Three six-amino pyrimidine derivative chemicals were recently identified; P(3), 2-mercaptopyrimidin-4-ol, P(5), (E)-6-(benzylideneamino)-2-mercaptopyrimidin-4-ol, and P(6), (E)-Ethyl-2-{[(4-(benzylideneamino)-6-hydroxypyrimidin-2yl) thio]}acetate. FTIR and 1H NMR provided confirmation of the synthesized substance's chemical structure. The newly synthesized cationic pyrimidine derivatives were investigated for their potential as carbon steel corrosion inhibitors in acidic solutions via impedance and potentio-dynamic polarization spectra. The inhibitory efficiencies derived from the several methods used are largely in line with one another. The Tefel findings demonstrated that the compounds effectively prevented carbon steel from corroding under the examined corrosive conditions, with an inhibition efficacy of 78.21, 78.74 and 81.37%, for P(3), P(5) and P(6), respectively. Using the Frumkin isotherm, it was determined that these chemicals' inhibitory impact was related to their adsorption on carbon steel surface. The surface of the carbon steel was inspected with SEM.