Abstract
The corrosion behavior of pure aluminum (Al) in 20 v/v% ethanol–gasoline blends has been studied using electrochemical techniques. Ethanol was obtained from different fruits including sugar cane, oranges, apples, or mangos, whereas other techniques included lineal polarization resistance, electrochemical noise, and electrochemical impedance spectroscopy for 90 days. Results have shown that corrosion rates for Al in all the blends were higher than that obtained in gasoline. In addition, the highest corrosion rate was obtained in the blend containing ethanol obtained from sugar cane. The corrosion process was under charge transfer control in all blends; however, for some exposure times, it was under the adsorption/desorption control of an intermediate compound. Al was susceptible to a localized, plotting type of corrosion in all blends, but they were bigger in size and in number in the blend containing ethanol obtained from sugar cane.
Highlights
Engines that use gasoline and alcohol as renewable energy sources have gained relevance lately and have been the subject of intense research studies all over the world
Al was highly susceptible to a localized type of corrosion, such as plotting, in all the ethanol–gasoline blends blends regardless regardless of of the the ethanol ethanol source
Al could could develop develop aa mixture mixture of of localized localized and and uniform uniform type type of of sugar sugar cane, these results indicated that Al could develop a mixture of localized and uniform type corrosion
Summary
Engines that use gasoline and alcohol as renewable energy sources have gained relevance lately and have been the subject of intense research studies all over the world. Evaluated the corrosion behavior of four metals, including pure aluminum, chromium steel carbon steel, and copper in a 20% ethanol-80–gasoline blend using both weight loss and electrochemical impedance spectroscopy. They found that carbon steel and copper exhibited a greatest corrosion rate. Yoo et al studied the corrosion behavior of A384 aluminum alloy in bio-ethanol blended gasoline with
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