Analysis on Influencing Factors of Hydrogen Sulfide Corrosion of X65 Pipeline Steel and Research on Protection Measures
The aim of this study was to investigate the inhibition efficiency of an imidazoline derivative preservative in CO2 corrosion of X65 pipeline steel containing iron carbonate deposits and hydrogen sulfide.In the oil and gas industry,the use of corrosion inhibitors is one of the common methods to control the corrosion of carbon steel in CO2 as well as H2S environments.Imidazoline derivatives were selected as corrosion inhibitors to protect the carbon steel surface by forming a protective film.A sample of API 5L X65 carbon steel was cut in a wet gas transfer pipeline.To evaluate the effectiveness of the preservative,Tafel polarization and electrochemical impedance spectroscopy tests were performed in mass fraction 3.5%NaCl solution saturated with CO2.The results showed that the presence of an iron carbonate film reduced the efficiency of the preservative.In addition,it was found that in the presence of H2S gas,the inhibition effect was reduced due to reduced adsorption of the preservative on the surface.
CorrosionCorrosion protectionH2S corrosionOil and gas pipelines
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