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- Title
基于试验的天然气集输管道失效性机理分析.
- Authors
何海洋; 王钰文; 陈林燕; 李星蓉
- Abstract
The corrosion failure behavior of a natural gas gathering and transportation pipeline was examined. The corrosion morphology characteristics and product composition of the pipeline were also determined, as were the corrosion failure characteristics, corrosion types, and failure mechanism. The failure analysis of pipeline was made by taking an experimental research as the primary means. The corroded parts and macroscopic features of the inner wall of the pipeline ware analyzed through macroscopic surface measurement. The pipeline materials was tested,such as mechanical properties, microhardness, chemical composition and metallographic analysis. Scanning electron microscopy ( SME) was used to analyze the morphology of the corrosion products. Energy dispersive spectroscopy ( EDS) and X-ray diffraction ( XRD) were used to analyze the phase of the corrosion products. The results show that the matrix's chemical composition and mechanical properties meet the national standard and the typical metallographic structure. CO2 corrosion occurred in pipeline steel L245 in a high salinity water environment, forming loose, porous, cracked corrosion products in clusters. The main components of the corrosion product are FeCO3 and Fe2O4 . Due to the low bonding strength between the corrosion product film and the metal matrix, it is easy to strip under the action of the erosion of the fluid medium, accelerating the dissolution of metal and the diffusion of corrosive substances, and forming electrochemical corrosion with autocatalytic effect.
- Publication
Science Technology & Engineering, 2023, Vol 23, Issue 35, p15044
- ISSN
1671-1815
- Publication type
Article