KINETICS STUDY ON CORROSION INHIBITION EFFECTS OF CASTOR SEED OIL ON MILDSTEEL PIPE

Offurum J.C.; Nwaneri T.U.; Chinagorom E.N.; Akuchie C.J. and Nwaozuzu S.C.

Department of Chemical Engineering,

Imo State Polytechnic, Umuagwo-Ohaji

E-mail: jullyengine@yahoo.com

Abstract

In this research work, the kinetics of corrosion inhibition effects of castor seed oil on mildsteel pipe was studied. This was in the bid to appreciate the significance of kinetic energy in the corrosion process. Corrosion inhibition assessment of the mildsteel material by the Castor Seed Oil (CSO) sample was conducted for varying dosages (of 50, 60 and 70% Strokes) per unit time at different concentrations (of 10, 15 and 20g/L), temperatures (of 40, 50 and 60^oC) within specified times (of 4, 8, 16, 24 and 32hours).  Kinetics study was conducted to evaluate the values of the kinetic parameters. The first order kinetic rate constant (k₁) was found to have all positive values, indicating that there is a continuous need for kinetic energy during the corrosion process. Also, the half life (t_1/2) values generally increases down the table, in the direction of increase in dozing rate. This suggests that higher strokes, per unit time, entering the system generate greater kinetic energy through greater (persistent) intermolecular bombardment of the fluid molecules. The values of coefficient of determination (R²) range from 0.7762-0.9854; this implies pa good data fit to the plots. However, the general trend in the values of the kinetic parameters (k and t_1/2) shows that corrosion rate increases with increase in the inhibitor concentration.