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| Failure Analysis and Laboratory Study of Zinc Anode in Ballast Tank |
| Received:March 20, 2020 Revised:April 20, 2020 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2020.10.010 |
| KeyWord:FPSO ballast tank zinc anode failure experimental study |
| Author | Institution |
| ZHU Fei-yue |
Offshore Oil Engineering Co., Ltd, Tianjin , China |
| ZHANG Guo-qing |
Offshore Oil Engineering Co., Ltd, Tianjin , China |
| LYU Jian-wei |
Offshore Oil Engineering Co., Ltd, Tianjin , China |
| SONG Bo |
Offshore Oil Engineering Co., Ltd, Tianjin , China |
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| Abstract: |
| The work aims to find out the cause for failure of zinc anode in ballast tank and put forward the repair plan. The service environment was investigated, the chemical composition of anode was tested, the electrochemical properties were inspected and the surface morphology was detected. The dry-wet alternating environment and high temperature were main causes for passivation of zinc anode. Under dry-wet alternating environment, the grains on the corroded surface of anode were loose, the width of grain boundary was large and the intergranular corrosion and grain shedding occurred, resulting in anode failure. Through the experimental study of this project, the applicable conditions of zinc anode are obtained. In the dry-wet alternating environment and at high temperature (50 ℃), aluminum anode instead of zinc anode is recommended. |
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