The inhibition ability of two synthesized 8-quinolinol analogs namely, N-((8-hydroxyquinolin-5-yl)methyl)-4- methoxybenzamide (HMB), N-((8-hydroxyquinolin-5-yl)methyl) propionamide (HPA) toward C35E steel cor- rosion in 1 M HCl was studied by mass loss, electrochemical measurements, and theoretical calculations. The ex- perimental results indicated that 8-quinolinol analogs extremely enhanced the corrosion resistance of C35E steel in 1 M HCl, and the ηmax of HMB and HPA reached up to 93.5% and 89.3% at 10−3 M, respectively. Polarization studies indicated that 8-quinolinol analogs with amide-substituted work as mixed-type corrosion inhibitors. Electrochemical impedance spectroscopy (EIS) data proves that with the increase of temperature, both inhibitors keep their anti-corrosion performance. The adsorption of 8-quinolinol analogs with amide-substituted on the C35E steel surface was pursued the Langmuir isotherm. Theoretical density functional theory (DFT) calculations and molecular dynamics (MD) simulations gave corroborative results that are in agreement with experimental findings.