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| The Evaluation of Aluminum Alloy Anode and Its Associated Protection Simulation in the Brine With Backfilled Stone for the Steel Sheet of Immersed Tunnel |
| Received:July 30, 2020 Revised:October 14, 2020 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2021.09.012 |
| KeyWord:steel shell concrete immersed tunnel aluminum alloy anode cathodic protection electrochemical performance backfilled stone |
| Author | Institution |
| ZHAO Yong-tao |
SunRui Marine Environment Engineering Co., Ltd, Qingdao , China |
| SONG Shen-you |
Shenzhen-Zhongshan Link Administration Center, Zhongshan , China |
| SUN Ren-xing |
SunRui Marine Environment Engineering Co., Ltd, Qingdao , China |
| YIN Ping |
SunRui Marine Environment Engineering Co., Ltd, Qingdao , China |
| BAI Run-hao |
SunRui Marine Environment Engineering Co., Ltd, Qingdao , China |
| YIN Xue-tao |
SunRui Marine Environment Engineering Co., Ltd, Qingdao , China |
| GAO Jian-bang |
SunRui Marine Environment Engineering Co., Ltd, Qingdao , China |
| ZHU Shuai-shuai |
SunRui Marine Environment Engineering Co., Ltd, Qingdao , China |
| JIN Wen-liang |
Shenzhen-Zhongshan Link Administration Center, Zhongshan , China |
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| Abstract: |
| This paper aims to solve the uncertainty of electrochemical performance evaluation of sacrificial anode in buried medium and realize the evaluation and comparison of capacitance test results of sacrificial anode in heterogeneous medium. The capacitance and dissolution morphology of aluminum alloy sacrificial anode were evaluated by simulating the environmental medium buried in immersed tunnel. In order to distinguish the existing detection methods of aluminum anode in homogeneous medium such as seawater, an evaluation method of electrochemical performance of aluminum anode in heterogeneous medium was developed. In addition, in the above buried medium, measuring the polarization curves of anode and cathode and modifying the boundary conditions of simulation calculation were conducive to simulate the cathodic protection potential distribution in this high resistivity medium environment. The resistivity measured by the test box was equivalent to that measured by the commercial portable conductivity meter. A1 anode had stable performance in seawater with low resistivity (25~40 Ω.cm), stable capacitance at 2500 A.h/kg and good solubility; in the mixed medium of 40 Ω.cm sea fresh water + backfilled stone, the capacitance test value data fluctuated greatly and the reproducibility was poor. The capacitance of B1 anode in seawater (25~40 Ω.cm) was equivalent to that of A1 anode, and there was no difference. In the mixed medium of 40 Ω.cm sea and fresh water + backfilled stone, the dispersion of capacitance value was small and the electrochemical activity was high. The associated results displays the comprehensive effects under the salinity of brackish water, overall resistivity of heterogeneous medium and the block effect of dissolved product in the stones. The testing under the marine brackish/backfilled stone/deposited sea mud will be appropriate for evaluation of aluminum alloy anode and its protection performance for the steel shell immersed tube tunnel and also the predicted usage life of anode in the backfilled stone condition will be accurately. |
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