| 引用本文: | 刘明维,曾丽琴,余杰,梁越,王俊杰,杨成渝.内河码头钢构件防腐涂层冲蚀特性及损伤模型[J].哈尔滨工业大学学报,2019,51(10):115.DOI:10.11918/j.issn.0367-6234.201807166 |
| LIU Mingwei,ZENG Liqin,YU Jie,LIANG Yue,WANG Junjie,YANG Chengyu.Erosion characteristics and damage model of anti-corrosion coating onsteel-structure in inland river wharf[J].Journal of Harbin Institute of Technology,2019,51(10):115.DOI:10.11918/j.issn.0367-6234.201807166 |
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| 内河码头钢构件防腐涂层冲蚀特性及损伤模型 |
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刘明维1,2,曾丽琴1,2,余杰1,2,梁越1,2,王俊杰2,3,杨成渝1,2
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(1.重庆交通大学 国家内河航道整治工程技术研究中心,重庆 400074; 2.水利水运工程教育部重点实验室(重庆交通大学),重庆 400074;3.重庆交通大学 重庆市高校水工建筑物健康诊断技术与设备工程研究中心,重庆 400074)
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| 摘要: |
| 为获得内河码头钢构件防腐涂层的损伤规律,通过物理模型试验研究含沙水流条件下钢构件防腐涂层的冲蚀特性,分析涂层损伤过程,提出适于内河码头钢构件涂层冲蚀损伤模型.首先,结合长江上游含沙水流冲蚀环境条件,确定冲蚀试验参数,制备涂覆环氧沥青涂层的钢构件,按照相似比尺缩放,模拟现场码头钢构件涂层受含沙水流冲蚀4个月的情况,观察冲蚀损伤后形貌,发现现场实测和室内试验呈现出相似的破坏过程和损伤规律.然后,开展钢构件防腐涂层冲蚀特性试验,重点研究含沙水流条件下防腐涂层在不同冲角、冲蚀时间、含沙量等条件下与冲蚀量的关系.涂层冲蚀量随冲角-45°~90°呈现“中间大,两边小”的趋势,涂层最大冲蚀量出现在40°冲角左右；缓增期涂层各冲角的厚度冲蚀量与冲蚀时间近似呈现线性相关；高含沙量条件下涂层的整体冲蚀量随流速增加近似呈指数增长.最后,基于钢构件防腐涂层冲蚀试验结果和现有冲蚀理论,改进了防腐涂层冲蚀损伤模型公式,利用此公式得出在大流速下涂层的临界冲角约为40°,与试验结果较吻合.研究表明:利用该冲蚀试验,可以获得内河码头钢构件防腐涂层的损伤规律以及冲蚀特性；利用改进的损伤模型可以有效地计量水工钢构件防腐涂层的损伤量,为研发新型防腐涂层提供理论依据. |
| 关键词: 内河码头 钢构件 防腐涂层 冲蚀试验 损伤模型 |
| DOI：10.11918/j.issn.0367-6234.201807166 |
| 分类号:TV47 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(51479014),重庆市社会民生科技创新(cstc2017shmsA30002);四川省交通厅(2018-B-04) |
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| Erosion characteristics and damage model of anti-corrosion coating onsteel-structure in inland river wharf |
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LIU Mingwei1,2,ZENG Liqin1,2,YU Jie1,2,LIANG Yue1,2,WANG Junjie2,3,YANG Chengyu1,2
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(1.National Inland Waterway Improvement Engineering Research Center, Chongqing Jiaotong University, Chongqing 400074, China; 2. Key Laboratory for Hydraulic and Waterway Engineering of Ministry of Education (Chongqing Jiaotong University), Chongqing 400074, China; 3. Engineering Research Center of Diagnosis Technology and Instruments of Hydro-Construction, Chongqing Jiaotong University, Chongqing 400074, China)
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| Abstract: |
| In order to obtain the damage rule of anti-corrosion coating on steel structures of inland river, the erosion characteristics of anti-corrosion coating on steel structures under the condition of sand flow were studied by physical model test, the process of coating damage was analyzed, and the erosion damage model for steel structures’ coatings in inland river wharf was proposed. First of all, combined with the environmental conditions of the sandy water flow in the upper reaches of the Yangtze River, the erosion test parameters were determined, and the steel structures coated with an epoxy asphalt coating was prepared. According to similar scaling, the coating of the steel structure of the on-site dock was simulated by the sandy water flow for 4 months. Through observing the morphology after erosion damage, it was found that the model test and the field coating erosion test showed similar failure processes and damage patterns. Then, the physical model test was carried out, which focused on the relationship between the corrosion resistance of steel structures under different conditions of angle of attack, erosion time, and sediment concentration with sandy water flow. The coating of the maximum eclipse appeared in 40° angle of attack, and coating erosion quantity with -45°~90° angle of attack showed the tendency of "between big and small on both sides. During slow increase period, there was a linear correlation between the thickness and the erosion time of each impact angle. Under the condition of high sand concentration, the overall erosion amount of the coating increased exponentially with the increase of velocity of flow. Finally, based on the corrosion test results of steel structures’ anti-corrosion coating and the existing erosion theory, the erosion damage model of anti-corrosion coating was improved. The critical angle of attack of the coating at high flow rate was about 40°, which was in good agreement with the test results. The research shows that the damage law and erosion characteristics of the anti-corrosion coating on the steel structures in inland river wharf can be obtained by using the erosion test. The damage model of the hydraulic steel structures’ anti-corrosion coating can be effectively measured by the improved damage model, which provides a theoretical basis for the development of new anti-corrosion coatings. |
| Key words: inland river wharf steel structures anti-corrosion coating erosion test damage model |
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