X70钢输送气态和超临界状态CO2时的腐蚀行为研究
orrosion Behavior of X70 Mild Steel during Transportation of Gaseous- and Supercritical-CO2 Fluids
采用失重法和SEM等方法研究了在管道内存在析出水的情况下，输送气态和超临界状态CO2时X70钢的腐蚀行为。结果表明：在35℃，CO2的压力为4~12MPa条件下，X70钢的均匀腐蚀速率随压力的增加而逐渐降低；当CO2压力为4MPa时，金属表面出现了明显的FeCO3沉积，发生了严重均匀腐蚀；在其它压力条件下，金属表面腐蚀产物膜很薄并不连续，发生了小孔腐蚀；从腐蚀角度，存在水的情况下采用气态或超临界状态输送CO2均存在较严重的腐蚀风险。
he corrosion behavior of X70 mild steel was investigated in the case of water deposited in CO2 pipeline by means of weight loss method and scanning electron microscopy (SEM). Results showed that general corrosion rate of X70 steel decreased with the increase of CO2 pressure from 4 to 12 MPa at 35 . FeCO3 film and severe general corrosion was observed at 4 MPa, while thin and discontinuous corrosion product and serious pitting corrosion attack were found under other CO2 pressure conditions. It is of great corrosion risk to transport CO2 in gaseous or supercritical status for X70 mild steel if free water is formed in the pipeline.
刘小辉、蒋秀、屈定荣、宋晓良
石油天然气储运冶金技术
气态超临界状态O2腐蚀X70钢
刘小辉,蒋秀,屈定荣,宋晓良.X70钢输送气态和超临界状态CO2时的腐蚀行为研究[EB/OL].(2023-03-31)[2025-08-02].https://chinaxiv.org/abs/202303.10455.点此复制
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