基于岸基与远洋移动平台的7B04铝合金腐蚀行为比较研究  

Comparative Research on Corrosion Behaviors of 7B04 Aluminium Alloy on the Ocean-going Ship Platform and Offshore Platform

作　　者：张凯[1,2,3] 李迪凡 文邦伟[1] 沈蕾芳 ZHANG Kai;LI Di-fan;WEN Bang-wei;SHEN Lei-fang(Southwest Technology and Engineering Research Institute,Chongqing 400039,China;Chongqing Key Laboratory of Environmental Effect and Protection,Chongqing 400039,China;Wanning Hainan Branch of National Observation&Research Station for Materials Corrosion in Atmospheric Environment,Wanning 571500,China)

机构地区：[1]西南技术工程研究所,重庆400039 [2]环境效应与防护重庆市重点实验室,重庆400039 [3]海南万宁大气环境材料腐蚀国家野外科学观测研究站,海南万宁571500

出　　处：《表面技术》2021年第1期405-412,共8页Surface Technology

摘　　要：目的研究动态海洋大气环境与静态海洋大气环境对7B04铝合金腐蚀行为的影响。方法采用7B04铝合金,分别在远洋船舶移动平台和万宁站海洋平台开展1年户外大气暴露试验,利用腐蚀形貌、腐蚀失重、力学性能表征7B04铝合金在海洋大气环境中的腐蚀规律和行为。结果经过1年的户外大气暴露试验,在动态和静态两种海洋大气环境作用下,7B04铝合金的腐蚀类型均为点蚀,且远洋船舶移动平台7B04铝合金的腐蚀程度更严重。在远洋船舶移动平台开展动态自然环境试验的7B04铝合金腐蚀速率为67.4μm/a,在万宁站海洋平台开展静态自然环境试验的7B04铝合金腐蚀速率为16.6403μm/a,远洋船舶移动平台7B04铝合金的腐蚀速率约为万宁站海洋平台的4倍。远洋船舶移动平台试验7B04铝合金的拉伸强度、规定塑性延伸强度和断后伸长率保留率分别为91%、87.5%和54.3%。结论 7B04铝合金在远洋船舶移动平台和万宁站海洋平台的腐蚀类型均为点蚀,远洋船舶移动平台的动态海洋大气腐蚀性强于静态海洋大气,且对7B04铝合金力学性能的降低主要体现在断后伸长率方面,可显著加速7B04铝合金的腐蚀。In order to study the influence of dynamic and static marine atmosphere on the corrosion behaviors of 7B04 aluminum alloy,measured the corrosion morphology,corrosion weight loss and mechanical property of 7B04 aluminum alloy after 1-year outdoor atmospheric exposure on the ocean-going ship platform and offshore platform of Wanning station.The results showed that:1)Under dynamic and static marine atmosphere,pitting corrosion occurred on the surface of 7B04 aluminum alloy,and the corrosion on the ocean-going ship platform was more serious than that on offshore platform of Wanning station.2)The corrosion rate of 7B04 aluminum alloy in the dynamic natural environment test on the ocean-going ship platform was 67.4μm/a,and that in the static natural environment test on the offshore platform of Wanning station was 16.6403μm/a,so the corrosion rate of 7B04 aluminum alloy under dynamic marine atmosphere on ocean-going ship platform is about 4 times that under static marine atmosphere on the offshore platform of Wanning station.3)The retention rate of tensile strength,specified plastic elongation strength and percentage elongation after fracture of 7B04 aluminum alloy on the ocean-going ship platform were 91%,87.5%and 54.3%,respectively.Therefore,the percentage elongation after fracture among the mechanical properties of 7B04 aluminum alloy is reduced the most,which can significantly accelerate the corrosion of 7B04 aluminum alloy.

关 键 词：动态自然环境试验 海洋大气 7B04铝合金 腐蚀行为 点蚀 

分 类 号：TG172[金属学及工艺—金属表面处理]