Abstract
Biodiesel consists of long-chain fatty acid esters and it presents relatively inert behavior right after its production. However, structural changes occur during its storage, as this fuel has low oxidative stability, fact that increases its corrosivity. The problem of corrosion has become increasingly relevant due to the Government's policy of setting a gradual increase in the percentage of biodiesel added to diesel. The current study evaluated the effectiveness of three natural products to work as corrosion inhibitor in biodiesel. The evaluation was done by means of immersion tests and electrochemical impedance spectroscopy. Results showed that it is possible to reduce biodiesel influence on carbon steel corrosion and that it can be extend to other metals used in automotive engines.
Highlights
The sources of sustainable and renewable energy became more attractive due to their environmental benefits
Test NACE TM-0172: this test consisted of checking the visual changes in standard carbon steel bodies-of-evidence unrested immersed for four hours in (BD), (BD+EA), (BD+GP) (BD+BC)
EIS Test: Electrochemical measurements were performed in four different corrosion cell types: BD, biodiesel with stearic acid (BD+EA), BD+GP and biodiesel with Beta-carotene (BD+BC), using the EIS technique
Summary
The sources of sustainable and renewable energy became more attractive due to their environmental benefits. Unlike fossil fuels, which are relatively inert and keep their physical and chemical stability little changed, biodiesel degrades over the time due to oxidation reactions, humidity absorption and microorganism attacks[1] Many products such as peroxides and hydroperoxides are formed as consequence of degradation and they are converted into aldehydes, ketones and acids. Hancsók et al.[11], developed multifunctional additives based on rapeseed oil methyl ester They applied the radical initiation to the widely used thermal synthesis method in an economic way, in order to cause less environmental impact during the production of polyisobutylene (PIB)-succinimide type additives. Yoo et al.[15] investigated the corrosion inhibition behavior of biodiesel-based 2-(2-alkyl-4,5-dihydro-1H-imidazol-1-yl) ethanol derivatives (A-DIEs) They concluded that the presence of double bonds and functional groups in the A-DIE chains and their sufficiently long chain length enhanced the attachment of A-DIEs on the metal surface, leading to high efficiency in corrosion inhibition. Beta-carotene and propyl gallate were selected because they are antioxidant substances
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