| 沉管隧道钢壳在海水中的加速腐蚀 |
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| 引用本文： | 高倩钰,曹航,金文良,张晓虎,刘媛媛. 沉管隧道钢壳在海水中的加速腐蚀[J]. 工程科学学报, 2023, 45(6): 941-948. DOI: 10.13374/j.issn2095-9389.2022.09.09.001 |
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| 作者姓名： | 高倩钰 曹航 金文良 张晓虎 刘媛媛 |
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| 作者单位： | 1.中冶建筑研究总院有限公司，北京 100088 |
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| 基金项目： | 广东省重点领域研发计划项目（2019B111105002） |
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| 摘 要： | 沉管隧道置于不易检查和维护的海泥区域，其钢壳结构受到海水的侵蚀，会缩短其服役周期，腐蚀严重则会影响沉管隧道的安全运行.深中通道(又称“深中大桥”)是国内首个钢壳式沉管隧道，耐久性要求100年，针对深中通道钢壳混凝土沉管的服役环境及超高的耐久性要求等诸多特征，且目前国内外可以借鉴的工程和研究很少，因此需要研究揭示钢壳外壁在海洋环境下的腐蚀机理和腐蚀发展规律.本文采用室内腐蚀模拟加速试验及电化学分析测试等，对深中通道沉管隧道钢壳所用Q390C低合金高强度结构钢在模拟海水条件下的腐蚀发生发展规律进行研究.研究发现Q390C在海水中腐蚀产物主要为Fe3O4、α-FeOOH和γ-FeOOH及少量CaCO3，其均匀腐蚀和局部腐蚀速率都呈指数关系下降，最终趋于稳定.
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| 关 键 词： | 深中通道 沉管钢壳 Q390C 海水腐蚀 加速腐蚀 腐蚀研究 |
| 收稿时间： | 2022-09-09 |
Accelerated corrosion of the steel shell of an immersed tube tunnel in seawater |
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| Affiliation: | 1.Central Research Institute of Building and Construction Co. Ltd. MCC Group, Beijing 100088, China2.Shenzhong Link Management Center, Zhongshan 528400, China |
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| Abstract: | China is rich in marine resources, and with the development of its economy and the improvement of its transportation level, the use of immersed tunnel technology is increasingly more extensive. The Shenzhen–Zhongshan Bridge is the first steel shell immersed tunnel in China. The immersed tunnel is located in a sea mud area that is not easy to inspect and maintain, and its steel shell structure is eroded by seawater, which shortens its service cycle, and severe corrosion affects its safe operation. Its durability requirement is 100 years. For the service environment and ultrahigh durability requirements of the Shenzhen–Zhongshan Bridge steel shell concrete immersed pipe and many other characteristics, at present, few engineering and research references at home and abroad can be used. Thus, the corrosion development law of the outer wall of an immersed steel shell in a marine environment must be studied and revealed. In this work, dissolved oxygen (15.2 mg·L–1) was artificially added to a simulated seawater solution as a depolarizing agent to realize the acceleration process of a corrosion simulation acceleration test in the laboratory. The test set cycle was 1, 7, 15, 30, 90, 180, and 365 d, and the test temperature was 25 ℃. Through the electrochemical impedance spectroscopy (EIS), the Tafel polarization curve, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), confocal laser scanning microscopy (CLSM), and other analytical and testing methods of samples with different test cycles, the corrosion occurrence and development law of Q390C low-alloy high-strength structural steel used in deep–medium channel immersed tunnel steel shells under simulated seawater conditions was studied. The corrosion products of Q390C steel in seawater are mainly found to be Fe3O4, α-FeOOH, γ-FeOOH, and a small amount of CaCO3, and their uniform corrosion and local corrosion rates decrease exponentially and eventually tend to stabilize. CLSM test shows that the surface of the specimen begins to corrode uniformly after a test cycle of 15 d, and the pitting corrosion pit depth of the specimen with a test cycle of 365 d can reach 99 μm. The long-term accelerated corrosion test of the steel shell of an immersed tunnel in seawater in this paper is of great importance to ensure the long-life durability of immersed tunnels in marine engineering and similar construction projects. |
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