温度和溶解氧对7A09铝海水腐蚀行为影响  

Effects of Temperature and Dissolved Oxygen Concentration on the Corrosion Behavior of 7A09 Aluminum Alloy in Seawater

作　　者：刘爽 李若灿 段体岗 杨龙 吴建国[3] 张海兵[2] 马力[2] 侯健 LIU Shuang;LI Ruocan;DUAN Tigang;YANG Long;WU Jianguo;ZHANG Haibing;MA Li;HOU Jian(Chemical Engineering College,Inner Mongolia University of Technology,Huhehaote 010051,China;National Key Laboratory of Marine Corrosion and Protection,Luoyang Ship Material Research Institute(LSMRI),Qingdao 266237,China;Science and Technology on Reliability and Environmental Engineering Laboratory,Beijing Institute of Structure and Environment Engineering,Beijing 100076,China)

机构地区：[1]内蒙古工业大学化工学院,呼和浩特010051 [2]洛阳船舶材料研究所海洋腐蚀与防护全国重点实验室,青岛266237 [3]北京强度环境研究所可靠性与环境工程技术重点实验室,北京100076

出　　处：《强度与环境》2024年第5期44-52,共9页Structure & Environment Engineering

基　　金：国家重点研发计划资助(2022YFB3808800);北京强度环境研究所联合创新基金(BQJJ202310)。

摘　　要：开展了7A09铝合金材料在实验室模拟海洋环境的腐蚀实验,考察了温度和溶解氧浓度对7A09铝合金材料腐蚀形貌、腐蚀规律和电化学行为的影响。结果显示,随着温度升高,7A09铝合金的腐蚀速率增大,导致腐蚀过程加剧,从点蚀逐渐趋向于均匀腐蚀。随着溶解氧浓度的降低,7A09铝合金表面钝化膜的形成受到影响,腐蚀速率增加,点蚀现象加剧。适当的氧含量有助于增强钝化膜的修复能力,提高其稳定性,从而增强了抗点蚀和缝隙腐蚀的能力。这些发现为7A09铝合金在海水环境中的应用提供了重要的技术支持和设计指导,有助于改进海洋装备和延长其使用寿命。Experiments on the corrosion behavior of 7A09 Al-alloy were carried out by simulating deep-sea environment equipment,and the corrosion morphology,corrosion pattern and electrochemical behavior of 7A09 Al-alloy were analyzed in deep-sea environments with different temperatures and dissolved oxygen concentrations.The results show that the corrosion process of 7A09 Al-alloy intensifies with the increase of temperature,resulting in the increase of corrosion rate,and gradually tends to uniform corrosion from pitting corrosion.With the decrease of dissolved oxygen concentration,the formation of passivation film on the surface of 7A09 Al-alloy was affected,the corrosion rate increased,and the pitting corrosion phenomenon intensified.Appropriate oxygen content helps to enhance the repair ability of the passivation film and improve its stability,thus increasing the resistance to pitting and crevice corrosion.These findings provide important technical support and design guidance for the application of 7A09 Al-alloy in deep-sea environments,which can help improve the selection of materials and extend the service life of deep-sea equipment.

关 键 词：7A09铝合金 模拟海洋环境 腐蚀行为 温度 溶解氧浓度 

分 类 号：TD123[矿业工程—矿山地质测量]