The inhibition effect of surfactant systems on the corrosion of carbon steel (AISI 1010) by 0.1 M hydrochloric acid (HCl) was investigated by polarization measurement techniques. Dodecylammonium bromide (DDAB) surfactant was used as a micellar solution in aqueous 0.1 M HCl and as an active component of a microemulsified oil-in-water system, containing n-butanol, n-hexane, and aqueous 0.1 M HCl. The adsorption of DDAB followed the Langmuir isotherm equation for both interfaces studied, and the largest βc was observed, in the cathodic range, when the concentration of the inhibitor was increased. The results obtained from electrochemical measurements were discussed, and it was observed that the microemulsion had a better inhibition effect than the pure surfactant solution.

Subject
Acids, Acid inhibitors, Steel surfaces, Adsorption, Surfactants, Solubility, Interfaces, Corrosion inhibitors, Steel, Oil, Carbon steel, Cathodic inhibitors, Anodic inhibitors
Keywords:
carbon steel, hydrochloric acid, inhibitors, microemulsion
NACE International
2002
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