution of metal/alloy. Scanning electrochemical microscopic (SECM) studies detected lower corrosion current on the EP-PF/V2O5 nanocomposite coated mild steel surface. SEM/EDX analysis examined the corrosion products which acted as the passive layer that reduced the dissolution of steel. The inclusion of PF-functionalized V2O5 nanoparticles to EP improved the mechanical properties of the coated surface which complimented the electrochemical studies. Keywords Polyfuran · V2O5 · Epoxy · Nanocomposite coatings · Corrosion · EIS · SECM
* Joseph Raj Xavier [email protected] 1
Department of Chemistry, Vel Tech Rangarajan Dr. Sagunthala R & D Institute of Science and Technology, Avadi, Chennai 600 062, Tamil Nadu, India
13
Vol.:(0123456789)
Polymer Bulletin
Introduction Corrosion of metals and alloy causes degradation of materials used in railways, thermal power plants, automobiles, river bridges, and other industrial infrastructures. This leads to the huge loss of economy [1–4]. Various polymeric coatings were used to control such losses and to enhance the life of various metals/alloys. The protection of such systems is achieved by synthetic polymer-based anticorrosive paints and coatings. The epoxy resins have good chemical, physical, thermal, and mechanical properties and are in the top list in the field of industrial coating. The presence of pores in the polymeric coating leads to the diffusion of corrosive ions to the metal coating and reduces higher corrosion resistance. New generation advanced modified epoxy coatings with superior mechanical and anticorrosive properties have been developed [5–10]. The conducting polymers have achieved the path breaking success in the field of corrosion protection due to their low cost, easy synthesis, redox reversibility, and good chemical st
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