Investigating SDS Surfactant as a Corrosion Inhibitor for Carbon Steel in Hydrochloric Acid: Mechanisms and Efficacy
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The corrosion inhibition performance of sodium dodecyl sulfate (SDS) for carbon steel (CS) in 1 M hydro- chloric acid (HCl) environments was rigorously evaluated using potentiodynamic polarization techniques. This study explored efficacies of SDS at various concentrations and temperatures (20, 30, 40, and 50 oC) for inhibiting corrosion of CS. Findings demonstrated a notable anti-corrosion effect of SDS, with the max- imum inhibition efficiency reaching 70% at 20 oC. The adsorption behavior of SDS conformed to the Langmuir adsorption isotherm as indicated by high correlation coefficients. Computed standard adsorption free energy values suggested that both physisorption and chemisorption of SDS occurred on the CS sur- face. Surface analyses, including atomic force microscopy (AFM) and scanning electron microscopy (SEM), revealed the formation of a uniform protective layer, evidenced by smoother AFM images and reduced corrosion damage in SEM micrographs. A computational investigation using the PM3 method offered additional insights into the observed inhibition efficiencies, enhancing comprehension of the mech- anism of action of SDS invovled in inhibiting corrosion of CS.
Abstract
The corrosion inhibition performance of sodium dodecyl sulfate (SDS) for carbon steel (CS) in 1 M hydro- chloric acid (HCl) environments was rigorously evaluated using potentiodynamic polarization techniques. This study explored efficacies of SDS at various concentrations and temperatures (20, 30, 40, and 50 oC) for inhibiting corrosion of CS. Findings demonstrated a notable anti-corrosion effect of SDS, with the max- imum inhibition efficiency reaching 70% at 20 oC. The adsorption behavior of SDS conformed to the Langmuir adsorption isotherm as indicated by high correlation coefficients. Computed standard adsorption free energy values suggested that both physisorption and chemisorption of SDS occurred on the CS sur- face. Surface analyses, including atomic force microscopy (AFM) and scanning electron microscopy (SEM), revealed the formation of a uniform protective layer, evidenced by smoother AFM images and reduced corrosion damage in SEM micrographs. A computational investigation using the PM3 method offered additional insights into the observed inhibition efficiencies, enhancing comprehension of the mech- anism of action of SDS invovled in inhibiting corrosion of CS.