TWO DERIVATIVES OF 7-AMINO-THIAZOLO[3,2-a]PYRIMIDINE AS INHIBITORS OF MILD STEEL CORROSION IN 1.0 M HCl SOLUTION: PART I: SYNTHESIS OF INHIBITORS AND ELECTROCHEMICAL STUDY.

The inhibiting power of two compounds of thiazolopyrimidine namely 7-amino-2-(p-tolyl)-2H-thiazolo[3,2-a] pyrimidine-3,5-dione (ATTP) and 7-amino-2-(4-chlorophenyl)-2H-thiazolo[3,2-a]pyrimidine-3,5-dione (ACTP) has been studied using electrochemical methods (potentiodynamic polarization and electrochemical impedance (EIS). It is observed that the inhibition efficiency increases with the increasing of the concentration for both studied inhibitors. Also, the maximum efficiency was obtained at 10-3M concentration. Potentiodynamic study indicates that ATTP acted as a mixed type with predominant cathodic, while ACTP acted as a cathodic inhibitor. The effect of the temperature was also studied in the temperature range 298 to 338 K. The results show that the inhibitory efficiency E (%) of ATTP and ACTP increases with the increasing of the temperature from 298 K to 318 K, then it decreases for a temperature higher than 318 K. [ABSTRACT FROM AUTHOR]