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Numerical simulation and re‐design optimization of impressed current cathodic protection for an offshore platform with biofouling in seawater
Author(s) -
Wang W.,
Li W.H.,
Song L.Y.,
Fan W.J.,
Liu X.J.,
Zheng H.B.
Publication year - 2018
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201709685
Subject(s) - biofouling , seawater , cathodic protection , submarine pipeline , marine engineering , corrosion , anode , finite element method , environmental science , artificial seawater , remotely operated underwater vehicle , materials science , metallurgy , environmental engineering , engineering , geology , geotechnical engineering , computer science , structural engineering , oceanography , chemistry , membrane , biochemistry , electrode , artificial intelligence , robot , mobile robot
A finite element model (FEM) of the offshore platform with biofouling is developed here to predict the effectiveness of the ICCP under seawater. Remotely operated vehicle (ROV) test verified that the offshore platform was fully covered by a coating‐like biofouling to protect the structures from corrosion. FE‐SEM and EDS tests demonstrated that the biofouling deposits on the offshore platform mainly contained magnesium oxides, biofouling deposits, and corrosion products doped with calcium oxides. The polarization relationships of platform steel with biofouling coverage were used as boundary conditions for the numerical simulation. Furthermore, the factors including output current, anode location, seawater conductivity, and biofouling coverage rate, which influenced the protective effectiveness, were comparatively evaluated by FEM. Then, a re‐design two‐anode ICCP system was employed to keep offshore platform in protective condition. A ROV monitored the potential distributions of the legs and demonstrated that numerical simulation results of ICCP had a good agreement with measured data.