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09536 Pitting Corrosion of Carbon Steel in Fuel Grade Ethanolic Environment

Picture for 09536 Pitting Corrosion of Carbon Steel in Fuel Grade Ethanolic Environment
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Product Number: 51300-09536-SG
ISBN: 09536 2009 CP
Author: Lindsey R. Goodman, Xiaoyuan Lou and Preet M. Singh
Publication Date: 2009
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Preliminary results have shown that the carbon steel is susceptible to pitting corrosion in certain ethanol environments. Immersion tests, cyclic polarization tests, and electrochemical impedance measurements were carried out on X-65 carbon steel specimens in various ethanol-water environments by adjusting the composition in simulated fuel grade ethanol (FGE) mixture. FGE solutions with 5% to 10% water concentration strongly promoted both the general corrosion as well as the pitting corrosion on pipeline steel. Pit size and density was found to change with the amount of water in these chloride containing FGE solutions. Amount of acetic acid in FGE did not show significant effect on the pitting tendency; however, small amounts of hydroxide addition stopped pitting of carbon steel in FGE.

Keywords: pitting corrosion, ethanol, fuel grade ethanol, carbon steel, pipeline steel
Preliminary results have shown that the carbon steel is susceptible to pitting corrosion in certain ethanol environments. Immersion tests, cyclic polarization tests, and electrochemical impedance measurements were carried out on X-65 carbon steel specimens in various ethanol-water environments by adjusting the composition in simulated fuel grade ethanol (FGE) mixture. FGE solutions with 5% to 10% water concentration strongly promoted both the general corrosion as well as the pitting corrosion on pipeline steel. Pit size and density was found to change with the amount of water in these chloride containing FGE solutions. Amount of acetic acid in FGE did not show significant effect on the pitting tendency; however, small amounts of hydroxide addition stopped pitting of carbon steel in FGE.

Keywords: pitting corrosion, ethanol, fuel grade ethanol, carbon steel, pipeline steel
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