Abstract
Biodiesel is an alternative and renewable fuel produced from vegetable oils or animal fats. The poor oxidation stability of biodiesel produces reactive compounds over the period. These products react with metals, which makes the fuel degrade fast and form corrosion on the metal surface. The primary purpose of this study is to evaluate the corrosion behavior of Aegle Marmelos Correa (AMC) biodiesel, diesel, and their blends on aluminum and mild steel metals using electrochemical impedance spectroscopy technique (EIS). EIS is an accurate, fast, and nonconductive method to measure the corrosion of a variety of metals. EIS results show that after 100h immersion in biodiesel and its blends, the polarization resistance (Rp) values of aluminum and mild steel are in the range of 20–30Ohm sq. cm and 22–25Ohm sq. cm, respectively. As immersion time increases to 600h, the Rp values decrease to the range of 17–22Ohm sq. cm and 18–22Ohm sq. cm for aluminum and mild steel, respectively. It can be seen that as the storage time increases, species of biodiesel react with metals and cause more corrosion than diesel. The Nyquist impedance results reveal that metals immersed in 50% of AMC biodiesel produced less corrosion than other biodiesel blends.
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