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| Simulation on Corrosion of Dissimilar Metallic Coupled Pipes in Seawater Pipe System |
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| DOI：10.7643/issn.1672-9242.2023.04.009 |
| KeyWord:copper alloy seawater pipe system dissimilar metal coupled pipes galvanic corrosion electrochemistry numerical simulation |
| Author | Institution |
| WANG Bing-qin |
State Key Laboratory of Organic-inorganic Composite Materials, Beijing University of Chemical Technology, Beijing , China |
| XIA Deng-hui |
State Key Laboratory of Organic-inorganic Composite Materials, Beijing University of Chemical Technology, Beijing , China |
| LI Zhuo-xuan |
State Key Laboratory of Organic-inorganic Composite Materials, Beijing University of Chemical Technology, Beijing , China |
| JI Hao-tian |
State Key Laboratory of Organic-inorganic Composite Materials, Beijing University of Chemical Technology, Beijing , China |
| CAO Yan-hui |
State Key Laboratory of Organic-inorganic Composite Materials, Beijing University of Chemical Technology, Beijing , China |
| YONG Xing-yue |
State Key Laboratory of Organic-inorganic Composite Materials, Beijing University of Chemical Technology, Beijing , China |
| ZHOU Huan |
China Ship Development and Design Center, Wuhan , China |
| XU Zhi-xiong |
China Ship Development and Design Center, Wuhan , China |
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| Abstract: |
| The work aims to study the galvanic corrosion of dissimilar metal pipes in marine seawater piping systems. Software COMSOL Multiphysics was used to simulate the potential and current density distribution on surface of coupled pipes (red copper (TP2Y) /#20 steel, B10 copper alloy/921A steel, 921A /tin-bronze (XQT)) in a 3.5 wt.% NaCl solution and the galvanic corrosion 60 days after pipe coupling. The results showed that when they were coupled together, the red copper, B10 and tin bronze pipes were be protected as the cathode, but the #20 steel and 921A steel pipes would be eroded as the anode. For coupling of red copper and #20 steel pipes, the protection length of red copper pipes was 425 mm from the coupling, and the galvanic corrosion length of #20 steel pipes was about 500 mm from the flange. For coupling of B10 copper alloy and 921A steel pipes, the protection length of B10 copper alloy pipes was about 500 mm, and the galvanic corrosion length of 921A steel pipes was about 780 mm. For coupling of 921A steel and tin bronze pipes, the protection length of tin bronze pipes was about 620 mm, and the galvanic corrosion length of 921A steel pipes was about 820 mm. In addition, the simulation results also showed that after coupling for 60 days, the maximum corrosion depth near the inner wall of #20 steel pipe was 5.57 μm. Meanwhile, for coupling of B10 alloy and 921A steel pipes, the maximum corrosion depth near the inner wall of 921A steel pipes was 8.31 μm. Then, for coupling of tin bronze and 921A steel pipes, the maximum corrosion depth near the inner wall of 921A steel pipes was 8.48 μm. It is indicated that galvanic corrosion of dissimilar metal pipes was closely related to the potential difference. Meanwhile, during galvanic corrosion, it is easy to cause the nonuniform macroscopic distribution of pipe potential and induce the corrosion caused by macroscopic potential difference. |
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