Abstract
An investigation into the electrochemical corrosion behavior of X80 pipeline steel under different elastic and plastic tensile stress in a CO2-saturated NaCl solution has been carried out by using open-circuit potential, potentiodynamic polarization, electrochemical impedance spectroscopy, and surface analysis techniques. The results show that the corrosion rate of X80 steel first increases and then slightly decreases with the increase of elastic tensile stress, whereas the corrosion rate sharply increases with the increase of plastic tensile stress. Both elastic and plastic tensile stress can enhance steel corrosion by improving the electrochemical activity of both anodic and cathodic reactions. Moreover, compared with elastic tensile stress, plastic tensile stress has a more significant effect. Furthermore, electrochemical reactions for CO2 corrosion and mechanoelectrochemical effect are used to reasonably explain the corrosion behavior of stressed X80 steel in CO2 environment.
Highlights
Pipeline has been acknowledged as a very efficient way for long-distance transportation of oil and natural gas due to its advantages of large transport capacity, low cost, and high reliability
This study aims to investigate the effect of different levels of elastic and plastic tensile stress on the corrosion behavior of the typical high-strength pipeline steel X80 in a CO2 -saturated NaCl solution
open-circuit potential test (OCP) first decreases andathen increases value with the increasing tensile stress, while fluctuation was observed in the beginning of immersion time, which indicates that the X80 steel under different tensile stress reached the thermodynamic stable state
Summary
Pipeline has been acknowledged as a very efficient way for long-distance transportation of oil and natural gas due to its advantages of large transport capacity, low cost, and high reliability. During the oil or natural gas extraction and transmission process, the aggressive impurities, especially carbon dioxide and chlorides, exist in produced oil and gas, and are unable to be completely removed. Such an environment would result in severe CO2 corrosion, which may reduce the service life of the pipeline and lead to the leakage of the pipeline [2]. Many studies so far have focused on corrosion of high-strength pipeline steels in oil and natural gas transportation environments [2,3,4,5,6,7,8,9,10,11]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
