焊管2024，Vol.47Issue(2)：79-86,8.DOI:10.19291/j.cnki.1001-3938.2024.02.012
天然气立式排气管失效原因与机理分析
Failure Cause and Mechanism Analysis of Natural Gas Vertical Exhaust Pipe
唐定狼 1张建勋 1董志伟1
作者信息
- 1. 西安交通大学 金属材料强度国家重点实验室, 西安 710049
- 折叠
摘要
Abstract
In order to study the failure cause and corrosion mechanism of the vertical exhaust pipe of No.1 Gas Plant,the macroscopic corrosion morphology analysis,mechanical analysis,fracture morphology observation and corrosion product analysis were carried out for the exhaust pipe.Results indicate that the exhaust pipeline undergoes synergistic corrosion of CO2 and H2S.In failed natural gas pipelines,the content of S and C elements is relatively high,and the pipeline structure contains inclusions such as sulfides and carbides,which are the main reasons for pipeline corrosion.The S2-in the exhaust pipe combines with metal ions such as Fe2+ and Cr2+ to form acidic volatile sulfides,which hinder the growth of the passivation film.The acidified S2-further promotes the degradation of the protective film.Corrosion occurs when CO2,O2,and H2O come into contact with the pipeline,producing loose aggregated corrosion products that ultimately lead to pipeline corrosion.The research results can provide important reference for corrosion protection of natural gas pipelines.关键词
排气管/失效分析/腐蚀形貌/协同腐蚀/力学分析Key words
exhaust pipe/failure analysis/corrosion morphology/collaborative corrosion/mechanical analysis分类
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唐定狼,张建勋,董志伟..天然气立式排气管失效原因与机理分析[J].焊管,2024,47(2):79-86,8.
