Effects of additive on the corrosion behaviour of aluminum metal upon exposure to palm biodiesel at room temperature

Abdul Hakim, Muhammad Hafiq (2025) Effects of additive on the corrosion behaviour of aluminum metal upon exposure to palm biodiesel at room temperature. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

This study purposely conducted to investigate the effects of an additive (Pyrogallol, PY) on the corrosion behaviour of aluminum metal when exposed to palm biodiesel (B20) at room temperature by the compliance ASTM G31 static immersion test. The primary objective is to identify the influence of additive on the corrosion rate, pitting formation and the oxidation stability of the aluminum coupon over time. The results of the static immersion test within 30 to 150 days provide significant colour changes in the biodiesel solution particularly in B20+PY. The findings indicate the presence of unsaturated fatty acid methyl ester (FAME) of the biodiesel reaction with the trapped oxygen and the PY. The corrosion rate of the aluminum coupon in B20+PY was consistently lower than the pure B20 throughout the immersion test. The condition supports the suggesting that PY enhances the formation of a protective aluminum oxide layer. Scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analysis post immersion confirmed the formation of this protective oxide layer which was more significant in B20+PY. The findings also show the effectiveness of PY in improving the corrosion behaviour of the aluminum coupon by reducing the oxidative stress and enhancing the natural passivation layer. All of those mentioned play an important role in minimising localized corrosion. It is suggested that further research should include more detailed methodologies for cross sectional analysis in order to asses the corrosion at higher precision.

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