The Inhibitory Properties of the Ambroxol Derivative on the Corrosion of Mild Steel in Hydrochloric Acid Medium

Figure 3

The IR and Raman spectra: 1: IR spectrum of ambroxol hydrochloride; 2: IR spectrum of ambroxol free base; 3: IR spectrum of 2-(6,8-dibromo-3-(4-hydroxycyclohexyl)-1,2,3,4-tetrahydroquinazolin-2-yl)phenol; 4: Raman spectrum of 2-(6,8-dibromo-3-(4-hydroxycyclohexyl)-1,2,3,4-tetrahydroquinazolin-2-yl)phenol.