Dimethyl sulphide, more often known as DMS, acts as a corrosion inhibitor when applied to 0.5N mild steel. This property of DMS allows it to be used in this context. The mass loss method at room temperature is utilized as the major testing approach for analyzing hydrochloric acid. This technique is used to determine the concentration of the acid. The effectiveness of an inhibitor in preventing corrosion is proportional to the amount of that inhibitor present in the system. The corrosion pace may be slowed by raising the inhibitor's concentration in the system. Raising the concentration of the inhibitor solution on the surface of the mild steel makes it possible to prevent the creation of a protective layer on the surface of the mild steel, which would otherwise obstruct the active site. Electrochemical tests on mild steel, such as AC impedance and polarisation, have been performed to determine whether or not a protective coating has developed on the material. These tests aim to determine whether or not a coating has formed. Researchers working in the field of electrochemistry have found that using Fourier transform infrared spectroscopy has been beneficial to their work (FTIR). In order to conduct our studies on polished, corroded, and inhibitor-treated mild steel surfaces, a scanning electron microscope and an energy dispersive x-ray analyzer were used (EDAX). The surface's roughness and smoothness can be seen in the AFM micrographs.