Abstract
Corrosion of biodiesel-filled fuel tanks has become a major problem in the use of biodiesel as a new green energy source. The ionic liquid 1-Hexyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide [C10H19N2]+[C2F6NO4S2]− was used to control corrosion of C-steel in non-edible biodiesel to resolve this problem. The anti-corrosion and antioxidant properties of the [C10H19N2]+[C2F6NO4S2]− were characterized using weight loss, electrochemical impedance spectroscopy, total acid number measurements beside SEM and EDX analysis. The findings show that [C10H19N2]+[C2F6NO4S2]− plays an important role in preventing C-steel corrosion in biodiesel with an efficiency close to 99 percent. The adsorption capability and antioxidant properties of [C10H19N2]+[C2F6NO4S2]− are the major contributors to the ionic liquid's anti-corrosion properties. We anticipate that this work will help to sustainable expand the use of biodiesel as a renewable energy source.
Highlights
Corrosion of biodiesel-filled fuel tanks has become a major problem in the use of biodiesel as a new green energy source
The necessity to control corrosion in fuel tanks containing biodiesel motivated us to explore the anti-corrosion properties of ionic liquid [ C10H19N2]+[C2F6NO4S2]−, that could serve as informative to control the corrosion of C-steel in biodiesel. [C10H19N2]+[C2F6NO4S2]−, reveals an effective new C-steel corrosion inhibitor in biodiesel
The inhibition mechanism is based on the ionic liquid’s mixed physisorption and chemisorption. [C10H19N2]+[C2F6NO4S2]− molecules cover the surface of C-steel sheets, preventing biodiesel corrosive attack on steel sites
Summary
Corrosion of biodiesel-filled fuel tanks has become a major problem in the use of biodiesel as a new green energy source. Several previous studies have shown that the rate of corrosion in the fuel tank containing biodiesel is much higher than that containing petrodiesel. This is due to many factors such as hygroscopic nature of biodiesel and biodiesel oxidation[8]. High corrosion resistance alloys are expensive and require special manufacturing capabilities when used in the manufacture of fuel t anks[11,12] In this regard, some organic compounds, surfactants and plant extracts were used to protect the fuel tank from corrosion in biodiesel. We continue our research in this area by using a new class of compounds, ionic liquids, as a new additive in non-edible Neem oil biodiesel to prevent corrosion in the fuel tank. Ionic liquids are frequently used in smaller quantities than conventional corrosion inhibitors, leading to reduced cost
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