Application of thiazole and triazole compounds in carbon steel corrosion protection

Abstract

Inhibitory effect of 2-mercaptobenzothiazole (MBT) and 1,2,3-benzotriazole (BTA) on corrosion of carbon steel in 1.0 M HCl and seawater sample respectively has been studied using weight loss method. All measurements show that inhibition efficiencies of BTA and MBT increased with increase in inhibitor concentration and temperature in 1.0 M HCl and seawater sample. The results of the investigation show that the compound BTA and MBT have fairly good inhibiting properties with inhibition efficiencies of 98.24% for BTA and 92.98% for MBT in seawater sample while 87.49% for BTA and 30.15% for MBT in 1.0 M HCl, at 90 °C. Adsorption of these inhibitors follows the Langmuir adsorption isotherm. Thermodynamic adsorption parameters (Kads, Gads) of BTA and MBT were calculated using the Langmuir adsorption isotherm. The adsorptions of BTA and MBT on carbon steel are spontaneous processes in 1.0 M HCl and seawater sample, indicated by the negative values of Gads.