INHIBITIVE PROPERTIES OF ACETAMIDE AND THIOACETAMIDE ASINHIBITORS OF CORROSION OF MILD STEEL IN H SO SOLUTION

Moses Atondo
Department of Chemistry,
College of Education, Kastina-Ala

Abstract

There are several inorganic and organic inhibitors for corrosion control as well as techniques for corrosion monitoring. In this research, Acidimetric method, which is almost the simplest of all the techniques, was applied in the study of inhibitive properties of acetamide and thioacetamide as corrosion inhibitors of mild steel corrosion in 0.5 H SO solution for 7 h at the temperature range of 301 K to 313 K respectively. The results obtained were comparable with weight loss method of corrosion monitoring. The results obtained through acidimetric method showed better inhibition efficiency than that of the weight loss method. While the inhibition efficiency for thioacetamide at 500 ppm was found to be 66.99 % (the highest) that of acetamide at the same concentration was 57.77% (the highest). The inhibition efficiency for the two inhibitors was found to increase with increase in concentration but decrease with increase in temperature. Inferring from kinetic and thermodynamic parameter results, adsorption mechanism here was physisorption for both inhibitors which followed the adsorption isotherm models. It therefore means acidimetric method can be used in corrosion monitoring in acidic solution just like any other method or technique, as it is simple, fast and chances of having experimental errors are minimal.

Keywords: Corrosion, Acetamide, Thioacetamide, Acidimetric, Weightloss and Absorption Isotherms.