The study investigated the corrosion inhibition of α-brass in a 0.5 M H2SO4 solution, with the addition of polyethylene glycol (PEG4000) as an inhibitor. The corrosion inhibition was assessed utilizing weight loss and electrochemical polarization techniques. Fourier infrared spectroscopy (FTIR) was also employed to analyze polyethylene glycol. The different combined PEG concentrations gave excellent corrosion inhibition performance. The weight loss technique exhibited a substantial rise in inhibitory efficiency as the concentration of the inhibitor rose, reaching a maximum value of (49.19%) at 800 ppm. The thermodynamic values suggest that the adsorption process is spontaneous and takes place by physical adsorption, whereas the adsorption of the inhibitor approaches the Langmuir adsorption isotherm. The surface of the α-brass was examined utilizing a scanning electron microscope (SEM). Corrosion slowed because inhibitor molecules adsorp to its surface and formed a protective layer.