Malaysian Journal of Analytical Sciences Vol 19 No 4 (2015): 679 - 691

 

 

 

KESAN MINYAK SAWIT MERAH SEBAGAI PERENCAT KAKISAN TABII TERHADAP KELULI KARBON DAN KELULI LEMBUT DALAM 1 M ASID HIDROKLORIK (HCl)

 

(Effect of Red Palm Oil as a Natural Corrosion Inhibitor toward Carbon Steel and Mild Steel in 1 M of Hydrochloric Acid Solution)

 

Siti Rahimah Mohamad Shafiee¹, Airul Ashri¹, Muhammad Yusri Zulkafli², Norinsan Kamil Othman², Azwan Mat Lazim¹*

 

¹Program Sains Kimia, Pusat Pengajian Sains Kimia dan Teknologi Makanan,

 ²Program Sains Bahan, Pusat Pengajia Fizik Gunaan,

Fakulti Sains dan Teknologi,

Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia

 

*Corresponding author: azwanlazim@ukm.edu.my

 

 

Received: 30 April 2015; Accepted: 29 June 2015

 

 

Abstrak

Penggunaan perencat kakisan tabii adalah sebagai satu alternatif kepada penggunaan perencat kakisan sintetik dan bukan organik. Pemilihan minyak sawit merah sebagai perencat kakisan tabii adalah kerana minyak tersebut kaya dengan molekul beta karoten dan vitamin E yang terkandung di dalam minyak tersebut mempunyai sifat anti-pengoksidaan yang tinggi. Selain itu, kehadiran heteroatom molekul dalam sebatian minyak sawit merah dapat memberikan penjerapan yang baik pada permukaan keluli dan seterusnya menghalang kakisan. Kajian ini dijalankan bagi mengkaji keberkesanan minyak sawit merah sebagai perencat kakisan tabii terhadap keluli lembut dan keluli karbon dalam media asid hidroklorik (HCl) berkepekatan 1 M. Tujuan utama kajian ini juga adalah untuk mengenalpasti kumpulan berfungsi dalam minyak sawit merah dan melakukan analisis morfologi permukaan keluli selepas direndam dalam larutan media berperencat dan larutan media tanpa perencat. Melalui ujian kehilangan berat dan kaedah polarasi Tafel, kedua-dua keluli mengalami penurunan kadar kakisan dan kecekapan perencat meningkat mengikut penambahan kepekatan minyak sawit merah. Berdasarkan kepada imej mikrograf Mikroskop Elektron Pengimbas (SEM) jelas menunjukkan kesan permukaan yang licin dan tidak berlubang apabila keluli direndam dalam larutan bersama perencat kakisan.Pencirian minyak sawit merah dengan menggunakan instrumen seperti Infra-Merah Transformasi Fourier (FTIR) dan Kromatografi Gas (GC) telah membuktikan kehadiran beberapa molekul heteroatom yang bertindak melakukan jerapan pada permukaan logam.

 

Kata kunci: minyak sawit merah, perencat kakisan, keluli karbon, keluli lembut

 

Abstract

The utilization of natural corrosion inhibitor is an alternative of the uses of synthetic corrosion inhibitors and non-organic inhibitors.The selection of red palm oil as a natural corrosion inhibitor is because the oil rich in beta-carotene molecules and vitamin E contains in the oil is high in antioxidant properties. Beside that, the presences of heteroatom molecules in red palm oil will give better adsorption on the surface of the steel and thus prevent corrosion. This research is carried out to investigate the effectiveness of using red palm oil as corrosion inhibitor for mild steel and carbon steel in 1 M hydrochloric acid solution. The aim of this research is to identify the functional group in the red palm oil and perform morphological analysis on the steel surface after being immersed in medium solution with inhibitor and medium solution without inhibitor. Based on weight loss and Tafel polarization method, both steels undergone the reduction in rate of corrosion and the efficiency of inhibitor increased with the addition of red palm oil. Based on the image captured by Scanning Electron Microscope, it is clearly showed that the surface of steel coated with red palm oil is less corroded compared to uncoated steel. The characterization of red palm oil using instruments such as Fourier Transform Infrared Spectrometer (FTIR) and Gas chromatography (GC) has prove the existence of a few heteroatom molecules that acts as an adsorbent on the surface of the steel.

 

Keywords: red palm oil, corrosion inhibitor, carbon steel, mild steel

 

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