Corrosive characteristics of bioethanol and gasoline blends for metals

Abstract

SUMMARYCorrosive characteristics of lignocellulosic bioethanol on metals, such as mild steel, copper, and aluminum were studied by static immersion test at room temperature. Effect of metals on degradation of fuel properties, such as pHe, total acid number, acidity, density, viscosity, calorific value, flash point, and color changes were evaluated. Moreover, the transformation of water content and oxidation products in the fuel were investigated. Effect of fuel blends on corrosion rate, chemical structure of metals, and morphology of corrosion product were also examined. Results showed that the corrosion of metals in E50 (50% bioethanol and 50% gasoline) is high compared with E25 and E0. Moreover, degradation of fuel properties and compositional changes in E25 and E50 were high compared with E0. The corrosion rate of aluminum in E50 (0.216 mpy) was lower than copper (0.441 mpy) and mild steel (0.487 mpy). Moreover, the corrosion rate of aluminum in E25 (0.096 mpy) was also lower than copper (0.285 mpy) and mild steel (0.297 mpy). It was discovered that corrosion of materials and degradation of fuel properties were 2.4 times high in higher ethanol blends (above E25) compared with lower ethanol blends (up to E25).

Corrosion Aggressiveness of Ethanol–Gasoline and Butanol–Gasoline Blends on Steel: Application of Electrochemical Impedance Spectroscopy

“…In contrast, great attention has been paid to ethanol−gasoline blends (EGBs) and their corrosion effects on metallic materials. 16−32 These corrosion studies have mostly been performed using gravimetric 18,20,31,32 and/or electrochemical 16,17,[22][23][24][25][26][27][28][29][30]33,34 methods. Gravimetric methods are based on the evaluation of the weight change (loss) of the tested materials caused by the corrosion process.…”

“…Gravimetric methods are based on the evaluation of the weight change (loss) of the tested materials caused by the corrosion process. 16,34 These methods are very simple, undemanding on the instrumental equipment, and provide accurate and reproducible results, but they are time-consuming as the typical testing period is in the order of weeks or months. 16 An example of the gravimetric method is the static immersion corrosion test, in which the weight change of the testing coupons is evaluated.…”

Improved Corrosion Resistance of Steel in Ethanol Fuel Blend by Titania Nanoparticles and Aganonerion polymorphum Leaf Extract

“…The corrosion of steel could be caused by the hygroscopic properties of ethanol, aggressive contaminants in bioethanol, and bacteria in the blend . To overcome this drawback, many manufacturers require supplement additives into biogasoline. − In recent years, the most widely used anticorrosive additives for gasoline are inhibitors including high-molecular-weight carboxylic acids, long-chain aliphatic amines, amine salts of carboxylic acids, and aliphatic polyamines and polyamides . These inhibitors have shown poor pitting corrosion resistance and some of them even affect human health, but they are still widely being used owing to the lack of good and environmentally friendly inhibitors .…”

A Study on Corrosion Inhibitor for Mild Steel in Ethanol Fuel Blend

“…Third, bacteria in the blend can produce some acids, salts or ammonia, acting as corrosive agents, which are responsible for microbial influenced corrosion. There have been many reports about corrosion of steel in petroleum pipelines and storage tanks being induced by ethanol fuel blend [ 5 , 6 , 7 , 8 ].…”