Inhibition of corrosion of brass in acid medium

The effect of 1,24-triazole derivatives such as 3-amino- 1,2,4-triazole (ATA), 3-amino-5-mercapto- 1,2,4-triazole (AMT) and 3-amino-5-methylthio-1,2,4-triazole (AMTT) and ionic surfactants like cetyl trimethyl ammonium bromide (CTAB) and sodium dodecyl sulfate (SDS) on the corrosion of a-brass admiralty brass in an aqueous acidic solution (pH 2) of potassium hydrogen phthalate and hydrochloric acid is evaluated. The influence of combinations of triazoles and surfactants has also been studied. The techniques used were gravimetric measurements, polarization studies, cyclic voltammetric studies and solution analysis. AMTT and SDS have a large influence on the corrosion of admiralty brass. These compounds chemisorb on the brass surface according to the Langmuir isotherm. The effect of temperature on the corrosion rate was investigated and activation energies were calculated. The leaching characteristic of brass was evaluated by AAS. The action of the combinations of inhibitors and surfactants is proposed as synergism effect.