Influence of SiO2 Content and Exposure Periods on the Anticorrosion Behavior of Epoxy Nanocomposite Coatings

Alam Alam,Samad Samad,Poulose Poulose,Alharthi Alharthi,Al-Zahrani Al-Zahrani,Sherif Sherif,Mohammed Mohammed

doi:10.3390/coatings10020118

Abstract

Epoxy coating formulations containing 1%, 3%, and 5% SiO2 nanoparticles were produced and applied on a mild steel substrate to achieve the objective of high performance corrosion resistance. The electrochemical impedance spectroscopy (EIS) technique was employed to measure the anticorrosive properties of coatings. The corrosion tests were performed by exposing the coated samples in a solution of 3.5% NaCl for different periods of time, varied from 1 h and up to 30 days. Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD) analyses revealed the presence of nanoparticles in the final cured samples. Establishing the incorporation of the nanoparticles in the coating formulations was confirmed by employing both of XRD and FT-IR techniques. The FT-IR spectra have proved to be satisfactory indicating that there was a complete reaction between the epoxy resin with the hardener. EIS measurements confirmed that the presence and the increase of SiO2 nanoparticles greatly improved the corrosion resistance of the epoxy coating. The highest corrosion resistance for the coatings was obtained for the formulation with 5% SiO2 nanoparticles content, particularly with prolonging the immersion time to 30 days.

Highlights

In order to protect metal from corrosion, the metal surfaces are isolated from the environment with the help of polymeric coatings, as this is still the most conventional method to mitigate corrosion [1].The properties of these coatings are modified with the help of nano fillers such as TiO2 [2], ZnO [3], ZrO2 [4] and SiO2 [5] etc., to enhance the life and durability of coatings.Silica nanoparticles have been studied for their ability in improving the scratch and abrasion resistance as well as the anticorrosion properties of the coatings [6]
Fourier transform infrared spectroscopy (FT-IR) results confirmed the presence of the SiO2 nanoparticles in addition to the completion of the curing reaction between resin and hardener
X-ray diffraction (XRD) results did not show any structural changes in epoxy coatings with addition of the

Summary

Introduction

In order to protect metal from corrosion, the metal surfaces are isolated from the environment with the help of polymeric coatings, as this is still the most conventional method to mitigate corrosion [1].The properties of these coatings are modified with the help of nano fillers such as TiO2 [2], ZnO [3], ZrO2 [4] and SiO2 [5] etc., to enhance the life and durability of coatings.Silica nanoparticles have been studied for their ability in improving the scratch and abrasion resistance as well as the anticorrosion properties of the coatings [6]. In order to protect metal from corrosion, the metal surfaces are isolated from the environment with the help of polymeric coatings, as this is still the most conventional method to mitigate corrosion [1] The properties of these coatings are modified with the help of nano fillers such as TiO2 [2], ZnO [3], ZrO2 [4] and SiO2 [5] etc., to enhance the life and durability of coatings. Ghanbari and Attar [7] treated silica nanoparticles with 3-Glycidoxypropyltrimethoxysilane for proper dispersion and mixed in polymer matrix Their epoxy coated mild steel samples were subjected to be investigated via its corrosion performance. Conradi et al [8] prepared and applied silica modified coatings onto the surface of type

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