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Inhibition performance of purpald (4-amino-3-hydrazino-5-mercapto-1,2,4-triazole (AHMT)) was investigated as a corrosion inhibitor for a copper surface in 2 M HNO3 at 303 K by weight loss, ac impedance, and dc polarization techniques. The obtained results indicate that AHMT is a good inhibitor and its inhibition efficiency attains 94.7% at 10–2 M. Polarization studies showed that AHMT acts as a mixed type inhibitor. The inhibitor adsorption process in the Cu/AHMT/2 M HNO3 system was studied at different temperatures (303–343 K). The adsorption of AHMT on the copper surface obeyed Langmuir’s adsorption isotherm. The kinetic and adsorption parameters for copper/acid in the presence and absence of AHMT were evaluated and discussed.

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