Experimental and numerical investigation into the corrosion performance of X100 pipeline steel under a different flow ra
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ORIGINAL PAPER
Experimental and numerical investigation into the corrosion performance of X100 pipeline steel under a different flow rate in CO2-saturated produced water Shengnan Wang 1 & Jie Zhao 1
&
Yanhong Gu 1 & Dan Xiong 1 & Qunfeng Zeng 2 & Bin Tian 3
Received: 16 February 2020 / Revised: 29 August 2020 / Accepted: 10 November 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The effect of flow velocity on the corrosion behavior of X100 steel in CO2-saturated produced water (CO2-SPW) was studied. Potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) were used to study the corrosion behavior of X100 steel. X-ray diffraction (XRD), a metallurgical microscope, and a scanning electron microscope (SEM) were used to analyze corrosion product composition and morphology, respectively. The results show that the corrosion current density increases and impedance value decreases with the increase of the flow rate. The corrosion products are mainly FeCO3 and Fe3C. The corrosion degree of the bend segment is more serious than that of the straight segment. COMSOL simulation proposed the correlation between X100 corrosion behavior and material concentration and flow field distribution. A corrosion model was proposed, where the corrosion mechanism of X100 under simulated working condition was explained. Keywords Dynamic corrosion . X100 . flow rate . COMSOL simulation
Introduction The development of high-strength steel pipelines is of great economic importance to oil industry and unconventional well drilling [1–3]. As a relative new-grade pipeline steel, X100 steel has gained growing concerns recently [4, 5]. It possesses superior combination performances of strength, ductility, and corrosion resistance [6, 7]. However, the flow state in engineering is complex, the pipeline steel is normally employed under dynamic conditions [8, 9], and the
* Jie Zhao [email protected] * Yanhong Gu [email protected] 1
School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, 19 QingyuanBeilu, Huangcun, Daxing District, Beijing 102617, China
2
Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, Xi’an Jiaotong University, Xi’an 710049, China
3
School of Material and Mechanical Engineering, Beijing Technology and Business University, Beijing 100048, China
corrosion of the pipeline usually poses great threat under flow condition [10–12]. Several investigations on the dependence between the fluid velocity and corrosion rules are available in the literature [8, 13–17]. Tao Liu [18] studied the corrosion behavior of X70 in the produced water of oil field, founding that the velocity would affect the formation of corrosion product film, and the sudden change of velocity would lead to the transient pressure instability in the pipeline [19]. Mahdiet et al. [20] investigated the pitting corrosion of X100 steel by increasing the electrolyte erosion speed. The results show that pitting potentials shift towards more negative, from −
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