沉管隧道钢壳在海水中的加速腐蚀高倩钰1),曹航1),金文良2)✉,张晓虎1),刘媛媛1)1)中冶建筑研究总院有限公司,北京1000882)深中通道管理中心,中山528400✉通信作者,E-mail:56194030@qq.com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.关键词深中通道;沉管钢壳;Q390C;海水腐蚀;加速腐蚀;腐蚀研究分类号TB304AcceleratedcorrosionofthesteelshellofanimmersedtubetunnelinseawaterGAOQian-yu1),CAOHang1),JINWen-liang2)✉,ZHANGXiao-hu1),LIUYuan-yuan1)1)CentralResearchInstituteofBuildingandConstructionCo.Ltd.MCCGroup,Beijing100088,China2)ShenzhongLinkManagementCenter,Zhongshan528400,China✉Correspondingauthor,E-mail:56194030@qq.comABSTRACTChinaisrichinmarineresources,andwiththedevelopmentofitseconomyandtheimprovementofitstransportationlevel,theuseofimmersedtunneltechnologyisincreasinglymoreextensive.TheShenzhen–ZhongshanBridgeisthefirststeelshellimmersedtunnelinChina.Theimmersedtunnelislocatedinaseamudareathatisnoteasytoinspectandmaintain,anditssteelshellstructureiserodedbyseawater,whichshortensitsservicecycle,andseverecorrosionaffectsitssafeoperation.Itsdurabilityrequirementis100years.FortheserviceenvironmentandultrahighdurabilityrequirementsoftheShenzhen–ZhongshanBridgesteelshellconcreteimmersedpipeandmanyothercharacteristics,atpresent,fewengineeringandresearchreferencesathomeandabroadcanbeused.Thus,thecorrosiondevelopmentlawoftheouterwallofanimmersedsteelshellinamarineenvironmentmustbestudiedandrevealed.Inth...