水下摩擦螺柱焊接头在模拟海水中的耐蚀性能研究  

Study on Corrosion Resistance of Underwater Friction Stud Welding Joint in Simulated Seawater

作　　者：谢小辉 戴婷 马刚 顾艳红[1] 高辉[1] 焦向东[1] XIE Xiaohui;DAI Ting;MA Gang;GU Yanhong;GAO Hui;JIAO Xiangdong(Beijing Key Laboratory of Key Technologies and Equipment for Deepwater Oil and Gas Pipelines,Beijing Institute of Petrochemical Technology,Beijing 102617,China;School of Energy and Power Engineering,Shanghai University of Technology,Shanghai 200093,China)

机构地区：[1]北京石油化工学院,深水油气管线关键技术与装备北京市重点实验室,北京102617 [2]上海理工大学能源与动力工程学院,上海200093

出　　处：《北京石油化工学院学报》2020年第3期16-20,共5页Journal of Beijing Institute of Petrochemical Technology

基　　金：北京市自然科学基金(3192013)。

摘　　要：以摩擦螺柱焊(FSW)接头为研究对象,采用X65钢为焊接基板,16Mn钢为螺柱,制备FSW接头,研究了在模拟海水中FSW接头的电化学腐蚀性能。利用光学显微镜观测FSW接头在模拟海水中腐蚀不同时间后的宏观金相,观测FSW接头在模拟海水中腐蚀8 h后的微观形貌。结果表明:FSW接头在模拟海水环境中的腐蚀时间越久,FSW接头的腐蚀阻抗值减小,腐蚀电流密度增大;但是由于腐蚀产物的影响,腐蚀8h后,开路电位和腐蚀电位出现波动,说明腐蚀产物的出现会减缓FSW接头的腐蚀;宏观金相中FSW接头的整体腐蚀情况与电化学的结论一致,微观金相中FSW接头明显在塞棒区腐蚀更严重,焊缝区耐腐蚀最好,主要是因为制备过程中产生的高温改变了材料的性质,焊缝区组织比较致密平滑。Friction stud welding(FSW)joint is taken as the research object,in this paper,X65 steel was used as base metal,16Mn steel as a stud,and underwater joint was obtained by friction stud welding technology.The electrochemical corrosion performance of FSW joint in simulated seawater is studied.The macroscopic metallography of FSW joint after corrosion in simulated seawater for different time was observed by optical microscope,and the microstructure of FSW joint after corrosion in simulated seawater for 8 hours was observed.The results show that with the longer the corrosion time of FSW joint in simulated seawater environment,the corrosion impedance value of FSW joint decreases and the corrosion current density increases.However,due to the influence of corrosion products,the open circuit potential and corrosion potential fluctuate after 8 hours of corrosion,indicating that the appearance of corrosion products will slow down the corrosion of FSW joints.The overall corrosion of FSW joint in macroscopic metallography is consistent with that of electrochemistry.In microscopic metallography,the corrosion of FSW joint is more serious in plug rod area,and the corrosion resistance in weld zone is the best.The main reason is that the high temperature produced in the process of preparation changes the properties of the material,and the microstructure of the weld zone is relatively dense and smooth.

关 键 词：FSW接头 金相图 电化学性能 

分 类 号：TG174.3[金属学及工艺—金属表面处理]