Corrosion behaviour of mild steel coated with epoxy-zinc oxide nanoparticles film in 3.5% WT NaCl solution

Sahatim, Nurshuhadah (2018) Corrosion behaviour of mild steel coated with epoxy-zinc oxide nanoparticles film in 3.5% WT NaCl solution. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The epoxy paint coating is the common paint coating used in industries because of its properties are high thermal and good adhesion but its permeable to aggressive agent caused the corrosion rate increase. Addition of filler inside the epoxy paint coating system used to improve the corrosion protection of the coating system. Thus, this study was conducted to investigate the corrosion behaviour of the mild steel coated with epoxy-zinc oxide nano particles. The preparation of the material will involve with epoxy resin, hardener and zinc oxide particles as the filler in coating system. The epoxy-zinc oxide nano particles paint coating was applied on the mild steel substrate by using hand brush method and let it cure for one day in room temperature. Zinc oxide nano particles filler was added into the epoxy paint coating system with different formulate of zinc oxide content started with 0% wt,5% wt,10% wt,15% wt,20% wt and 25% wt by weight of zinc oxide nano particles. The corrosion behaviour of these epoxy-zinc oxide coating was determined using Open Circuit Potential (OCP) test and Polarization test. The mild steel sample coated addition of 0% wt and 5% wt of zinc oxide particles able to provide better protection as a barrier against the corrosion activities while coating sample with addition of l0% wt,15% wt,20% wt and 25% wtof zinc oxide particles are not able to provide the proper corrosion barrier. Sample with addition of 25% wt zinc oxide particles shows the worst corrosion activities and had being proven by both macroscopic and microscopic observation after all samples were immersed in 3.5% wt of NaCl solution for 30 days. Both of OCP and Polarization test conducted also showed that the addition of 25% wt of zinc oxide particles into the epoxy coating system are not able to provide better corrosion barrier and causes the mild steel substrate to corrode.

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