The effect of H2S concentration on the corrosion behavior of API 5L X-70 steel |
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Authors: | S. Arzola J. Genescá |
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Affiliation: | (1) Departamento de Ingeniería Metalúrgica, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510 Mexico City, D.F., Mexico |
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Abstract: | This work presents electrochemical data measured during the corrosion of API 5L X-70 pipeline steel immersed in aqueous environments containing dissolved H2S. Three different electrolyte were used: a 3 wt% NaCl solution containing 100, 650 and 2,550 ppm of H2S respectively. The corrosion of steel is described by means of electrochemical impedance spectroscopy. The electrochemical data obtained from the steel monitoring are presented in terms of Nyquist plots. The influence of the total H2S concentration as well as the effect of temperature on the corrosion of API 5L X-70 steel were also studied. In the presence of H2S the Rct values decrease as the H2S concentration increases. |
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Keywords: | Hydrogen sulfide in chloride solutions API 5L X-70 steel Corrosion Electrochemical impedance |
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