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| Numerical Simulation of DC Stray Current on Seawater Pipe of Ship |
| Received:December 02, 2020 Revised:February 26, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2021.09.014 |
| KeyWord:pipe DC stray current corrosion numerical simulation insulation resistance cupronickel |
| Author | Institution |
| XING Shao-hua |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao , China |
| YANG Guang-fu |
Naval Research Academy of PLA, Beijing , China |
| LIU Guang-yi |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao , China |
| ZHENG Fei |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao , China |
| XU Chuan-xin |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao , China |
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| Abstract: |
| In view of the stray current corrosion perforation problem of seawater pipelines of a certain type of ship, the relationship between the DC stray current density of seawater pipelines and the insulation resistance of DC electrical equipment enclosures is studied, the risk of DC stray current corrosion of seawater pipelines is evaluated, and the insulation resistance requirements of the enclosure of DC electrical equipment are proposed to provide technical support for the control of stray currents in marine seawater pipelines. According to Ohm’s law and the principle of corrosion electrochemistry, a DC stray current corrosion simulation method for ship hull and seawater pipelines was established to simulate the straight pipes, elbow pipes and the structure of the seawater pipeline system of a ship. The polarization curve of B10 cupronickel was taken as the boundary conditions, the simulation study of the DC stray current density of the pipe wall was carried out, and the corrosion rate of the DC stray current was calculated according to Faraday’s law. Most of the DC stray current generated by the grounding of DC electrical equipment flowed into the hull, and only a small part flowed into the seawater pipeline. Under normal circumstances, the insulation resistance of the chassis is greater than 1 MΩ, and the grounding of the DC electrical equipment will not cause stray currents in the seawater pipeline corrosion. In order to avoid the stray current corrosion of the seawater pipeline caused by the grounding of DC electrical equipment, the insulation resistance of the enclosure of DC380 V and DC220 V electrical equipment should be no less than 211 Ω and 123 Ω, respectively. |
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