Steel corrosion is a serious problem not only economically but also has a negative impact on our safety. In this report, the inhibitory efficiency of the synthetic chlorinated cyclic imide named f (CCIBA) on the corrosion of carbon steel (CS) in 1.0 M sulfuric acid solution was explored using different experimental and theoretical methods. Weight loss and electrochemical measurements were used to determine the inhibition efficacy (%IE) of CCIBA. The findings revealed that with the increase of CCIBA concentration, the corrosion rate omitted and the %IE value increased to 93%. While with the increase of temperature, the CS corrodes strongly. The higher values of %IE were proposed to be due to strong adsorption of the CCIBA molecules on the CS surface and such adsorption was mainly chemicalinits natureand wasconsistentwiththe Langmuiradsorption isotherms.Polarizationcurves revealed thatCCIBAbehaved as a mixed-type inhibitor. It was also shown that icorr values decreased sharply from 5930 to 417μA cm−2 with the addition of 29 × 10−6 M CCIBA. Impedance measurements demonstrated that raising the CCIBA concentration increased charge transfer. The coefficient values of kinetics and thermodynamics were calculated. Based on the data obtained, the inhibition mechanism was proposed. Computational predictions are in good agreement with experimental measurements.