The Research of Thiosemicarbazide Modified as Acidizing Corrosion Inhibitor

Corrosion inhibition of N80 steel in 15% HCl was investigated in the absence and presence of different concentrations of some thiosemicarbazide derivatives (Mannich baseI, Mannich baseII) by weight loss, potentiodynamic polarization techniques. The adsorption of Mannich bases obeyed Langmuir adsorption isotherm. Both thermodynamic and activation parameters were calculated and discussed. The absorption process of Mannich base corrosion inhibitors on the surface of N80 steel is spontaneous, endothermic and entropy increase process. Polarization curves indicated that the inhibitor of Mannich bases are the mixed corrosion-controlling one which inhibited anodie corrosion. The results obtained from weight loss, Potentiodynamic polarization are in good agreement.