Stress corrosion tests of 5L X70 steel in ethanol medium

Abstract:

The objective of this study was to evaluate the stress corrosion of steel API 5L-X70 in ethanol media from diverse origins: PA anhydrous ethanol, ethanol from sugar-cane (different lots of a refinery), and corn ethanol. In the trials were used samples with V-notch under reduced slow-strain-rate (1.0 x 10-5 mm s-1), and ultrapure nitrogen and super dry synthetic air atmospheres. Fractures of the specimens were characterized by scanning electron microscopy (SEM). The simultaneous analysis of the curve load (kgf) versus extension (%) and the fracture micrographs showed the following as the SC: 1) anhydrous ethanol behaves as an inert; 2) ethanol from sugar cane exhibits a slight aggressive action, particularity for synthetic air atmosphere; 3) corn ethanol quite aggressive in synthetic air atmosphere


Reference:
SANTOS, Célia Aparecida de Lino; JOAQUIM, Antonio C.; SANTOS, José V.S. dos; FLOR, Juliana P.; SANTOS JR., Horácio Oliveira; PANOSSIAN, Zehbour; PIMENTA, Gutemberg de S. Ensaios de corrosão sob tensão do aço API 5L X70 em meio etanol = Stress corrosion tests of API 5L X70 steel in ethanol medium. Corrosão Protecção e Materiais, v. 32, n. 1, p. 19-23, 2013.


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