Anticorrosion epoxy coating enriched with hybrid nanozinc dust and halloysite nanotubes

Abstract

In this study, the performance of an epoxy coating with hybrid nanozinc dust and halloysite nanotube (HNT) fillers on the corrosion protection of a carbon steel substrate was investigated. The epoxy resin was mixed with a constant amount of nanozinc dust (1%) and different contents of HNTs (0, 0.5, 1, and 1.5%) with a high speed mixer. Fourier transform infrared spectroscopy and thermogravimetric analysis were used to analyze the interactions between the components in the coating material and the thermal stability of the epoxy coating, respectively. Open-circuit potential, salt spray testing, and microscopy were also used to assess the corrosion resistance of the carbon steel substrate coated with these coating materials. The incorporation of nanozinc in the epoxy coating enhanced the corrosion protection of the carbon steel substrate compared with the pure coating. Furthermore, HNTs further enhanced the corrosion protection. The best protection was achieved when 1% nanozinc and 1% HNT were used. V C 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 955-960, 2013 On the other hand, zinc has been used widely as an anticorrosive coating since 1840. This is due to the properties of zinc itself, which lead to a high anticorrosion efficiency. The incorporation of zinc in epoxy resin (zinc-rich paint) is a well-established method for protecting metal by cathodic protection. 12,13 Kalendov a 11 reported that the smaller size zinc, such as nanozinc exhibited a higher efficiency in anticorrosion compared to the large size zinc on the microscale.

Development and Properties of Polymeric Nanocomposite Coatings

“…Polymeric coatings provide a dense barrier for water and corrosive species from penetrating to the metal surface [16,17,18]. Epoxy resins are used for coating metals due to its strong chemical resistance and adhesion to metal surfaces [19]. However, when the epoxy-based barrier is damaged or scratched, the aggressive agents diffuse into the metal surface and cause corrosion [5].…”

Synergistic effect of nanocoatings for corrosion and wear protection of steel surfaces

“…For instance, at 0.1 and 0.5 wt.% TiO 2 ( Figure 6a) had a lower increase of corroded area at 480 h; 115 % and 44 %, respectively. This could be attributed to increased barrier properties against oxygen and water (Chen et al, 2006;Deyab & Keera, 2014) and due to filling the coatings' pores and voids (Moazeni et al, 2013). The observed increase at 1.0 wt.…”

‘Containers’ for self-healing epoxy composites and coating: Trends and advances

“…Moreover, the inherent corrosion protection capability of halloysite nanotubes and silica nanoparticles [82] will be an added advantage for epoxy coating incorporated with these inorganic materials loaded with corrosion inhibitors. Previously, it was shown that HNTs enhanced the corrosion protection capability of epoxy coating for a carbon steel substrate along with nanozinc dust [83]. Above all, the dimension of the epoxy monomer (diglycidyl ether of bisphenol A) (as per the molecular dynamic simulation studies) [84] is suitable to be loaded even inside the pores in meso-scale.…”