Corrosion protection of copper by self assembled nano film of 4-amino-3-(octadecylthio)-6-methyl-1,2,4-triazinone

Abstract

Self assembled monolayer (SAM) of 3-methyl-5-octadecylsulfanyl-[1,2,4]triazole-4-ylamine (MOSTY) was formed on the copper surface and the optimum conditions of formation of SAM were established. Corrosion behaviour of copper with the SAM was investigated in 0.02 M aq. HCl (acidic) and 0.02 M aq. NaCl (neutral) solutions. Weight-loss measurements, potentiodynamic polarization studies and electrochemical impedance studies were carried out in order to investigate the effect of MOSTY SAM on the corrosion protection of copper. Appropriate equivalent circuit models were used for impedance measurements of bare copper and the SAM covered copper in the chosen aggressive environments. These studies revealed the corrosion inhibition efficiency of SAM to an extent of 98% in 0.02 M aq. NaCl and 86% in 0.02 M aq. HCl environments.