Effect of secondary amine oxidation on dielectric property of epoxy coating deposited by electrophoretic deposition

Mohd Saed, Mohamad Azrul Azizie (2024) Effect of secondary amine oxidation on dielectric property of epoxy coating deposited by electrophoretic deposition. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

With the goal to ensure corrosion resistance and longevity, this study explores the effects of different secondary amine concentrations on the thickness of epoxy coatings applied using electrophoretic deposition (EPD). The goal of the study is to understand the connection between coating qualities and secondary amine concentration, filling in a major knowledge gap. It involves regulating various parameters such as suspension concentration, applied voltage, deposition time, electrophoretic mobility, and others to better understand the behavior of these components during the coating process. Importantly, the change in secondary amine concentration aims to explore how different materials interact and can be applied at varying thicknesses on desired conductors. The mixing of amine and epoxy resin, followed by controlled heating and pH adjustment using formic acid, is a crucial part of the process. However, it's also noteworthy to consider the potential impact of secondary amine oxidation during EPD. Secondary amines can undergo oxidation, which might affect epoxy behavior during the deposition process, potentially influencing the properties of the resulting coatings. The main objective is to use electrochemical impedance spectroscopy (EIS) to assess dielectric characteristics and optimise EPD settings to produce a better coating microstructure. Preparing the substrate, creating the epoxy solution, processing the EPD with care, curing, and using sophisticated characterization methods such as FTIR, SEM, and EIS are all part of the extensive process. Moreover, the optimal dielectric constant for a 1.5 ml secondary amine concentration and a 40-volt EPD voltage is determined via EIS analysis. Interestingly, these results highlight the usefulness of the reported characteristics in many contexts, such as ambient and nitrogen conditions, providing important information for developing epoxy coatings customised for certain uses.

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