Corrosion of the metal parts of diesel engines in biodiesel-based fuels

Abstract

Biodiesel, an environmentally-friendly bio-fuel, has been regarded as one of the most promising alternatives to fossil fuels whose use is rampant in the transportation sector. However, it is important that the corrosive effects of this fuel on engines are studied. This work reviews the corrosiveness that biodiesel exerts on various engine components, especially those made out of metals. First, an analysis of the corrosion mechanisms of metals exposed to biodiesel is provided. The conventional and advanced analysis methods will be applied to measure the level of corrosiveness in static immersion test, and to assess the formation of secondary products, if any, in biodiesel and any metal strips in contact with biodiesel-based fuel. The use of inhibitions to guard against corrosion will be mentioned. Lastly, several significant causes of metal corrosion, namely, the presence of dissolved oxygen and oxidation products, TAN change, a rise in dissolved water, the presence of metals, and the changes in biodiesel properties will also be presented. ©2019. CBIORE-IJRED. All rights reserved

Assessment on the Effective Green-Based Nepal Origin Plants Extract as Corrosion Inhibitor for Mild Steel in Bioethanol and its Blend

“…Bioethanol produced from different types of biomasses is becoming nowadays one of the promising renewable biofuels, unlike non-renewable petroleum-based fuels. Bioethanol blended fuel is generally used as a gasoline additive in ordinary vehicles in most parts of the world, where the fuel system and engine parts are mostly composed by the metallic substances like iron, copper and aluminum, and their alloys so on [6]. The global bioethanol industry has witnessed high growth primarily because of the mandatory usage of bioethanol fuel blends, especially in transportation vehicles in many countries those are looking for an alternative fuel source with less greenhouse gases (GHG) emissions.…”

Catalyst and Elemental Analysis Involving Biodiesel from Various Feedstocks

“…A high S content can affect the performance of engines [91], and the maximum limit set for sulphur in biodiesel is 10 mg/L [70,92]. It was observed that both biodiesels passed this test, which reduces corrosion in fuel containers [12]. The main source of metals in vegetable oil is either its presence in raw material or contact with the manufacturing process and storage [40], as degradation and contamination happen due to undesirable compounds in the engine [31].…”

“…The presence of inorganic constituents in biodiesel can affect the quality of the fuel and cause the malfunctioning of engines [87], and since different materials are used for storage containers and engine parts, there is an issue with compatibility [93]. Corrosion in biodiesel is mainly due to the component nature and composition of biodiesel, as well as the environment [12,94]. Metallic storage tanks such as stainless steel and Al are normally used for storage [95], while in automobiles, the fuel is in direct contact with various parts of the engine like the fuel pump, fuel injector, pistons and piston rings, which are made of Cu, Al, brass-Br (copper-rich alloy) and bronze [93].…”

“…Contrarily, this study had Fe as the most catalytic effect in reducing the induction period and it became constant after 500 ppm of metal concentration for both biodiesels. Additionally, Palm biodiesel proved to have to degrade more and was found to have the most corrosiveness [12].…”

“…In 2008, it was reported that the transportation sector contributed to about 23% of total CO 2 emissions globally [7,8], with 73% of this contribution made by road transport [9], while the contribution from fuel combustion increases by 1.6% per year [1]. This will lead to severe ecological impacts, namely air and noise pollution, an increase in global surface temperatures (excess of 6 • C), changes in rainfall patterns and subsequently extreme weather events [1,[10][11][12].…”