E3S Web Conf.
Volume 213, 20202nd International Conference on Applied Chemistry and Industrial Catalysis (ACIC 2020)
|Number of page(s)||4|
|Section||Energy Mining Research and Composite Material Performance Analysis|
|Published online||01 December 2020|
Corrosion Failure Cause Analysis of Buried Pipelines in Oil and Gas Stations
CNPC Engineering Technology Research Company Limited, Tianjin 300451, China;
2 Key Laboratory of Tubular Goods Engineering, CNPC-Research Division of Anti-Corrosion Coating and Thermal Insulation Structure, Tianjin 300451, China
* Corresponding author’s e-mail: firstname.lastname@example.org
Objective: To explore the failure cause of buried pipelines in an oil and gas station. Method: The chemical elements and metallographic structure of the failed pipes were analyzed to evaluate whether the pipe body meets the requirements of relevant standards; the morphology and composition of the corrosion products were analyzed to discover the cause of corrosion. Result: The metal surface was rough and full of pitting pits with severe localized corrosion, and no crack of the metallic matrix was found. The corrosion products mainly contain Fe3O4 and a small amount of FeCO3, wherein Fe3O4 is the secondary corrosion product formed in the air, and FeCO3 is the corrosion product of CO2 in an oil and gas environment. The surface of the corroded product is loose in structure and easy to peel off, leading to further corrosion of the metallic matrix. Conclusion: The pipeline corrosion failure was caused by CO2-induced corrosion failure in the medium.
© The Authors, published by EDP Sciences, 2020
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