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Article

Corrosion Failure Mechanism of Associated Gas Transmission Pipeline

School of Materials Science and Engineering, China University of Petroleum, Qingdao 266580, China
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Author to whom correspondence should be addressed.
Materials 2018, 11(10), 1935; https://doi.org/10.3390/ma11101935
Received: 21 August 2018 / Revised: 24 September 2018 / Accepted: 1 October 2018 / Published: 11 October 2018
(This article belongs to the Special Issue Damage and Mechanical Properties of Steels)
Corrosion has been responsible for several gas pipeline leakage accidents; thus, clarifying its failure mechanisms is a precondition to prevent such accidents. On the basis of failure analysis of corroded pipe sections, laboratory exposure tests were conducted by simulating three possible corrosion environments inside a gas pipeline. The corrosion rate indicated by depth change was adopted in this study. Scanning electron microscopy and X-ray diffraction were used to analyze corrosion products. Results showed that the specimens completely immersed in condensate water were generally corroded and that the specimens exposed to gas were locally corroded. However, the corrosion rate of the latter was slightly lower; hence, no autocatalysis of occluded corrosion cell occurred in the formation of corrosion pit, and uniform corrosion occurred in the precipitation location of condensate water. The areas in the range of 5 mm below the waterline indicated severe corrosion, and the rate could reach twice that of other areas. The corrosion products were mainly FeO(OH) and FeCO3, thereby proving that the corrosion failure of pipelines was caused by oxygen absorption corrosion and CO2 corrosion. Suggestions were presented to control corrosion failure of associated gas pipelines. View Full-Text
Keywords: associated gas; corrosion; failure mechanism; gas pipeline associated gas; corrosion; failure mechanism; gas pipeline
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MDPI and ACS Style

Zhao, W.; Zhang, T.; Wang, Y.; Qiao, J.; Wang, Z. Corrosion Failure Mechanism of Associated Gas Transmission Pipeline. Materials 2018, 11, 1935. https://doi.org/10.3390/ma11101935

AMA Style

Zhao W, Zhang T, Wang Y, Qiao J, Wang Z. Corrosion Failure Mechanism of Associated Gas Transmission Pipeline. Materials. 2018; 11(10):1935. https://doi.org/10.3390/ma11101935

Chicago/Turabian Style

Zhao, Weimin, Timing Zhang, Yonglin Wang, Jianhua Qiao, and Zerui Wang. 2018. "Corrosion Failure Mechanism of Associated Gas Transmission Pipeline" Materials 11, no. 10: 1935. https://doi.org/10.3390/ma11101935

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