Effect of inert gases (pure nitrogen, nitrogen and carbon dioxide mixtures) on the corrosiveness of anhydrous ethanol (E100)

 Abstract

The objective of this work was to study the effect of inert gases (pure nitrogen, nitrogen and carbon
dioxide mixtures) on the corrosiveness of anhydrous ethanol (E100) through laboratory tests. Initially,
preliminary tests were conducted in order to establish the test conditions which showed that inerting
tests must be done in hermetic cells. After methodology establishment, seven E100 lots were tested.
The obtained results showed that different lots of N2 inerted E100 present different corrosiveness to carbon steel; CO2 injection in E100 provides an increase in its acidity, but this increase is not responsible for its corrosiveness; for nonaggressive N2 inerted E100, the presence of CO2 does not cause a deleterious effect; for aggressive N2 inerted E100, the presence of CO2 causes a slight intensification of corrosion (the more intense the corrosion, the higher the CO2 content in the inert gas); crevices enhance corrosion process of carbon steel by E100; the corrosion rate of carbon steel, even in aggressive N2 inerted E100, are negligible. Thus, for short-term inerting corrosion tests, the weight loss is not an adequate response for the evaluation of E100 aggressiveness. Detailed visual inspection and maximum pit depth determination are more prone for this purpose.


Reference
MOREIRA, A.R.; PIMENTA, G.S.; BRUGNELLI,R.A.; PANOSSIAN, Z.; OLIVEIRA,V.de. Effect of inert gases (pure nitrogen, nitrogen and carbon dioxide mixtures) on the corrosiveness of anhydrous ethanol (E100). In: NACE CORROSION 2011, Houston/Texas,2011. Proceedings..

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