Evaluation of the Thermal properties of Epoxy-Agro waste (Egg shell and Palm kernel shell) Nanoparticle coating for Mild Steel

Maureen Oi̇sakede

doi:10.34248/bsengineering.910691

Abstract

Epoxy has been widely used as a coating material to protect the steel reinforcement in concrete structures, because of its outstanding processability, excellent chemical resistance, good electrical insulating properties, and strong adhesion/affinity. The major disadvantage raised from exothermic curing reaction of highly crosslinked epoxy matrix is brittleness and microcracks that change the epoxy coating performances. The barrier performance of epoxy coatings can be enhanced by the incorporation of inorganic filler particles at nanometer scale which can be dispersed within the epoxy resin matrix to form an epoxy nanocomposite. The parametric addition of eggshell ash nanoparticles (ESAnp) and palm kernel shell ash nanoparticle (PKSAnp) in epoxy for the coating of mild steel was studied. Thermal decomposition was observed in terms of global mass loss by using a TGA Q50 thermogravimetric analyzer. Improvement of 78.05% and 82.56% thermal properties were obtained for the epoxy-4wt%ESAnp and epoxy-5wt%PKSAnp at 1000°C. This work showed that epoxy-4wt%ESAnp and epoxy-5wt%PKSAnp have best properties for thermal applications.

Highlights

Steels are vital construction materials in our modern society; the corrosion protection of steel is of great importance, both to ensure safety and to reduce costs associated to corrosion
DTA/TGA Thermal Analysis of the palm kernel shell ash nanoparticle (PKSAnp) and eggshell ash nanoparticles (ESAnp) The temperature of destruction (Tdes) of the nanoparticle was determined from DTA curves
At temperature above 1000°C, the residual weight stabilized agrees with the silica and CaO content in PKSAnp this is in par with the earlier reported in literature (Akash et al, 2017; Hussain et al, 2019)

Summary

Introduction

Steels are vital construction materials in our modern society; the corrosion protection of steel is of great importance, both to ensure safety and to reduce costs associated to corrosion. Epoxy coatings generally reduce the corrosion of a metallic substrate subject to an electrolyte in two ways They act as a physical barrier layer to control the ingress of deleterious species. They can serve as a reservoir for corrosion inhibitors to aid the steel surface in resisting attack by aggressive species such as chloride anions (Ehsan et al, 2014). Other binders such as phenolic or epoxy are used to prepare high thermal-resistant coatings, at present silicon containing coatings dominate the market. This work evaluates the thermal properties of developed epoxy-agro waste nanoparticle coating for mild steel

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