Study of the Effect of Fluid Flow on Corrosion Rate for Simple Carbon Steel in Aqueous Solution Using Rotating Disk Electrode

Document Type : Research Article

Authors

1 Department of Chemical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, P.O. Box 9177948944 Mashhad, I.R. IRAN

2 Department of Chemical & Petroleum Engineering, Sharif University of Technology, P.O. Box 11365-9465 Tehran, I.R. IRAN

Abstract

 Corrosion means the destruction or the deterioration of materials because of reaction with its environment. One of important effective factors on corrosion rate is fluid motion in pipe and all of construction that have flow of fluid. This study was carried out to investigate the effect of fluid flow on the corrosion of simple carbon steel ST37 (AISI 1020) in aqueous solution of Bandar Abbas’s gas well at 25oC under the air-saturated condition. To investigate the mechanism and kinetic of corrosion in different hydrodynamic conditions, a Rotating Disk Electrode (RDE) was used. The imposed potential and polarization on the metal sample, a potentiostat system was utilized and to interpret the data, Linear Polarization Resistance (LPR) and tafel polarization methods were applied. To study the effect of fluid flow on the rate of corrosion, the speed of rotating disk was changed from 100 to 1700 rpm. Drawing the related polarization curves mass transfer coefficients were predicted. Using these coefficients and empirical correlation between dimensionless groups as Sh= 0.8433 Re0.497Sc1/3 was found. This correlation is much closer to the correlation proposed by Levich. Experimental data also shows that increasing the disk speed to 1000 rpm. The rate of corrosion (due to the increases in mass transfer rate) was increased. Above this speeds the rate of corrosion in independent of disk speed. Finally to study the corrosion inside the pipes using the analogy aspects, a relation to predict the disk speed (generating the same velocity of fluid inside the pipe) was obtained.

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References

[1] Fontana M.G., "Corrosion Engineering", Tata McGraw-Hill Education (2005).
[2] Revie R.W., Uhlig H.H., "Corrosion and Corrosion Control", Fourth ed.: John Wiley. 496 (2008).
[3] Philip A., Schweitzer P.E., "Corrosion of Linings & Coatings: Cathodic and Inhibitor Protection and Corrosion Monitoring", Taylor & Francis (2006).
[4] Saremi M., Dehghanian C., Sabet M.M., The Effect of Molybdate Concentration and Hydrodynamic Effect on Mild Steel Corrosion Inhibition in Simulated Cooling Water, Corrosion Science, 48(6): p. 1404-1412 (2006).
[5] De Sanchez S., Schiffrin D., The Use of High Speed Rotating Disc Electrodes for the Study of Erosion-Corrosion of Copper Base Alloys in Sea Water, Corrosion Science, 28(2): p. 141-151 (1988).
[6] Magaino S., Corrosion Rate of Copper Rotating-Disk-Electrode in Simulated Acid Rain, Electrochimica Acta, 42(3): p. 377-382 (1997).
[7] Boto K.G., Williams L.F., Rotating Disc Electrode Studies of Zinc Corrosion, Journal of Electroanalytical Chemistry and Interfacial Electrochemistry,77(1): 1-20 (1977).
[8] Caprani A., Epelboin I., Morel P., Potentiostatic Investigation of the Evolution of the Cathodic Current, Near the Corrosion Potential, of a Titanium Rotating Disc Electrode in Aerated Sulphuric Acid Medium, Journal of the Less Common Metals, 69(1):  37-48 (1980).
[9] Han S. et al., Rotating Minidisk-Disk Electrodes, Electrochemistry Communications, 9(7): 1434-1438 (2007).
[10] Kreith F., Convection Heat Transfer in Rotating Systems, Thomas F.I., James P.H., (Editors), In: "Advances in Heat Transfer, Elsevier. p. 129-251 (1969).
[11] Kreith F., Taylor J., Chong J., Heat and Mass Transfer from a Rotating Disk, Journal of Heat Transfer, 81: 95-105 (1959).
[12] LaQue F.L., Theoretical Studies and Laboratory Techniques In Sea Water Corrosion Testing Evaluation, Corrosion, 13(5): 33-44 (1957).
[13] Levich V.G., "Physicochemical Hydrodynamics", Prentice-Hall Englewood Cliffs, NJ, Vol. 689. (1962).
[14] Stern M., Geary A.L., Electrochemical Polarization I. A theoretical Analysis of the Shape of Polarization Curves, Journal of the Electrochemical Society, 104(1): 56-63 1957.
[15] Evans S., Koehler E., Use of Polarization Methods in the Determination of the Rate of Corrosion of Aluminum Alloys in Anaerobic Media, Journal of the Electrochemical Society, 108(6): 509-514 (1961).
[16] Ellison B.T., Cornet I., Mass Transfer to a Rotating Disk, Journal of the Electrochemical Society, 118(1): 68-72 (1971).
[17] Vahdat N., Newman J., Corrosion of an Iron Rotating Disk, Journal of The Electrochemical Society, 120(12): 1682-1686 (1973).
[18] De Waard C., Milliams D., Carbonic Acid Corrosion of Steel, Corrosion, 31(5): 177-181 (1975).
[19] Barz F., Bervstein C., Vielstich W., On the Investigation of Electrochemical Reactions by the Application of Turbulent Hydrodynamics, Advances in Electrochemistry and Electrochemical Engineering, 13: 261-353 (1984).
[20] Davies J.T., "Turbulence Phenomena: an Introduction to the Eddy Transfer of Momentum, Mass, and Heat, Particularly at Interfaces", Elsevier (2012).
[21] Chapman D.R., Kuhn G.D., The Limiting Behaviour of Turbulence Near a Wall, Journal of Fluid Mechanics, 170: 265-292 (1986).

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