Corrosion behaviour of mild steel coated with epoxy-graphene film in 3.5 wt.% NaCI solution

Ahmad Fadzi, Ahmad Ridhwan (2017) Corrosion behaviour of mild steel coated with epoxy-graphene film in 3.5 wt.% NaCI solution. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Corrosion can be a major problem for most of the material nowadays and as the countermeasure for the corrosion problem, a coating system were developed. Coating system can come in many ways suitable with different application. Paint coating can be say as the one of the most basic type of coating available. Addition of filler inside the epoxy paint coating system can help improving the corrosion protection of the coating system. Type and quantity of the filler selected in improving the epoxy coating need to be studies first before it is can be applied. This study will be focus on the study of the corrosion behaviour of the epoxy-graphene coating system. The preparation of the material with involve with epoxy resin, hardener and graphene as the filler in the coating system. The epoxy-graphene paint coating was applied on the mild steel substrate by using hand-brush method and let it cure for one day in room temperature. Graphene filler was added into the epoxy paint coating system with different formulate of the graphene content started with 0%, 2%, 4%, 6%, 8% and 10% by weight of the graphene. The corrosion behaviour of these epoxy-grapheme coating was determined using Open Circuit Potential (OCP) test and Polarization test. The mild steel sample coated addition of 0% and 2% of graphene able to provide better protection as a barrier against the corrosion activities while coating sample with addition of 4%, 6%, 8% and 10% of graphene content are not able to provide proper corrosion barrier. Sample with addition of 10% of the graphene shows the worst corrosion activities proven by both macroscopic and microscopic observation after all samples were undergoes with immersion in 3.5% of NaCl solution for 30 days. Both OCP and Polarization test conducted also showed that the addition of 10% of graphene 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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