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

Dolah, Nur Nadirah (2022) Preparation and characterization of Tung 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, corrosion is a issue that causes substantial harm to metal properties such as carbon steel. It's the deterioration of a material's properties due to interactions with its surroundings, and the corrosion of most metal was unavoidable. Corrosion always occurs when the coating on the steel surface mechanically damages the surface area because of a microcrack or scratch. Furthermore, the cost of repairing the damage is high, and the process is time-consuming. The aim of this study was developing self-healing coating that consists of tung oil microcapsules as healing agent. The self-healing coating is a barrier to protect the steel from corrosion attack. A self-healing coating has recently emerged as one of the smart coating methods used to protect steel from corrosion. Self-healing coating could heal automatically by itself. The ability to self-heal can help to prevent corrosion and ensure a long life. The performance of self-healing coating on low carbon steel as substrate been evaluated in a 3.5 wt% Nacl solution. The mechanical testing has been done on low carbon steel size of 20 mm x 20 mm x 2 mm by microstructure and hardness test. In this study, the preparation by in-situ polymerization of urea-formahdehyde to create microcapsules shell that contain tung oil as healing agent. The microcapsules of tung oil were manually added with epoxy and harderner in a proportion of 7.5 wt% with a ratio of 4:1. The immersion test had been performed by immersing the samples in a 3.5 wt% NaCl solution and dividing them into three groups: uncoating, epoxy coating, and self-healing coating in different containers. Each container has six samples. The immersion test has been done in 7, 14, 21, 28, and 35 days. The sample had been observed using Scanning Electron Microscope / Energy Dispersive X-Ray (SEM/EDX). The visual inspection of day 35 shown that the weight loss measurement and corrosion rate measurement of self-healing coating had the lowest value which is 0.01 gram of weight loss and 0.001 (mm/years) corrosion rate compared to epoxy coating and uncoating. So that, from the visual inspection of the immersion test had shown that the self-healing coating sample has excellent corrosion resistance compared to the epoxy coating and uncoating. The effectiveness of self-healing coating as corrosion resistance was proved when the scratch region on sample fully healed. Thus, self-healing coating can be one as an alternative to help the industries of oil and gas to reduce corrosion attack on platform, onshore or offshore especially for open system.

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