Impacts from ditiocarb sodium trihydrate inhibitor on corrosion of the carbon steel in saturated-CO2 and deaerated 0.5 M H2SO4 acidic solution has been studied using potentiodynamic polarization and open circuit potential procedures. The conclusion suggests that redundancy effectiveness of the evaluated ditiocarb sodium trihydrate compound depends on the concentration and the nature of the corrosive media: the corrosion current density (icorr) decreases with incrementing ditiocarb sodium trihydrate inhibitor concentration. Increasing the ditiocarb sodium trihydrate concentration leads not only to an increase in the efficiency of the inhibitor, but a reduction in the rate of corrosion. The corrosion potential becomes slightly more positive. Polarization results indicate that this compound behaves as a mixed-type inhibitor and it works best in deaerated, acidic media. On the basis of the data, ditiocarb sodium trihydrate is recommended for use as an effective inhibitor.