CATHODIC PROTECTION OF CARBON STEEL IN 0.1N NaCl SOLUTION UNDER FLOW CONDITIONS USING ROTATING CYLINDER ELECTRODE
Main Article Content
Abstract
The effect of applied current on protection of carbon steel in 0.1N NaCl solution (pH=7) was investigated under flow conditions (0-0.262 m/s) for a range of temperatures (35-55°C) using rotating cylinder electrode. Various values of currents were applied to protect steel from corrosion, these were Iapp.=Icorr., Iapp.=2Icorr. and Iapp.=2.4Icorr. under stationary and flow conditions. Corrosion current was measured by weight loss method. The variation of protection potential with time and rotation velocity at various applied currents was assessed. It is found that the corrosion rate of carbon steel increases with rotation velocity and
has unstable trend with temperature. The protection current required varies with temperature and it increases considerably when the rotation velocity was increased. The protection potential decreases appreciably (shifts to more negative) with time and with increasing rotation velocity. Also it shifts to more positive with increasing temperature.
Article Details
Section
How to Cite
References
Al-Mashta S.E., M.Sc Thesis, Chem. Eng. Dept., AlNahrain University, Baghdad, 1996.
Atia M. A., Ph. D. Thesis, Dept. Chem. Eng., AlNahrain University, Baghdad, 1996.
Audin A., and L.John, J. Chem. Eng. Data, Vol. 17,No.3, p.789, 1972.
Barhai B & P.K.Gogoi, "Corrosion Inhibition of Carbon Steel in Open Recirculation Cooling Water System of Petroleum Refinery by A multicomponent Blend Containing Zinc (II) Diethyldithiocarbmate", Indian Journal of Chemical Technology, Vol. 17, PP. 291-295, July 2010.
Bentur, Arnon, Diamond, Sidney and Berke, Neal S., " Steel Corrosion in Concrete", E and FN Spon, New York, NY. PP.201, 1997.
Brodkey R. S. and H. C. Hershey, Transport Phenonmena, 2nd Printing, Mc Graw Hill, New York, 1989.
Enos, D.G., Williams, A.J.Jr. and Scully, J.R., "Long-Term Effects of Cathodic Protection on Prestressed Concrete Structures: Hydrogen
Fahien R. W., Fundamentals of Transport Phenomena, McGraw Hill, NY, 1983.
Fontana M.G. and N. D. Greene, " Corrosion Engineering", 3rd edition McGraw- Hall, 1986.
Foroulis Z. A., Corrosion, Vol. 35. P.340, 1979.
Gabe D.R. and P.A. Makanjoula, EFCF Publication Series No. 15, Electrochemical Eng.,AICHE Symposium Series, No. 98, P.309, 1986.
Hasan, B.O., "Heat, Mass and Momentum Analogies to Estimate Corrosion Rates under Turbulent Flow Conditions", Ph. D. Thesis. Chem. Eng. Dep., AlNahrain University, Baghdad, 2003.
Henry S.D and W.M. Scott " Corrosion in the Petrochemical Industry", 1st edition , ASM International, USA, 1999.
Kim Y.J., GE Research and Development Centre, Technical Formation Series, 97CRD 202, Feb.1998.
Konsowa A.H.and A.H El-Shazly, " Rate of Zinc Consumption During Sacrifical Cathodic Protection of Pipelines Carrying Saline Water", Desalination Vol. 153, pp. 223-226, 2002.
Mahato, B. K., F. R. Steward, and L. W. Shemlit, Corrs. Sci. Vol. 8, P. 737, 1968.
Mahato, B. K., C. Y. Cha, and W. Shemilt. Corros. Sci., Vol. 20, P. 42, 1980.
Nesic N., B. F. M. Pots, J. Postelthwaaite, and N.Trevenot, J.Corrosion Science and Eng., Ph.D.Study, Vol. 1, Paper 3, 1995.
Perez Nestor "Electrochemistry and Corrosion Science", 2004.
Pickett D.J. and K.L. Ong, Electrochmical Acta, Vol.19, p. 875, 1974.
Roberge Pierre R., "Corrosion Engineering Principles and Practice", McGraw-Hall, 2008.
Ross T.K., G.C. Wood and I.J. Mahmud, Electro chem. Soc., Vol.113, P.334, 1996.
Sami, A.A. and A. A. Ghalib, "Variable Conditions Effects on Polarization Parameters of Impreesed Current Cathodic Protection of Low Carbon Steel Pipes', Eng. Technol. J. Vol. 26, PP. 1-12, 2008.
Embrittlement of Prestressing Steel", Corrosion, Vol 53, No. 11, PP. 891-908, Nov. 1997
Scantlebury J.D. Dae Kyeong Kim, Srinivasan Muralidharan, Tae Hyun Ha, Jeong Hyo Bae, Yoon Cheol Ha and Hyun Geo Lee, " Electochemical Studies on the Alternating Current Corrosion of Mild Steel Uner Cathodic Protection Condition in Marine Environments", Electrochimica Acta, Vol 51. PP.5259-5267, 2006.
Sense F., Oxygen Solubility, North California State,2001.
Shreir L.L., Corrosion Handbook, 2nd edition, part 1,Newnes Butter, London, 1976.
Shreir L.L., Corrosion Handbook, 2nd edition, part 1,Newnes Butter, London, 2000.
Slaiman and Hasan, "Study on Corrosion Rate of Carbon Steel Pipe under Turbulent Flow Conditions", The Candian J. of Chem. Eng., Vol. 88, December, 2010.
Smith S. W., K.M. McCabe, and D. W. Black 'Effect of Flow Parameters on the Cathodic Protection of A steel Plate in Natural Seawater", Corrosion, October 1989
Steigerwald R.F., Corrosion-NACE, P. 1, 1968.
Uhlig H.H., "The Corrosion Hand book", John Wiley & Sons, New York, 1976.
Uhlig, R., Herbert H. Winston Revie "Corrosion and Corrosion Control, An Introduction to Corrosion Science and Engineering", 4rd edition John Wiley &Sons, 2008.
Virmani, Yash Paul and Clemena, Gerardo G.,"Corrosion Protection-Cocrete Bridges", Report No.FHWA-RD-98.088,Fedral Highway Administration,Washington, D.C., 1998
Welty J. R., C. E. Wicks, and G. Rorrer,"Fundamental of Momentum, Heat and Mass Transfer, 4th edition, John Wiley and Sons, United State of America, 2001.