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

Md. Akhir, Muhammad Syafiq (2023) Preparation and characterization of linseed/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

One of the most formidable foes that metals have to contend with is corrosion. It is a natural occurrence that is brought on by the interaction of metal and the components of the environment. Nowadays, applying a protective coating to metal surfaces is a common method of protecting them against corrosion. In the event of defect such as crack, scratch and other unexpected damage on steel or pipeline, this layer may be rendered useless. A selfhealing coating was a new coating method for preserving steel against corrosion. There were self-healing coatings that can fix themselves. Self-healing coating is one of the smart coatings that may mend or restore coating damage in order to prevent additional corrosion. Micro container releases included into the polymer enable active functioning. The selfhealing properties of this coating help to save costs. The goal of this research project to developing self-healing coatings from polymeric materials and evaluating their performance and corrosion behavior on steel substrates. In this self-healing coating, Linseed oil have been mixture with Tung oil to get microcapsules and work together to repair the scartch at the low carbon steel. According to this research, the steel have been protected from corrosion by a self-healing coating. The self-healing coating on low carbon steel substrate in a 3.5wt% NaCl solution have been tested. Low carbon steel substrate with dimensions of 20mm length x 20mm width x 2mm thickness have been subjected to a hardness test for mechanical testing. To fabricate microcapsules that contain 50% linseed oil and 50% tung oil as a healing agent, this study had used an epoxy and hardener ratio of 4:1 to make microcapsule shells and have been analyse by using Attenuated total reflection - Fourier-transform infrared (ATR-FTIR). Immersion tests have been carry out by separating the samples into three categories: uncoated, epoxy-coated, and self-healing coated, all in a 3.5 wt% NaCl solution. There were 7, 14, 21, 21, 28 and 35 day intervals in which the immersion test have been done. Material characterizaion have been examined using a Scanning Electron Microscope / Energy Dispersive X-Ray (SEM/EDX). The result on analysis, the scratch on the substrate self healing coating were closed and protect the substrate from corrosion while for uncoated substrate the scratch were not closed and corrosion have been happen. The result after 35 days, the average weight loss for self healing coated was 0.008g, epoxy coated was 0.11g and uncoated was 0.029g and corrosion rate was 0.0039g for self healing coated, 0.0056 for epoxy coated and 0.0142 for uncoated. Based on this two measurements, self-healing coating have been the lowest values compared to uncoating and epoxy coating. The visual inspection when comparing the self-healing coating sample to epoxy coating and uncoating, the visual evaluation of the immersion test have been demonstrate greater corrosion resistance. The EDX result also have been prove that self healing coating were closed the scartch and uncoated were not based on Fe, which are 5.50wt% for self healing sample and 95.44wt% for uncoated sample. As conclusion, corrosion resistance was proved by the sample's ability to completely heal a scratch. The application of this self-healing coating can be use on oil and gas industry.

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