建筑用J55管线钢在二氧化碳高温高压条件下的腐蚀行为分析

Analysis on Corrosion Behavior of J55 Pipeline Materials in Condition of High Pressure Carbon Dioxide at High Temperature

研究了二氧化碳在高压条件下,温度对化工建筑用J55合金腐蚀行为的影响,并分别将腐蚀后的试件进行XRD衍射检测和扫描电镜观察,探究并证明二氧化碳温度对J55合金材料腐蚀行为的影响。实验结果表明:25~65℃温度范围内J55合金腐蚀速率会随温度的增加而呈递增趋势;将模拟结果进行拟合,也得到J55合金的腐蚀速率随温度的增加而呈递增趋势;升高温度能够加快膜内钙离子和镁离子的沉积,最终在高温条件下聚集成铁、钙、镁形成的复合盐,进而改变腐蚀产物膜的结构,最终促进了垢下腐蚀速率。

The effect of temperature on corrosion behavior of J55 alloy used for chemical building was investigated under the carbon dioxide high pressure condition, the XRD diffraction detection and scanning electron microscope were conducted to the specimens after corrosion. The influence of carbon dioxide temperature on corrosion behavior of J55 alloy was explored and proved. The experimental results show that the J55 alloy corrosion rate increases with the increase of temperature at the range of 25~65 ℃. The simulation results are also obtained by fitting, the corrosion rate of J55 alloy increases with the increase of temperature. Increasing the temperature can accelerate the deposition of calcium ion and magnesium ion in the film, final, gathering as compound salt with Fe, Ca and Mg to change the film's structure was changed and accelerate the corrosion rate under scale.