Preparation and characterization of linseed oil-filled urea–formaldehyde microcapsules and their effect on mechanical properties of an epoxy-based coating

Muhdar, Muhammad Hairy (2022) Preparation and characterization of linseed oil-filled urea–formaldehyde microcapsules and their effect on mechanical properties of an epoxy-based coating. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Nowadays, one popular method for protecting metals against corrosion is to cover their surfaces with a suitable coating material. Corrosion is the degradation of a material's properties as a result of interactions with its environment, and corrosion of the most of metals was inevitable. Self-healing coating is considered one of the smart coatings since it has the potential to heal or repair coating damage in order to avoid additional corrosion. This coating aids in cost reduction and itcan re-self healing form corrosion occurs. The aim of this study is to create self-healing coatings out of polymeric materials and analyse their performance and corrosion behaviour when coated on steel substrates. The self-healing coating that consists of linseed oil microcapsules as healing agent. As this investigation, the self-healing coating is a barrier to protect the steel from corrosion attack. A self-healing coating has recently evolved as one of the smart coating methods used to protect steel from corrosion. Self-healing coating might repair spontaneously by itself. The capacity to self-heal may assist to avoid corrosion and guarantee a long life. The performance of self-healing coating on sample which was we utilised low carbon steel been assessed in a 3.5 wt.% NaCl solution. The mechanical testing has been done on low carbon steel sheet dimensions of 20 mm length x 20 mm width x 2 mm thickness by applying a hardness test. In this work, the fabrication of self-healing coating by in-situ polymerization of urea-formahdehyde to build microcapsules, shell that contain linseed oil as healing agent of 7.5 wt.% been created with ratio 4:1 epoxy and hardener. The immersion test had been performed by immersing the samples in a 3.5 wt.% NaCl solution and separating into three groups which was uncoating, epoxy coating, and self-healing coating in distinct containers. Each container has six samples. The immersion test has been done in 7, 14, 21, 28, and 35 days. The sample has been studied using Scanning Electron Microscope / Energy Dispersive X-Ray (SEM/EDX). The visual inspection of day 35 revealed that the weight loss measurement and corrosion rate measurement of self-healing coating had the lowest value of weight loss and corrosion rate compared to uncoating and epoxy coating. The amount of weight loss increased with each sample, with the range of weight loss varying between 0.058 to 0.151 gram rising for each sample through time. The total average of uncoating was 0.115 gram and epoxy coating was 0.090gram, while for self healing coating was 0.075 gram. Furthermore, the different value of corrosion rate in day 7 was 0.002 (mm/years). Meanwhile the value of corrosion rate for 14, 21, 28, and 35 days shown the uncoating, epoxy coating and self healing coating was been the same value which was 0.001 (mm/years). As the conclusion, from the visual examination of the immersion test had demonstrated that the self-healing coating sample has good corrosion resistance compared to the epoxy coating and uncoating. The effectiveness of self-healing coating as corrosion resistance was shown when the scratch region on sample completely healed.

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