水下摩擦螺柱焊接头在饱和CO<sub>2</sub>中的电化学性能

doi:10.11902/1005.4537.2019.237

中国腐蚀与防护学报

2021, Vol. 41

Issue (1): 87-95 DOI: 10.11902/1005.4537.2019.237

研究报告

本期目录 | 过刊浏览

水下摩擦螺柱焊接头在饱和CO₂中的电化学性能

戴婷¹, 顾艳红¹, 高辉¹(

), 刘凯龙¹, 谢小辉², 焦向东¹

^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

Electrochemical Performance of Underwater Friction Stud Welding Joint in CO₂ Saturated NaCl Solution

DAI Ting¹, GU Yanhong¹, GAO Hui¹(

), LIU Kailong¹, XIE Xiaohui², JIAO Xiangdong¹

^1.Beijing Key Laboratory of Key Technologies and Equipment for Deepwater Oil and Gas Pipelines, Beijing Institute of Petrochemical Technology, Beijing 102617, China
^2.School of Energy and Power Engineering, Shanghai University of Technology, Shanghai 200093, China

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摘要:

以X65钢为焊接基板，16Mn钢为螺柱，利用摩擦螺柱焊 (FSW) 技术获得水下FSW 接头，研究了接头和X65钢在通入饱和CO₂的NaCl溶液中的电化学腐蚀性能。利用光学显微镜观察试样的宏观和微观金相，利用SEM观测FSW接头腐蚀8 h后的腐蚀形貌，并结合XRD和EDS分析接头腐蚀产物的成分和元素。结果表明：FSW接头整体的开路电位更正、阻抗更大、腐蚀电流密度更小，说明FSW接头的耐腐蚀性整体比X65管线钢要好；FSW接头各个区域中，焊缝区和塞棒区腐蚀较轻，而上热影响区、下热影响区和母材区腐蚀较严重；FSW接头试样在饱和CO₂的NaCl溶液中的腐蚀产物为Fe₂O₃。

关键词 ： FSW接头, X65管线钢, 电化学性能, 饱和CO₂

Abstract：

The underwater friction stud welding (FSW) joint was obtained with X65 steel as substrate and 16Mn steel as stud. The electrochemical corrosion performance of the FSW joint and X65 steel in NaCl solution saturated with CO₂ were studied by means of electrochemical methods, macroscopic- and microscopic-metallography, scanning electron microscope (SEM) with energy spectrum analyzer (EDS) and X-ray diffractometer (XRD). The results show that the open circuit potential of FSW joint is more positive, the impedance is larger and the corrosion current density is smaller, which indicates that the corrosion resistance of FSW joint is better than that of X65 pipeline steel. According to the microscopic metallography observation for every zone of the FSW joint, it is found that the corrosion in central welded zone is lighter, while the corrosion in upper heat affected zone, lower heat affected zone and base metal zone is more serious. The EDS and XRD results showed that the corrosion product of FSW joints is Fe₂O₃.

Key words： FSW joint X65 pipeline steel electrochemical property saturated CO₂

收稿日期: 2019-11-19

ZTFLH:

TG174.3

基金资助:北京市自然科学基金(3192013)

通讯作者: 高辉 E-mail: gaohui@bipt.edu.cn

Corresponding author: GAO Hui E-mail: gaohui@bipt.edu.cn

作者简介: 戴婷，女，1997年生，硕士生

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引用本文:

戴婷, 顾艳红, 高辉, 刘凯龙, 谢小辉, 焦向东. 水下摩擦螺柱焊接头在饱和CO₂中的电化学性能[J]. 中国腐蚀与防护学报, 2021, 41(1): 87-95.
Ting DAI, Yanhong GU, Hui GAO, Kailong LIU, Xiaohui XIE, Xiangdong JIAO. Electrochemical Performance of Underwater Friction Stud Welding Joint in CO₂ Saturated NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2021, 41(1): 87-95.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.237 或 https://www.jcscp.org/CN/Y2021/V41/I1/87

图1 FSW接头焊接实体和处理后的试件

图2 FSW接头经刻蚀后各区域金相图

图3 FSW接头硬度测试点示意图和分布图

图4 FSW和X65钢接头腐蚀不同时间的开路电位

图5 X65和FSW接头腐蚀不同时间的Nyquist和Bode图

图6 阻抗谱的等效电路图

表1 X65钢和FSW接头等效电路拟合结果

图7 X65钢和FSW接头腐蚀不同时间的Tafel图

表2 X65钢和FSW接头腐蚀不同时间的拟合结果

图8 X65钢试件腐蚀不同时间后的宏观金相图

图9 FSW接头腐蚀不同时间后的宏观金相图

图10 X65钢腐蚀不同时间后的微观金相

图11 FSW接头腐蚀8 h后各区域的金相图

图12 FSW接头腐蚀8 h的XRD谱

图13 FSW接头腐蚀8 h后腐蚀产物SEM像以及EDS分析结果

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