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

doi:10.11902/1005.4537.2019.237

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

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

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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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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

Received: 19 November 2019

ZTFLH:

TG174.3

Fund: Beijing Municipal Natural Science Foundation(3192013)

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

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Cite this article:

DAI Ting, GU Yanhong, GAO Hui, LIU Kailong, XIE Xiaohui, JIAO Xiangdong. 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.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2019.237 OR https://www.jcscp.org/EN/Y2021/V41/I1/87

Fig.1 Welding entity (a) and treated specimen (b) of FSW joint

Fig.2 Metallographic diagrams of plug rod (a), upper heat affected zone (b), weld seam (c), lower heat affected zone (d) and base metal (e) of initial FSW joint

Fig.3 Schematic diagram of test points on FSW joint (a) and corresponding measured values of hardness (b)

Fig.4 Open circuit potentials of X65 steel and FSW joint after immersion in CO₂ saturated NaCl solution for 2 h (a), 4 h (b), 6 h (c) and 8 h (d)

Fig.5 Nyquist (a1~a4) and Bode (b1~b4) plots of X65 steel and FSW joint after immersion in CO₂ saturated NaCl solution for 2 h (a1, b1), 4 h (a2, b2), 6 h (a3, b3) and 8 h (a4, b4)

Fig.6 Equivalent circuit diagram of EIS

Table 1 Fitting electrochemical parameters of EIS of X65 steel and FSW joint

Fig.7 Tafel diagrams of X65 steel and FSW joints corroded after immersion for 2 h (a), 4 h (b), 6 h (c) and 8 h (d)

Table 2 Fitting results of X65 steel and FSW joint after corrosion for different time

Fig.8 Macroscopic metallographic diagrams of X65 steel after immersion for 0 h (a), 2 h (b), 4 h (c), 6 h (d) and 8 h (e)

Fig.9 Macroscopic metallographic diagrams of FSW joint after immersion for 0 h (a), 2 h (b), 4 h (c), 6 h (d) and 8 h (e)

Fig.10 Microscopic metallographics of X65 steel after immersion for 0 h (a), 2 h (b), 4 h (c), 6 h (d) and 8 h (e)

Fig.11 Metallographic diagrams of FSW joint after corrosion for 8 h: (a) plug rod, (b) upper heat affected zone, (c) weld seam, (d) lower heat affected zone, (e) base metal

Fig.12 XRD pattern of FSW joint after corrosion for 8 h

Fig.13 SEM image (a) and EDS result (b) of corrosion products formed on FSW joint after corrosion for 8 h

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