Effect of Flow Velocity on Flow Accelerated Corrosion Rate of Carbon Steel Elbow

doi:10.11902/1005.4537.2022.319

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (5): 1064-1070 DOI: 10.11902/1005.4537.2022.319

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Effect of Flow Velocity on Flow Accelerated Corrosion Rate of Carbon Steel Elbow

PAN Dailong, SI Xiaodong(

), LV Jinhong

School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212100, China

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Abstract

Carbon steel is the main material for power plants, oil and gas pipelines. Flow accelerated corrosion is the main factor causing pipeline failure in power plants, especially the secondary circuit pipeline system of the pressurized water reactor (PWR) nuclear power plant. In this paper, a home-made flow accelerated corrosion test rig and array electrode technology was used to study the effect of different flow rates on the flow accelerated corrosion rate distribution of 20# carbon steel elbow at 120 °C. The correlation between hydrodynamic parameters and corrosion rate was analyzed based on hydrodynamic simulation. The results show that the maximum corrosion current density is located at the external bending side of the elbow at different flow rates. With the increase of flow velocity, the flow accelerated corrosion rate increased significantly. In addition, the comparison of experimental data and simulation results show that the radial local velocity component can be used as an important parameter to predict the flow accelerated corrosion rate of carbon steel elbow. The empirical formula between the radial local velocity component and the corrosion rate was obtained by fitting based on the least square method. This research can be applied to design optimization, operation monitoring and maintenance strategy formulation of carbon steel elbow transport lines in thermal power, nuclear power and chemical industries.

Key words: elbow flow accelerated corrosion electrochemistry numerical simulation hydrodynamics

Received: 17 October 2022 32134.14.1005.4537.2022.319

ZTFLH:

TG174

Fund: Innovation and Entrepreneurship Program of Jiangsu Province(JSSCBS20210994)

Corresponding Authors: SI Xiaodong, E-mail: Xiaod_Si@163.com

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Cite this article:

PAN Dailong, SI Xiaodong, LV Jinhong. Effect of Flow Velocity on Flow Accelerated Corrosion Rate of Carbon Steel Elbow. Journal of Chinese Society for Corrosion and protection, 2023, 43(5): 1064-1070.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2022.319 OR https://www.jcscp.org/EN/Y2023/V43/I5/1064

Fig.1 High temperature loop test system diagram

Fig.2 Schematic diagram of array electrode installation (a) and measuring point distribution (b) in test section

Fig.3 Nyquist plots of typical array electrodes in elbow section at 1 m/s (a), 2 m/s (b), 3 m/s (c) and 4 m/s (d)

Fig.4 Equivalent circuit used for EIS fitting

Fig.5 Charge transfer resistance (a) and corrosion current density (b) of array working electrode in elbow test section at different flow rates

Table 1 Charge transfer resistance and corrosion current density at different flow rates of the typical position array working electrode

Fig.6 Comparison of velocity (a), wall shear (b), turbulence kinetic energy (c), axial local velocity (d) and corrosion current density

Fig.7 Comparison of radial local velocity and corrosion current density between intrados (a) and extrados (b)

Fig.8 Comparison of radial local velocity and corrosion current density at 1 m/s (a), 2 m/s (b), 3 m/s (c) and 4 m/s (d)

Fig.9 Fitting relationship between corrosion current density and Vr at different flow rates in elbow test section

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