Khaled J. Habib*, Weifeng Jiang, Amer N. Al-Arbeed, Aziz B. Rahman and Kenn T. Grattan Pages 74 - 82 ( 9 )
Background: A simple criterion for the efficiency evaluation of KGR-134 corrosion inhibitor of carbon steel samples in seawater solutions has been applied and compared with a numerical model along with a screening method of the percentage protection efficiency. The criterion, lim (ρins/ρs) =1, has been applied, when the resistivity of carbon steel sample in inhibited seawater (ρins) becomes equal to the resistivity of the carbon steel sample in blank seawater (ρs), as a function of the exposure time of the sample to the inhibited solutions. The criterion was used to determine the efficiency of 5-20 ppm of KGR-134 corrosion inhibitor in seawater.The analytical criterion, numerical modelling, and screening method of corrosion inhibitors were used in the present investigation. Efficiency variations of the KGR-134 corrosion inhibitor as a function of the inhibitor concentration and exposure time were calculated by fitting the experimental data to a numerical model incorporating a nonlinear regression method. The screening method of the percentage protection efficiency of corrosion inhibitors was found in a good agreement with the analytical criterion. Conclusions: The analytical criterion a long with numerical modelling were found concise ways of predicting the corrosion inhibitors efficiency of carbon steel in seawater in a comparison with the classical way of the screening method of corrosion inhibitors.
Corrosion inhibitor, electrical resistivity, carbon steel, numerical modelling, screening method of corrosion inhibitors.
Materials Science and Photo- Electronics Lab., RE Program, EBRO Center, KISR, P.O. Box 24885, Safat 13109, Electrical Engineering Department, Southeast University, Nanjing, Jiangsu, Materials Science and Photo-Electronics Lab., RE Program, EBRO Center, KISR, P.O. Box 24885, Safat 13109, Department of Electrical, Electronic and Information Engineering, City University London, Northampton Square, London EC1V 0HB, Department of Electrical, Electronic and Information Engineering, City University London, Northampton Square, London EC1V 0HB