The aim of this work was to understand the synergistic effect of O₂ and H₂S on the corrosion behavior of N80 steel in a simulated high-pressure flue gas injection system. Weight loss measurements show that the presence of O₂ and an increase in temperature significantly accelerated the general corrosion rate of the N80 steel. We calculated a gray relational grade between different impact factors and the general corrosion rate from the results of an orthogonal experimental corrosion rate. The grade ranking of impact factors was: O₂ concentration (0.817) > temperature (0.706) > total pressure (0.689) > H₂S concentration (0.665) > CO₂ concentration (0.517). Surface characterization of corrosion scales was done using scanning electron microscopy, energy-dispersive spectroscopy, x-ray powder diffraction, and 3D optical microscope analysis. The results show that in the O₂-H₂S-CO₂-H₂O coexistence system the products were composed mainly of FeCO₃, FeS, Fe₂O₃, Fe₃O₄, and elemental sulfur. The results of the corrosion rate test and the characterization show that the presence of O₂ greatly accelerated the corrosion process and changed the corrosion mechanism. Elemental sulfur, which was generated by the reaction between the H₂S and the O₂, participated in the corrosion process of the N80 steel. It could be considered that the synergistic effect of O₂ and H₂S accelerated the corrosion of the N80 steel. In addition, the porous structures of the corrosion scales and the severe local pits show that the high content of O₂ inhibited the formation of FeCO₃ and aggravated the corrosion of N80 steel.

这项工作的目的是了解在模拟高压烟气喷射系统中O ₂和H ₂ S对N80钢腐蚀行为的协同作用。失重测量表明，O ₂的存在和温度的升高显着加速了N80钢的总体腐蚀速率。根据正交实验腐蚀速率的结果，我们计算了不同影响因素与一般腐蚀速率之间的灰色关联度。影响因素的等级排序为：O ₂浓度（0.817）>温度（0.706）>总压力（0.689）> H ₂ S浓度（0.665）> CO ₂浓度（0.517）。使用扫描电子显微镜，能量分散光谱，X射线粉末衍射和3D光学显微镜分析完成了腐蚀垢的表面表征。结果表明，在O ₂ -H ₂ S-CO ₂ -H ₂ O共存体系中，产物主要由FeCO ₃，FeS，Fe ₂ O ₃，Fe ₃ O ₄和元素硫组成。腐蚀速率测试和表征结果表明存在O ₂大大加速了腐蚀过程，改变了腐蚀机理。H ₂ S和O ₂之间的反应产生的元素硫参与了N80钢的腐蚀过程。可以认为O ₂和H ₂ S的协同作用加速了N80钢的腐蚀。此外，腐蚀垢的多孔结构和严重的局部凹坑表明，高含量的O ₂抑制了FeCO ₃的形成，并加剧了N80钢的腐蚀。