Herein, Two new acridin-pyrazole Schiff bases, (E)-2-phenyl-5-propyl-N-(1,2,3,4-tetrahydroacridin-9-yl)-2,4- dihydro-3H-pyrazol-3-imine (APS-1) and (E)-5-(methoxymethyl)-2-phenyl-N-(1,2,3,4-tetrahydroacridin-9-yl)- 2,4-dihydro-3H-pyrazol-3-imine (APS-2), were synthesized and their anticorrosion activities for carbon steel (CS) were evaluated in 1 M HCl solution. Atomic Force Microscopy (AFM), mass loss (ML), potentiodynamic polarization (PDP) and electrochemical impedance measurement (EIS) were used to investigate their surface, and inhibition performance (η %). ML measurements of APS-1 and APS-2 (5 mM) showed η% values of 93.3% and 95.0% at 298 K, respectively. Adsorption studies confirmed that they have physical-chemical interactions and obeyed the Langmuir model. PDP measurements showed that they had a mixed nature. EIS experiments revealed that they increased the resistance of CS to charge transfer while simultaneously reducing the double layer capacitance. Theoretical calculations using density functional theory (DFT) and molecular dynamics (MD) simulation were also performed to investigate the adsorption patterns of the synthesized compounds on the Fe (110) surface. The mechanism of inhibition is proposed and elucidated. The experimental measurements were in complete agreement with the theoretical predictions.