2-Amino-5-(4-pyridinyl)-1,3,4-thiadiazole film at the silver surface: Observation by Raman spectroscopy and electrochemical methods

► 2-Amino-5-(4-pyridinyl)-1,3,4-thiadiazole (4-APTD) as anticorrosive reagent. ► Adsorption of 4-APTD at the silver surface via N12, S1 and C2 atoms to form film. ► Inhibition efficiency of silver with 4-APTD film is of 89.5% in 0.1 M KCl solution.