Papers by Keyword: Tubular Steel

Abstract: There were little works about electrochemical corrosion behaviors that appeared in high H₂S and CO₂ containing environment. In this work, the electrochemical behaviors of tubular steel API-P110 in buffered acidic NaCl solutions saturated with high H₂S and CO₂ containing gases, were investigated by potentiodynamic sweep technique. Analysis of the results shows corrosion density declines with increasing CO₂ content in H₂S/CO₂. The corrosion potential of steel moves towards more negatively with the increase of CO₂ content in H₂S/CO₂. In pH 2.9 solution, Passivity appears in high H₂S and CO₂, but no passivity shows in due to decreasing in high H₂S. In pH 5.3 solution, cathodic liming density comes out and increases with the increasing CO₂ content in H₂S/CO₂, however, no cathodic liming density comes out in H₂S.

Abstract: In this work, the electrochemical transient behaviors of tubular steel API-P110 in buffered acidic NaCl solutions saturated with 50% H₂S and different content of CO₂ mixture gases, were investigated by single potential step chronoamperometry. Analysis of the results shows that fewer reactants take part in the reduction reaction when adding CO₂ content from 17% to 50% in 50% H₂S containing solution. Anions desorption process controls the reactant transferring process in metal-solution interface in the solution containing H₂S and CO₂. When at higher overpotential, anions desorption enhances and hydrogen absorption depresses with the increasing CO₂ content in H₂S/CO₂.