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10078 Corrosivity of Anhyddrous Etthanol, Hydrated Ethanol and Fuel E25 (25% Ethanol/75% Gasoline)

Picture for 10078 Corrosivity of Anhyddrous Etthanol, Hydrated Ethanol and Fuel E25
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Product Number: 51300-10078-SG
ISBN: 10078 2010 CP
Author: A Moreira, Z Panossian, C Santos, G Bragagnolo, M Gandur and E Monteiro
Publication Date: 2010
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The objective of the work was to study the corrosion of API 5LX 46 and API 5LX 65 alloys, used for pipelines, in anhydrous ethanol, hydrated ethanol and fuel E25 through laboratory immersion tests, NACE TM-0172 tests and dynamic tests (corrosion loops). Based on the results of this study, it was concluded that it is advisable that the internal surface of hydrated ethanol storage tanks be painted in order to avoid the corrosion of the internal walls which, despite being incipient, determines color changes which is unacceptable in the market. Furthermore, in pipelines used only for ethanol transportation, the painting of the internal walls of the tubes is not necessary because both the anhydrous ethanol and the hydrated ethanol are not aggressive to the steel, as long as the relative movement of the liquid is guaranteed. Finally, in pipelines used for ethanol and for petroleum derivatives transportation, it is advisable that the internal surfaces of these pipes be painted in order to avoid the contamination of the ethanol (anhydrous or hydrated) which makes the ethanol aggressive to the steel and changes its color (unacceptable in the market).

Keywords: biofuel, biofuel corrosivity, ethanol, E25, pipeline, storage tank.
The objective of the work was to study the corrosion of API 5LX 46 and API 5LX 65 alloys, used for pipelines, in anhydrous ethanol, hydrated ethanol and fuel E25 through laboratory immersion tests, NACE TM-0172 tests and dynamic tests (corrosion loops). Based on the results of this study, it was concluded that it is advisable that the internal surface of hydrated ethanol storage tanks be painted in order to avoid the corrosion of the internal walls which, despite being incipient, determines color changes which is unacceptable in the market. Furthermore, in pipelines used only for ethanol transportation, the painting of the internal walls of the tubes is not necessary because both the anhydrous ethanol and the hydrated ethanol are not aggressive to the steel, as long as the relative movement of the liquid is guaranteed. Finally, in pipelines used for ethanol and for petroleum derivatives transportation, it is advisable that the internal surfaces of these pipes be painted in order to avoid the contamination of the ethanol (anhydrous or hydrated) which makes the ethanol aggressive to the steel and changes its color (unacceptable in the market).

Keywords: biofuel, biofuel corrosivity, ethanol, E25, pipeline, storage tank.
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Stress corrosion cracking (SCC) of carbon steel in fuel ethanol service has been observed in an increasing number of failures in the last few years. In the presence of oxygen, all of the samples evaluated in this study produced varying degrees of SCC, except for one of the producer ethanol samples. The reason for the high corrosion potential in this sample is still unknown and more detailed analysis of the sample chemical make-up is needed.

 
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