Sains Malaysiana 54(2)(2025): 589-599

http://doi.org/10.17576/jsm-2025-5402-23

Improving Corrosion Protection of Urethane Acrylate UV Curable Coatings Derived from Palm Oil via Graphene Oxide Particle Incorporation

(Peningkatan Perlindungan Kakisan Salutan Uretana Akrilat Pengawetan UV daripada Minyak Sawit melalui Penggabungan Zarah Oksida Grafena)

MOHD SOFIAN ALIAS^1,4, RABIAHTUL ZULKAFLI², NORINSAN KAMIL OTHMAN^1,*, MOHD SUZEREN MD. JAMIL³, SITI RADIAH MOHD KAMARUDIN⁴, SITI FATAHIYAH MOHAMAD⁴, MOHD HAMZAH HARUN⁴, MAHATHIR MOHAMED⁴ & MAZNAH MAHMUD⁴

¹Materials Science Programme, Department of Applied Physics, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia
²Department of Earth Sciences and Environments, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia
³Department of Chemical Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia
⁴Malaysian Nuclear Agency, Bangi, 43000 Kajang, Selangor, Malaysia

Diserahkan: 14 Oktober 2024/Diterima: 12 November 2024

Abstract

This study explores the enhancement of corrosion protection properties in urethane acrylate UV-curable coatings derived from palm oil through the incorporation of graphene oxide particles (GOP). GOP were added into palm oil-based urethane acrylate (POBUA) using a sonication technique. The performance of POBUA with the influence of GOP was determined using Thermal Gravimetric analysis (TGA) and Field Emission Scanning Electron Microscopy (FESEM). Meanwhile, the corrosion testing was confirmed by electrochemical testing of Electrochemical Impedance Spectroscopy (EIS). TGA demonstrated that the presence of GOP a coating additive, improved the coating in the POBUA, enabling better heat absorption. This is because more energy was required to break the polymer chain during decomposition. Additionally, EIS showed that the diffusion of corrosive ions was hindered due to the tortuous pathways created by the GOP within the POBUA network. The highest Rct value of POBUA coating with 0.5 wt% GOP give 99.64% corrosion protection for mild steel which significantly improved compared to neat POBUA coating which only 63.6% corrosion protection. Furthermore, contact angle analysis showed the presence of GOP improved hydrophobicity properties of POBUA coating contributing to their excellent corrosion resistance. These findings highlight the potential of POBUA/GOP curable coatings for providing effective protection of mild steel surfaces.

Keywords: Corrosion protection; graphene oxide particles; palm oil; UV curable coating

Abstrak

Penyelidikan ini meneliti penambahbaikan sifat perlindungan kakisan dalam salutan penyembuhan UV uretana akrilat yang berasal daripada minyak sawit (POBUA) melalui penggabungan zarah oksida grafin (GOP). GOP telah ditambah ke dalam uretena akrilat minyak sawit menggunakan teknik sonikasi. Prestasi POBUA dengan pengaruh GOP telah ditentukan menggunakan analisis gravimetri termal (TGA) dan mikroskopi imbasan elektron imbasan medan (FESEM). Sementara itu, ujian kakisan disahkan melalui ujian elektrokimia iaitu spektroskopi impedans elektrokimia (EIS). TGA menunjukkan bahawa kehadiran GOP dalam salutan POBUA meningkatkan penyerapan haba, kerana lebih banyak tenaga diperlukan untuk memecahkan rantai polimer semasa penguraian. Selain itu, EIS menunjukkan bahawa penyebaran ion kakisan terhalang disebabkan oleh laluan berliku yang dicipta oleh GOP dalam rangkaian POBUA. Nilai Rct tertinggi bagi salutan POBUA dengan 0.5 wt% GO memberikan perlindungan kakisan optimum iaitu sebanyak 99.64% berbanding salutan POBUA yang hanya memberikan 63.6% perlindungan kakisan tehadap keluli lembut. Selain itu, analisis sudut sentuhan menunjukkan kehadiran GOP meningkatkan sifat hidrofobik salutan POBUA. Penemuan ini menonjolkan potensi salutan POBUA/GOP sebagai salutan perlindungan karat bagi permukaan keluli lembut.

Kata kunci: Minyak sawit; perlindungan karat; salutan penyembuhan UV; zarah gentian oksida

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*Pengarang untuk surat-menyurat; email: insan@ukm.edu.my