Inhibition Effect of 2-Amino, 5-Ethyl- 1, 3, 4 Thiadiazole on the Corrosion of Austenitic Stainless Steel Type 304 in Dilute Sulphuric Acid
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The inhibition effect of 2- amino, 5- ethyl- 1, 3, 4 thiadiazole (TTD) compound on the
corrosion of type 304 stainless steel in 3 M H2SO4 test solution was investigated using
potentiodynamic polarization, weight loss techniques and open circuit potential
measurements. Results showed TTD to be very effective with an average inhibition
efficiency of 98% from weight loss analysis and 87% from polarization test. Data from
open circuit potential measurement are well within passivation potentials at specific
concentrations of TTD. Scanning electron microscopy showed the effect of the
inhibiting compound on the surface topography of the steel, while X - ray
diffractometry determined the phase compounds formed on the surface due to inhibitor
adhesion. Adsorption of the compound was determined to obey the Langmuir isotherm
model. Thermodynamic calculations showed the inhibition process occurred through
chemisorption mechanism and results from statistical analysis revealed the
overwhelming influence of inhibitor concentration over exposure time on the inhibition
performance of the compound.
Keywords
T Technology (General), TJ Mechanical engineering and machinery