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Abstract

When condensers with carbon steel waterbox and titanium tube structure were protected by SACP in an ocean beach power plant,while seawater were used to be cooling water,carbon steel was under-protected and Titanium was over-protected,because their protective potential are less than-0.85V(vs.SCE) and more than-0.75V(vs.SCE) separately.In order to optimize the SACP design,potential distribution of two materials must be obtained during the SACP process.In the lab,carbon steel waterbox and Titanium tube model(Q235-Ti model) were set up.A series of electrochemical techniques(steady polarization,galvanostatic charge technique)were used to obtain reasonable boundary condition and surface form of two materials during the SACP process.The experiments were carried out to validate 3-D potential distribution under one anode SACP condition by finite element method(FEM).The calculation results were consistent with measuring results.The results can be used to provide a theoretical foundation to design an optimal cathodic protection.

Keywords

condenser, cathodic protection, FEM, potential distribution

Publication Date

2007-11-28

Online Available Date

2007-11-28

Revised Date

2007-11-28

Received Date

2007-11-28

References

[1]Chen Shaowei,Hartt W H.Steel cathodic polarizationcharacteristic in sea water and a new approach for ca-thodic protection system design[J].Corrosion Scienceand Protection Technology,1996,8(1):17-25.
[2]John W Fu.A finite element analysis of corrosion cells[J].Corrosion,1982,38:295-296.
[3]Raymand S MA.Mathematical model for a galvanic an-ode cathodic protection system[J].Corrosion,1982,38:171-185.
[4]Luiz C.Wrobel,Panayiotis Miltiadou.Genetic algorithmsfor inverse cathodic protection problems[J].Engineer-ing Analysis with Boundary Elements,2004,(28):267-277.
[5]Ramanan V S,Muthukumar M,Gnanasekaran S,et al.Green function for the laplace equation in a 3-layer me-dium boundary element integrals and their application tocathodic protection[J].Engineering Analysis withBoundary Elements,1999,23:777-786.
[6]John W Fu,Siu-kee Chan.A finite element menthod formodeling localized corrosion cells[J].Corrosion,1984,40:540-545.
[7]Amaya K,Aoki S.Effection boundary element methodin corrosion analysis[J].Engineering Analysis withBoundary Element,2003,(27):507-519.
[8]Cao Shengshan(曹圣山),Wang Qingzhang(王庆璋),Zhang Manping(张曼平).Numerical modeling for off-shore platform cathodic protection-iocal system[J].Chin J Oceanol.Limnol,1995,13:247-252.
[9]Rolf G kasper,Martin G April.Electrgalvanic finite ele-ment analysis of partially protected marine structures[J].National Association of Corrosion Engineer,1983,39:181-188
[10]Schwenkw.Currentdistributionduringtheelectrochemi-cal corrosion protection of pipes[J].Corrosion Sci-ence,1983,23:871-886.
[11]Nisancionglu K.Predicting the time dependence of po-larization on cathodically protected steel in seawater[J].Corrosion,1987,43:100-110.
[12]Fu J W,Chow J S K.Cathodic protection designs u-sing an integral equation numerical method[J].Mate-rials Performance,1982,21:8-12.
[13]Raymond S Munn.A mathematical model for a galvan-ic anode cathodic protection system[J].Materials Per-formance,1982,21(8):29-36.
[14]Fu J W,Chan S K.Finite element determination ofgalvanic corrosion during chemical cleaning of steamgenerator[J].Materials Performance,1986,25:33-40.
[15]Hartt W H,Kunjapur M M,Influence of temperatureand exposure time upon calcareous deposits[J].Corro-sion,1987,43:674-669.
[16]Perolav Gartland,Roe D Strommen.Offshore cathodicprotection design,inspection,and computer modeling[J].Material Performance,1993,11:453-460.
[17]Brenda J little,Patricia A Wanger.Interrelationshipbetween marine befouling and cathodic protection[J].Material Performance,1993,9:369-379.
[18]Pretice G,Holser R A,Jfarozic V,et al.Cathodic pro-tection modeling of galvanically coupled heat exchang-ers[J].Corrosion,1990,46:75-84.
[19]WEN Guo-mou(温国谋),ZHENG Fu-yang(郑辅养).Impedance characteristics of calcareous deposit[J].Chin J Oceanol Limnol,1996,14:277-281.
[20]Ch Barchiche,Deslouis C,Festy D,et al.Character-ization of calcareous deposits in artificial seawater byimpedance techniques 3-deposite of CaCO3in the pres-ence of Mg(Ⅱ)[J].Electrochimical Acta,2003,48:1645-1654.
[21]Creus J,Idrissi H,Mazille H.Corrosion behavior ofAl/Ti coating elaborated by cathodic arc PVD processonto mild steel substrate thin solid films[J].Thin Sol-id Films,1999,346:150-154.

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