Theoretical and experimental evaluation of the inhibiting power of 4-amino,5-phenyl-1,2,4-triazole,3-thione against corrosion copper in a neutral chloride environment

In this study, we first developed the synthesis of 4-amino-5-phenyl-1,2,4-triazole-3-thione (APTS) and then its identification based on 1H and 13C NMR spectral data.  The product's ability to prevent copper corrosion in a 3% NaCl solution was then evaluated. This work was carried out by stationary and transient electrochemical techniques, supplemented by a theoretical study. The results obtained showed that the APTS provides good protection of copper in the corrosive environment by the formation of a protective layer adsorbed on the metal surface. The inhibitory efficiency achieved is around 98% for a concentration of 10-3M in inhibitor justifying its protective effect. The theoretical study of the interaction of APTS with metallic copper shows that this inhibitor adsorbs on the metallic surface by forming chemical bonds between the metal and the inhibitor. This confirms the experimental result