三峡船闸输水廊道反弧门涂层失效及腐蚀原因分析  

Reasons for coating failure and corrosion of reversed radial gate in water conveyance gallery of Three Gorges ship lock

作　　者：秦永坤 李伟雄 李岩[1] 朱锡昶[1] 韩亦淼 QIN Yongkun;LI Weixiong;LI Yan;ZHU Xichang;HAN Yimiao(Nanjing Hydraulic Research Institute,Nanjing 210024,China;River Basin Complex Administration Center,China Three Gorges Corporation,Yichang 443133,China)

机构地区：[1]南京水利科学研究院,江苏南京210024 [2]中国长江三峡集团有限公司流域枢纽运行管理中心,湖北宜昌443133

出　　处：《水运工程》2023年第9期106-111,共6页Port & Waterway Engineering

基　　金：中央级公益性科研院所基本科研业务费用专项基金资助项目(Y422006)。

摘　　要：为保障三峡船闸输水廊道反弧门的运行安全,在2021和2022年三峡船闸计划性停航检修期间,对南北两线船闸反弧门的腐蚀状况进行检测和评估,分析其防腐蚀涂层起泡破坏及门体腐蚀的原因。结果表明,反弧门涂层存在大面积起泡、剥落,门体及构件的局部腐蚀问题凸显,涂层损伤及锈蚀面积约占反弧门检测面积的20%。反弧门原有涂装材料和热喷锌层仍能发挥防腐蚀作用,尚不需要进行大面积维修,但对于局部腐蚀和涂层破坏明显的区域,应及时修复,并加强检测、维护,避免发生腐蚀失效威胁门体安全。同时,针对反弧门遭受的高速水流冲蚀、空蚀以及电偶腐蚀耦合破坏问题,提出进行反弧门表面高弹、抗冲耐磨防护材料修复以及施加牺牲阳极阴极保护防护试验研究的建议。To guarantee the service safety of reversed radial gate in water conveyance gallery of Three Gorges ship lock,the planning maintenance is conducted in the suspended shipping periods of 2021 and 2022,respectively.The coating failure and corrosion situations of reversed radial gate in water conveyance gallery are detected and evaluated during these periods.The reasons for anti-corrosion coating blistering and steel gate corrosion are analyzed in detail.The results show that the blistering and flaking of anti-corrosion coatings are presented widely on these reversed radial gates of Three Gorges ship lock.In special,local corrosion occurs on the steel gates as well as their components.The total area of coating damage and corrosion is in a proportion of about 20 percent of the detected region for each reversed radial gate.The retained organic coating and thermal-sprayed zinc layer can still play a role in preventing the reversed radial gate against corrosion,giving rise to a fact that the large area maintenance is not an urgent requirement.However,the local corrosion and coating failure areas need to be repaired in time followed by the strengthened detection and maintenance so as to avoid the threat to the safety of reversed radial gate.Meanwhile,the research in terms of high elastic,impact-resistant materials repairment and the sacrificial anode cathodic protection application is suggested to conduct on the reversed radial gate of Three Gorges ship lock,which is expected to suppress the coupling damage from erosion,cavitation erosion and galvanic corrosion.

关 键 词：三峡船闸 反弧门 涂层失效 腐蚀 

分 类 号：U641[交通运输工程—船舶及航道工程]