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Effects of temperature on the corrosion behaviour of X70 steel in CO2-Containing formation water
Gas Science and Engineering ( IF 5.285 ) Pub Date : 2021-01-20 , DOI: 10.1016/j.jngse.2021.103815
Xu Chen , Chengyuan Li , Nanxi Ming , Chuan He

The corrosion behaviour of X70 pipeline steel in CO2-containing formation water at various temperatures was studied in a high-temperature and high-pressure reactor via weight loss measurements, scanning electron microscope, X-ray diffraction, energy dispersive spectroscopy, and electrochemical methods. The concentrations of CO2 and ions in formation water at 30–150 °C were calculated. The equilibrium potentials of anodic and cathodic reactions were determined by thermodynamic equations, and the main cathode reaction was hydrogen ion reduction. X70 steel showed the uniform corrosion in the temperature range of 30 °C–90 °C and the localized corrosion at 120 °C and 150 °C. The supersaturation (S) was not proportional to the protection effect of FeCO3 scale. At 30 °C, the deposition rate of FeCO3 was too slow to form a protective film, so the corrosion rate was high. At 60 °C, the deposition rate of the FeCO3 was lower than the rate of film undermining and the corrosion product scale was non-protective. At 90 °C, although the S was the smallest, the FeCO3 scale was dense and protective. At 120 °C, the size of FeCO3 crystals increased significantly. A void space was formed between the grown grains and the matrix surface, whereas the immature grains still showed the good density and had the protection effect on the matrix. At 150 °C, the rapid growth of FeCO3 crystals led to the increase in the stress in the FeCO3 scale and the scale finally ruptured. H+ produced in the ionization reactions of H2CO3 and HCO3 resulted in local acidification and pitting corrosion.



中文翻译:

温度对X70钢在含CO 2的地层水中腐蚀行为的影响

通过重量损失测量,扫描电子显微镜,X射线衍射,能量色散谱和电化学方法研究了高温高压反应器中X70管线钢在不同温度下在含CO 2的地层水中的腐蚀行为。。计算了30–150°C下地层水中的CO 2和离子浓度。通过热力学方程式确定了阳极和阴极反应的平衡电位,主要的阴极反应是氢离子还原。X70钢在30°C–90°C的温度范围内显示均匀腐蚀,并在120°C和150°C的温度下显示局部腐蚀。过饱和度(S)与FeCO的保护作用不成正比。3规模。在30°C时,FeCO 3的沉积速率太慢而无法形成保护膜,因此腐蚀速率较高。在60°C时,FeCO 3的沉积速率低于膜破坏速率,并且腐蚀产物垢是非保护性的。在90°C下,尽管S最小,但FeCO 3的结垢致密且具有保护性。在120°C时,FeCO 3晶体的尺寸显着增加。在生长的晶粒与基体表面之间形成了空隙空间,而未成熟的晶粒仍显示出良好的密度并且对基体具有保护作用。在150°C下,FeCO 3晶体的快速生长导致FeCO中的应力增加3天平,天平终于破裂。ħ + H中的电离反应产生2 CO 3和HCO 3 -导致局部酸化和点蚀。

更新日期:2021-02-12
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