Malaysian Journal of Analytical Sciences, Vol 28 No 4 (2024): 746 - 757

 

EVALUATION OF Caulerpa lentilifera (SEAGRAPE) EXTRACT AS A POTENTIAL ANTI-CORROSION ADDITIVE IN EPOXY COATING FOR MILD STEEL PROTECTION IN THE MARINE ENVIRONMENT

 

(Penilaian Ekstrak Caulerpa lentilifera (Anggur Laut) sebagai Bahan Tambahan Berpotensi Anti-Kakisan dalam Salutan Epoksi untuk Perlindungan Keluli Lembut dalam Persekitaran Marin)

 

Noradhiha Farahin Ibrahim, Aina Zulaikha Mohd Zuraimi, Wan Mohd Norsani Wan Nik,

Wan Rafizah Wan Abdullah, and Mohammad Fakhratul Ridwan Zulkifli*

 

Faculty of Ocean Engineering Technology, Universiti Malaysia Terengganu, 21030 Kuala Nerus, Terengganu, Malaysia

 

*Corresponding author: fakhratulz@umt.edu.my

 

 

Received: 28 November 2023; Accepted: 2 June 2024; Published:  27 August 2024

 

 

Abstract

Corroded metals have gained considerable attention due to the significant economic losses they cause, both financially and in terms of their impact on the marine environment. Numerous attempts have been made to mitigate the effects of corrosion using different preventive techniques, including the incorporation of corrosion additives into protective coatings. One such additive, Caulerpa lentilifera (CL), commonly known as seagrape, was studied for its potential as a green corrosion additive in epoxy coatings. The anticorrosive activity of various amounts of CL extract (1-5 wt%) added to epoxy coatings on mild steel in a 3.5 wt% NaCl solution was examined using the potentiodynamic polarization (PdP) technique. Fourier Transform Infrared (FTIR) analysis was also conducted to identify the primary phenolic components present in the CL extract. Electrochemical analysis showed that the addition of CL extracts significantly decreased the corrosion rate compared to bare mild steel. According to the findings, epoxy coatings containing 3 wt% CL extracts exhibited 24% more anticorrosive performance compared to the bare sample. Therefore, CL extract shows promising potential as an anti-corrosion additive in epoxy coatings for marine applications.

 

Keywords: Caulerpa lentilifera, epoxy coating, anticorrosion properties, corrosion additive, eco-friendly

 

Abstrak

Logam berkarat telah mendapat perhatian yang cukup besar kerana kerugian ekonomi yang ketara, baik dari segi kesan kewangan mahupun kesannya terhadap alam sekitar marin. Pelbagai usaha telah dilakukan untuk mengurangkan kesan kakisan dengan menggunakan teknik pencegahan yang berbeza termasuk penggabungan bahan tambahan kakisan dalam salutan pelindung. Caulerpa lentilifera (CL), biasanya dikenali sebagai anggur laut, dikaji untuk bahan tambahan kakisan hijau yang berpotensi dalam salutan epoksi. Aktiviti anti-menghakis dari pelbagai komposisi ekstrak CL (1-5% berat) yang ditambahkan ke dalam salutan epoksi pada keluli lembut dan diletakkan ke dalam larutan 3.5% garam natrium klorida telah diperiksa menggunakan teknik polarisasi potensiodinamik (PdP). Analisis inframerah transformasi Fourier (FTIR) juga telah dilakukan untuk mengesahkan komponen fenolik utama yang terdapat dalam ekstrak CL. Analisis elektrokimia menunjukkan bahawa penambahan ekstrak CL kadar kakisan telah menurun dengan ketara berbanding keluli lembut yang kosong. Menurut penemuan, salutan epoksi yang mengandungi 3 % berat ekstrak CL menunjukkan prestasi anti-menghakis 24% lebih banyak berbanding dengan sampel kosong. Oleh itu, ekstrak CL mempamerkan potensi yang menjanjikan sebagai bahan tambahan anti-kakisan dalam salutan epoksi untuk aplikasi marin.

 

Kata kunci: Caulerpa lentilifera, salutan epoksi, sifat antikakisan, bahan tambahan kakisan, mesra alam

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