Corrosion Behavior of API 5L X52 Steel under High Concentrations of H<sub>2</sub>S/CO<sub>2</sub> Gases

Abstract

In the present work, the susceptibility of API 5L X52 steel to corrosion processes was evaluated in the presence of high contents of hydrogen sulfide and carbon dioxide. Gravimetric tests and surface analyses were carried out to establish both the corrosion rate and damage type exhibited by the metal. The obtained results indicate that the hydrogen sulfide is the most active gas in the corrosion processes that took place, quite above carbon dioxide. The main observed corrosion products were iron sulfides and the typical damage associated with hydrogen sulfide presence was Sulfide Stress Cracking (SSC). The surface damage evidences the presence of cracks with considerable magnitude and metal loss as consequences of the corrosion processes. Likewise, the presence of oxygen in the system modifies the displayed corrosion type, where corrosion products such as iron oxides and reduction in the number and extent of cracks are observed. On the other hand, the addition of a film-forming corrosion inhibitor based on modified imidazolines eliminates completely the development of cracks, although under certain test conditions, it can favor localized pitting corrosion.

The Influence of Rotating Cage Geometry and Baffles on the Wall Shear Stress Equation in Sweet/Sour Corrosion

“…When CO 2 and H 2 S hydrates inside the wells, it dissociates and forms carbonic acid and hydrogen sulfide ionization species 11 . Then, iron carbonate (FeCO 3 ) and/or iron sulfide (FeS) films formed on the anodic steel surface, can reduce the kinetics of corrosive processes 10,12 , or presenting non-protective characteristics, inducing new corrosion mechanisms in the system 13 .…”