Corrosion inhibition of Armco iron in 1 M HCl solution by alkyltriazoles

The efficiency of N-decyl, N-undecyl and N-dodecyl-1,2,4-triazole compounds as corrosion inhibitors of Armco iron, has been studied. Using weight loss, and polarization data it has been shown that the N-dodecyl-1,2,4-triazole product was the best inhibitor, which acts on the hydrogen evolution reaction. Potentiodynamic polarization experiments showed that corrosion rate in presence and absence of N-dodecyl-1,2,4-triazole increases with increasing temperature from 30 to 60 degreesC. The corresponding activation energies were determined. The high inhibition efficiency was obtained at 50 degreesC in presence of 10(-3) M of N-dodecyl-1,2,4-triazole. The effect of pH was examined from 0 to 3 values and the inhibiting effect decreases when pH value become higher than 2. (C) 2002 Elsevier Science Ltd. All rights reserved.