DEVELOPING LOCAL RAW MATERIALS AS CORROSION INHIBITORS FOR DRILL-PIPE CORROSION
M. Alagbe & G. O. Olajide
Department of Metallurgical Engineering Institute of Technology
Kwara State Polytechnic, Ilorin Nigeria.
Email: alagbemic@yahoo.com
Abstract
This report presents the investigation of red onion skin and the plant Rhizophoraracemosa as inhibitors of corrosion of samples of NST60-2 drill-pipe in drilling mud solution using the weight-loss immersion technique. The inhibitive potentials of the two inhibitors were evaluated based on a determination of the corrosion rates in the presence and absence of the inhibitors and effectiveness of the two inhibitors at different levels of concentrations for room temperature of 28oC and elevated temperature of 125oC. The results show that red onion skin is a much better inhibitor of the corrosion of samples of drill-pipe in drilling mud solution than the plant Rhizophoraracemosa. The effectiveness of inhibition becomes significant only at concentrations of 200ppm for red onion skin and 300ppm for the plant Rhizophoraracemosa at room temperature. At elevated temperature, the effectiveness of their inhibition is not reliable because a greater amount of inhibitor may be required for the protection of oil processing equipment and machineries. The results of this work are expected to be used to improve the corrosion resistance of this drill-pipe for oil processing industries in Nigeria.