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Scientific Research An Academic Publisher. 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.
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Standard Guide for Examination and Evaluation of Pitting Corrosion
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ASTM Volume 11.03
ASTM G46 - 94(2018)