Abstract
Abstract The inhibition of zinc corrosion by various triazole derivatives was investigated with respect to dependence on pH, potential E , inhibitor concentration c Inh , zinc ion concentration c Zn 2+ , and exposure time t . Current potential curves and measurements of weight loss show that 3-amino-5-heptyl-1,2,4-triazole (AHT) is an excellent inhibitor of zinc corrosion in acid and weak alkaline solutions, while bisaminotriazole (BAT4) gives the best inhibition efficiency expecially at pH 9 and low inhibitor concentrations. Capacity potential curves and XPS-measurements show the formation of protective triazole layers with a maximum thickness of about 3 nm. The chemical analysis of insoluble zinc triazole complexes precipitated in solution yields a stoichiometric ratio of Zn 2+ and the triazole ring of 1 : 2. The presence of zinc triazole complex on the zinc surface is shown by XPS spectroscopy. The solubility, adsorbability and hydrophobicity of the triazole molecules and the stability of the zinc-triazole complexes are found to be the most important factors influencing the inhibition efficiency of the triazole derivatives under varying conditions.
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