Materials Performance

APR 2017

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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38 APRIL 2017 MATERIALS PERFORMANCE NACE INTERNATIONAL: VOL. 56, NO. 4 actual potentials of support tubes that are n o t i m m e d i a t e ly a d j a c e n t t o a n o d e s exhibit better protection levels than were predicted. Conclusions For a jacket in seawater protected by applying a sacrificial anode system, the dis- tributions of potential and protective CD and anodic CD outputs of anodes were sim- ulated through COMSOL software. The optimum arrangement of anodes to reach uniform potential distribution and mass loss rates was successfully determined by FEM. The influence of water quality on the potentials and protective and anodic CD distributions was also determined. Due to the credibility of the optimized sacrificial anode system design, the modeling results are in good agreement with the in situ results in the Caspian Sea. The FEM simu- lation, therefore, was applied successfully for modeling the sacrificial anode system for steel jackets in marine environments. References 1 A.W. Peabody, Control of Pipeline Corrosion, 2nd ed. (Houston, TX: NACE International, 2001): pp. 21-64. 2 I. Gurrappa, "Cathodic Protection of Cooling Water Systems and Selection of Appropriate Materials," J. Materials Processing Technology 166 (2005): pp. 256-267. 3 DNV-RP-B401, "Cathodic Protection Design" (HØvik, Norway : DNV GL, 2010), pp. 14-23. 4 S.S. Rao, The Finite Element Method in Engi neering (Oxford, U.K.: Butterworth-Heine- mann, 2005): pp. 3-42. 5 D.N.C. Robson, "Cathodic Protection of Off- shore Structure Materials—Problems and Solutions," Materials and Design 7 (1986): pp. 134-142. 6 R. Strommen, W. Keim, J. Finnegan, P. Mehdi- zadeh, "Advances in Offshore Cathodic Pro- tection Modeling Using the Boundary Ele- ment Method," MP 26, 2 (1987): pp. 23-28. 7 J.X. Jia, G. Song, A. Atrens, "Inf luence of Geometry on Galvanic Corrosion of AZ91D Coupled to Steel," Corros. Sci. 48 (2005): pp. 2,133-2,153. 8 J.X. Jia, G. Song, A. Atrens, "Experimental Measurement and Computer Simulation of Galvanic Corrosion of Magnesium Coupled to Steel," Advanced Engineering Materials 9 (2007): pp. 65-74. 9 O. Abootalebi, et al., "Optimizing the Elec- trode Position in Sacrificial Anode Cathodic Protection Systems Using Boundary Element Method," Corros. Sci. 52, 3 (2010): pp. 678-687. 10 E.J.F. D ickinson , H. Ek ström , E. Font es, "COMSOL Multiphysics: Finite Element Soft- ware for Electrochemical Analysis," Elec trochemistr y Communications 40 (2014): pp. 71-74. 11 W. Keim, R. Strommen, J. Jelinek, "Computer Modeling in Offshore Platform CP Systems," MP 27, 9 (1988): pp. 25-28. 12 K.S. Yeung, "The Effect of Protective Coatings on Galvanic Corrosion for Bolted Compo- nents," WIT Transactions on Modelling and Simulation 27 (2001): pp. 275-282. 13 Z. Lan, et al., "Simulation of Sacrificial Anode Protection for Steel Platform Using Bound- ary Element Method," Engineering Analysis with Boundary Elements 36 (2012): pp. 903- 906. 14 J.M. Baynham, T. Froome, R.A. Adey, "Jacket S AC P Syst em D esign and O ptimi zation Using Simulation," CORROSION 2012, paper no. 2012-1281 (Houston, TX: NACE, 2012). 15 L.Y. Xu , Y.F. Ch en g, " E xp erim ental and Nu m e r i c a l S tu d i e s of E f f e c t iv e n e s s of Cathodic Protection at Corrosion Defects on Pipelines," Corros. Sci. 78 (2014): pp. 162-171. MASOOD HAJIGHOLAMI is a master stu- dent at the Department of Materials Engineering, Isfahan University of Tech- nology, Isfahan 841-8311, Iran, email: masudhajigholami@gmail.com. He is in- volved in numerical simulation through FEM and BEM as well as research in the field of corrosion. KEYVAN RAEISSI is a professor in the De- partment of Materials Engineering, Isfahan University of Technology, email: k-raeissi@ cc.iut.ac.ir. He has spent the last 13 years teaching advanced electrochemistry, ad- vanced corrosion, corrosion inhibitors, cor- rosion in welding joints, paint and convert- ing coatings, and pyrometallurgy. He has published more than 100 journal articles. HAMIDRESA SALIMI JAZI is an associate professor in the Department of Materials Engineering, Isfahan University of Technol- ogy, email: hrjazi@cc.iut.ac.ir. He teaches and conducts research and development in the area of surface treatments and bioma- terials engineering. He has published more than 70 papers. SAEID SHABANI is a faculty member and head of the Material and Structure Group at the Subsea R&D; Center, Isfahan Univer- sity of Technology, email: sshabani@cc.iut. ac.ir. He has conducted research in marine environments for 24 years. He has pub- lished more than 20 marine project reports and more than 30 papers. CATHODIC PROTECTION

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