Corrosion inhibition of aluminum alloy in HCl by SDS: experimental, SEM/AFM imaging, and computational insights (DFT and MD simulations).

contextThe surfactant sodium dodecyl sulfate (SDS) has been investigated for aluminum (Al) corrosion inhibition in 0.2-0.4 M hydrochloric acid (HCl) employing mass loss (ML), electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization (PDP) techniques. The inhibition efficiency (IE) of SDS was found to be concentration-dependent, with a maximum of 97% at 8 mM, which was attributed to the presence of long-chain groups. Notably, the highest inhibition efficiencies were recorded at an inhibitor concentration of 8 mM in a 0.2 M HCl solution at 303 K, achieving 97.76% via the gravimetric method, 97.30% through PDP, and 93.72% using EIS analysis. The temperature variation from 303 to 333 K showed that higher SDS concentrations improved the degree of inhibition, whereas higher temperatures reduced the degree of effectiveness. Polarization measurements indicated that SDS exhibited a cathodic inhibition mechanism. A double-layer capacitance (C

methodsCorrosion resistance of aluminum in SDS-acidic environments was investigated using PDP and EIS methods. Experiments utilized a three-electrode system in which only a 1-mm