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The sewage from the No. 2 Combined Station of Tahe Oilfield has the characteristics of high salinity, high chloride ion concentration, high water temperature, and a small amount of H2S and CO2 gas, which is highly corrosive. Using dynamic corrosion weight loss, electrochemical, SEM, EDS and other test methods, the effect of high concentration of Cl− on the corrosion of 20# steel in wastewater containing H2S and CO2 was studied. The research shows that: in the sewage containing H2S and CO2, high concentration of Cl− has obvious promoting effect on the corrosion of 20# steel. Within the research range, no critical concentration that causes the rapid change of the corrosion rate of 20# steel has been found; The competitive adsorption and strong permeability of S2− obviously affect the structure of the corrosion product, and will cause a large area of the corrosion product film to fall off; with the increase of Cl− concentration, the falling off and formation of the 20# steel corrosion product film alternately occur, and the corrosion at the same time, the corrosion current showed a general trend of increasing, and the corrosion potential did not change significantly.

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Study on the Corrosion Behavior of Cl− on 20# Steel in High Salinity Wastewater Containing H2S and CO2

  • 会议论文

  • 发表日期：

    2026年

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  • Qiuying Gao,
  • Yaohui Yang,
  • Xueli Huang,
  • Qiang Liu,
  • Jun Ma,
  • Haijiao Sun,
  • Xudong Jia

摘要

The sewage from the No. 2 Combined Station of Tahe Oilfield has the characteristics of high salinity, high chloride ion concentration, high water temperature, and a small amount of H2S and CO2 gas, which is highly corrosive. Using dynamic corrosion weight loss, electrochemical, SEM, EDS and other test methods, the effect of high concentration of Cl− on the corrosion of 20# steel in wastewater containing H2S and CO2 was studied. The research shows that: in the sewage containing H2S and CO2, high concentration of Cl− has obvious promoting effect on the corrosion of 20# steel. Within the research range, no critical concentration that causes the rapid change of the corrosion rate of 20# steel has been found; The competitive adsorption and strong permeability of S2− obviously affect the structure of the corrosion product, and will cause a large area of the corrosion product film to fall off; with the increase of Cl− concentration, the falling off and formation of the 20# steel corrosion product film alternately occur, and the corrosion at the same time, the corrosion current showed a general trend of increasing, and the corrosion potential did not change significantly.