Effect of Environmental Media on the Electrochemical Behavior of API X70 Pipeline Steel

This work investigates the corrosion behavior of X70 steel in different environments: sea sand, desert sand, mud and sea water. The principle of extracting solutions from these media consisted of mixing a soil material with distilled water, the mixture was agitated using an automatic agitator, which...

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Bibliographic Details
Published in:Journal of physics. Conference series 2021-03, Vol.1818 (1), p.12160
Main Authors: Gharbi, A., Benayad, B., Assala, O., Bouhamla, K., Ghelloudj, O., Chettouh, S., Remili, S., Bachiri, A.
Format: Article
Language:English
Subjects:
Charge transfer
Corrosion
Corrosion currents
Corrosion mechanisms
Corrosion resistance
Corrosion resistant steels
Distilled water
Electrochemical analysis
Electrode polarization
High strength low alloy steels
Media
Physics
Pitting (corrosion)
Sand
Seawater
Soil water
Structural steels
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Summary:This work investigates the corrosion behavior of X70 steel in different environments: sea sand, desert sand, mud and sea water. The principle of extracting solutions from these media consisted of mixing a soil material with distilled water, the mixture was agitated using an automatic agitator, which resulted in the extraction of solution. Potentiodynamic polarization and electrochemical impedance tests are used to characterize the samples in both media. The results show that the pipeline steel X70 has an excellent corrosion resistance in the sea sand solution, resulting in a low corrosion current density compared to other media. The impedance diagrams for both media are characterized by two capacitive loops, the first loop is attributed to charge transfer processes and the second loop is related to diffusion phenomena. The observation of corroded surfaces shows that the corrosion mechanism in different media is by pitting.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1818/1/012160