Investigation of modified layered double hydroxide nanocontainer as a corrosion inhibitor for carbon steel in acidic medium

Resumo

A modified layered double hydroxide (MLDH), was tested as a corrosion inhibitor for mild steel in 1 mol L^–1 HCl using electrochemical techniques. The inhibition efficiency was found to increase with increasing inhibitor concentration up to maximum 96.6% for 100 ppm at 30°C. The effects of temperature (35–65°C) on the inhibition of corrosion have also been investigated. The langmuir adsorption isotherm was found to provide the best explanation of the adsorption behavior of the investigated inhibitor on the mild steel surface. The calculated adsorption thermodynamic parameters reveal a physical adsorption of the inhibitors on the metal surface, endothermic process accompanied by an increase in entropy. Some samples of mild steel and MLDH particles were examined by SEM.