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H2S/CO2分压比在0～0.6之间,在含有CO2和H2S的高温(120℃)饱和氯化物盐水条件下,实验评价了碳钢的腐蚀性。实验总结了在这些条件下形成的腐蚀产品膜的特征。腐蚀实验于流动回路中、在10m/s的流速下实施,相应的井内壁剪切应力是130Pa。在无H2S的试验条件下,未见保护膜形成,发现大于30mm/a的高的全面腐蚀速率。H2S/CO2溶液中腐蚀产物膜由几层不同的硫化铁组成,在一些情况下,还形成氧化铁和碳酸铁膜。当H2S/CO2比为0时,全面腐蚀速率为30～40mm/a;当H2S/CO2比在0.2～0.6之间时,全面腐蚀速率约为1mm/a。然而,随时间变化记录了略低的稳态腐蚀速率。H2S/CO2比在0.2时发生了坑蚀。
The H2S / CO2 partial pressure ratio is between 0 and 0.6. The corrosion of carbon steel was experimentally evaluated under high temperature (120 ° C) saturated chloride brine containing CO2 and H2S. The experiment summarizes the characteristics of the corrosion product film formed under these conditions. The corrosion test was carried out in a flow circuit at a flow rate of 10 m / s with a shear stress of 130 Pa on the inner wall of the corresponding well. In the absence of H2S, no protective film was formed and a high overall corrosion rate of greater than 30 mm / a was found. The corrosion product film in the H2S / CO2 solution consists of several layers of different iron sulphides, and in some cases iron oxide and iron carbonate films. When the H2S / CO2 ratio is 0, the overall corrosion rate is 30-40 mm / a. When the H2S / CO2 ratio is between 0.2-0.6, the overall corrosion rate is about 1 mm / a. However, slightly lower steady state corrosion rates were recorded over time. Pit corrosion occurred at a H2S / CO2 ratio of 0.2.