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Properties of Epoxy Coatings Electrodeposited from Cationic Epoxy Suspensions Prepared by Different Secondary Amine's Volumes

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Abstract:

Epoxy resins are widely recognised as the most commonly used polymers, playing a crucial role in both industrial and domestic applications; however, the effect of secondary amine volume on the electrophoretic deposition (EPD) performance of epoxy resin remains underexplored. This study investigates the influence of varying volumes of N-methylethanolamine (MEA) during the synthesis of cationic epoxy on the chemical composition, thickness, surface morphology, and dielectric properties of electrodeposited epoxy coatings at a voltage of 60 V. Cationic diglycidyl ether of bisphenol A (DGEBA) epoxy resin was formulated with 0.5, 1.0, and 1.5 ml MEA, and then deposited onto galvanised substrates via EPD. Increasing the MEA volume from 0.5 ml to 1.5 ml during the formulation of cationic DGEBA resulted in a 50.6% reduction in deposited coating thickness (from 46.6 µm to 23.0 µm) and a 98% decrease in the corresponding dielectric constant (from 102 to 1.98 at a frequency of 1.27 Hz). These variations were confirmed by Fourier-transform infrared spectroscopy, electrochemical impedance spectroscopy, and field-emission scanning electron microscopy, which indicated changes in chemical bonding and surface uniformity. The findings highlight the critical role of MEA volume in determining the performance of electrodeposited epoxy coatings and offer guidance for optimising EPD formulations for improved insulation and structural stability.

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Periodical:

Materials Science Forum (Volume 1164)

Pages:

75-83

DOI:

https://doi.org/10.4028/p-4AeXXI

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Online since:

November 2025

Authors:

Nurhaliana Shazwani Mohd Halim, Norshazlina Romzei, Kok Tee Lau*, Kelly Tau Len Yong, Umar Al Amani Azlan, Ah Heng You

Keywords:

Cationisation, DGEBA, Dielectric Property, Electrophoretic Deposition, Epoxy Resin, Functionalization, Secondary Amine

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© 2025 Trans Tech Publications Ltd. All Rights Reserved

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