Inhibiting effect of thiosemicarbazide on cold rolled carbon steel

Abstract

The inhibitive effect of thiosemicarbazide on the corrosion of cold rolled carbon steel in acidic media has been studied. For this investigation, a standard potentiodynamic polarisation technique was used to determine the corrosion rate and the inhibition efficiency and also to find out which adsorption isotherm governs the inhibition process. For this purpose, thiosemicarbazide was added to 0·5M H2SO4 in four concentrations ranging between 1 × 10−4M and 1 × 10−2M. Analysis of the experimental data shows that concentration has a strong influence on the efficiency of inhibition. Thermodynamics studies confirm that the inhibitor adsorption follows the Langmuir adsorption isotherm.