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The corrosion of aluminum in 1.0 M HClO₄ was effectively controlled by a newly synthesized sulphated 8-hydroxy-quinoline derivative (8HQD), namely 2-(2-(quinolin-8-yloxy)acetamido)ethyl hydrogen sulfate. Rates of corrosion were monitored as a function of C_8HQD (C_8HQD: 10^− 4–10^− 2 M) using Tafel extrapolation method and linear polarization resistance (LPR) measurements. The electron density and corrosion-related defects in corroded and inhibited Al samples were probed using the positron annihilation lifetime (PAL) and positron annihilation Doppler broadening (PADB) techniques. Results were compared with 8-hydroxyquinoline (8HQ) itself. Polarization studies indicated that 8HQD acted as a mixed-type inhibitor with anodic predominance. PAS measurements demonstrated that the PAL components (τ_i) and their corresponding intensities (I_i) as well as PADB line-shape parameters (S and W) can be …