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Iron dissolution in aqueous AOT solution.

I L Lehr1, S B Saidman, P C Schulz

  • 1Instituto de Ingeniería Electroquímica y Corrosión (INIEC), Departamento de Ingeniería Química, Universidad Nacional del Sur, Av. Alem 1253, 8000 Bahía Blanca, Argentina.

Journal of Colloid and Interface Science
|November 28, 2006
PubMed
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Sodium bis(2-ethylhexyl) sulfosuccinate (AOT) initiates iron dissolution on passivated surfaces, forming a unique gel-like film. This film, a lamellar mesophase, was characterized using various electrochemical and spectroscopic methods.

Area of Science:

  • Electrochemistry
  • Materials Science
  • Corrosion Science

Background:

  • Iron's electrochemical behavior is crucial in many industrial applications.
  • Understanding surface interactions with surfactants like AOT is key to controlling corrosion.
  • Passivation layers on iron can be altered by specific chemical agents.

Purpose of the Study:

  • To investigate the electrochemical effects of sodium bis(2-ethylhexyl) sulfosuccinate (AOT) on iron.
  • To elucidate the mechanism of AOT-assisted iron dissolution.
  • To characterize the corrosion products formed in the presence of AOT.

Main Methods:

  • Potentiodynamic and potentiostatic polarization techniques.
  • Open-circuit potential measurements.

Related Experiment Videos

  • Electrochemical analysis coupled with microscopy (polarizing, SEM/EDX) and spectroscopy (IR).

    • Main Results:

    • AOT initiates iron dissolution from a passivated surface.
    • Oxidation current leads to the formation of a gel-like film.
    • The film is identified as a mixed NaAOT-Fe(AOT)3 lamellar mesophase.

    Conclusions:

    • AOT plays a significant role in the electrochemical dissolution of iron.
    • A proposed structure for the NaAOT-Fe(AOT)3 lamellar mesophase was determined.
    • The findings provide insights into surfactant-induced corrosion mechanisms.