On-Line Measurement and Characterization of Electrochemical Corrosion of 304L Stainless Steel Pipe Wall in High-Speed Cl-Containing Solution

Fluid-induced metal corrosion failure is one of the main causes of pipe wall damage. In this paper, aimed at the corrosion failure of stainless-steel pipe wall in high-speed flowing liquid, a self-made micro three-electrode electrochemical test system was used to test the electrochemical characteris...

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Bibliographic Details
Published in:Metals (Basel ) 2022-08, Vol.12 (8), p.1324
Main Authors: Cheng, Jiarui, Yan, Qiqi, Pan, Zewei, Wei, Wenlan
Format: Article
Language:English
Subjects:
Austenitic stainless steels
Carbon steel
Chemical reactions
Corrosion
corrosion pattern
Corrosion rate
Corrosion tests
Electric properties
Electrochemical analysis
Electrochemical corrosion
Electrochemical reactions
electrochemical testing
Electrode polarization
Electrodes
Experiments
FAC
Failure analysis
Flow velocity
High speed
Life extension
Mathematical models
Measurement
miniature triple electrode
Morphology
Open circuit voltage
Pitting (corrosion)
Shear stress
Stainless steel
Steel
Steel pipes
Steel products
Steel, Stainless
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Summary:Fluid-induced metal corrosion failure is one of the main causes of pipe wall damage. In this paper, aimed at the corrosion failure of stainless-steel pipe wall in high-speed flowing liquid, a self-made micro three-electrode electrochemical test system was used to test the electrochemical characteristics of the pipe under different flow rates and different Cl− concentrations. In the experiment, the changes of open circuit potential, polarization curve and impedance spectrum of 304L stainless steel surface were obtained. At the same time, the corrosion rate of the material under different conditions was obtained by fitting. The results show that the corrosion rate varied non-linearly with increasing flow velocities. In addition, with the increase of Cl− concentration, the corrosion rate increased at a slower rate. The material surface under high concentration and high flow rate conditions was subject to physical cutting and electrochemical reactions, showing an activated and easy pitting corrosion state. The results of this study can provide data for failure analysis and life extension of pipelines and equipment in service.
ISSN:2075-4701
2075-4701
DOI:10.3390/met12081324