Mild steel has been utilized in a variety of applications, including reaction vessels, tanks, and other structures, however the fundamental issue with this material is that it is quickly impacted by corrosive solutions. We tried to solve this problem by producing new inhibitors. From the interaction of benzoic acid derivatives and aminoacetophenone with various quinazoline derivatives, a range of amido carboxylic acids have been produced. The corrosion inhibition capabilities of the novel compounds for mild steel corrosion in HCl solution were examined. The results of these techniques showed that increasing the concentration of inhibitor and reducing the temperature boosted inhibition efficiency. From data acquired at various temperatures, some thermodynamic parameters were derived and discussed for the examined systems. Using 1000 ppm of the newly synthesized derivative, around 94 percent inhibitory efficiency was determined. According to the polarization data, the newly synthesized compounds exhibit a mixed inhibitory effect. The Langmuir isotherm was determined to be the best fit for representing the inhibitor's adsorption behavior.