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

Romzei, Norshazlina (2024) Effect of secondary amine concentration on dielectric property of epoxy coating deposited by electrophoretic deposition. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

This study looks at the effect of secondary amine content on the thickness of epoxy coatings applied using electrophoretic deposition (EPD). Epoxy coatings play an important role in corrosion resistance and durability; thus, appropriate coating thickness is critical for efficacy. This work fills a major knowledge gap in understanding how different secondary amine concentrations affect coating characteristics. The study goal is to investigate the effect of secondary amine concentration on epoxy coating thickness, optimise EPD parameters for improved coating microstructure, and evaluate dielectric characteristics using electrochemical impedance spectroscopy (EIS). The technology includes substrate preparation, epoxy solution formulation, precision EPD processing, curing, and sophisticated characterization methods including EIS, Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The results show that an ideal thickness for 0.5 ml and an EPD voltage of 30 volts improve layer homogeneity, adhesion, and deposition efficiency. The EIS study also determines the optimal dielectric constant for a secondary amine concentration of 1.5 ml and an EPD voltage of 40 volts. These findings offer important insights for designing epoxy coatings for specific applications, emphasizing the practical importance of the observed characteristics.

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