Vol. 30 No. 1 (2017): Revista ION
Article of scientific and technological research

Effect of carbonate chemical speciation on crevice corrosion of nickel superalloy

Mauricio Rincón Ortiz
Universidad Industrial de Santander
Martín Alejandro Rodríguez
Comisión Nacional de Energía Atómica, Instituto Sabato
Ricardo Mario Carranza
Comisión Nacional de Energía Atómica, Instituto Sabato

Published 2017-06-30

Keywords

  • Alloy 22,
  • Crevice corrosion,
  • carbonate chemical speciation,
  • cloruros,
  • repassivation potential,
  • PD-GS-PD
  • ...More
    Less

How to Cite

Rincón Ortiz, M., Rodríguez, M. A., & Carranza, R. M. (2017). Effect of carbonate chemical speciation on crevice corrosion of nickel superalloy. Revista ION, 30(1), 7–19. Retrieved from https://revistas.uis.edu.co/index.php/revistaion/article/view/6592

Abstract

The inhibitory effects of carbonate chemical species on the susceptibility of crevice corrosion of the alloy 22 in chloride solutions were studied. In this work electrochemical techniques such as Anodic Polarizations Curves and Potentiodynamic-Galvanostatic-Potentiodynamic (PD-GS-PD), Electrochemical Impedance Spectroscopy and Scanning Electron Microscopy (SEM) were applied to determine the passive behavior of the alloy in the presence of these species. Results indicated that carbonic acid and bicarbonate not showed inhibitory effects on the conditions studied. Carbonate presented a critical molar ratio R =[CO=3]/[Cl-] = 1 independent of the chloride concentration. The presence of an anodic peak was found, related with carbonate concentration. The corrosion rate obtained were less than 0.4μm/year at 24h of immersion.

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