51316-7643-An Investigation into the Relevance of H2s:Co2 Gas Ratios on The Corrosion Behavior of X65 Carbon Steel

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Product Number: 51316-7643-SG

ISBN: 7643 2016 CP

Author: Frederick Pessu

Publication Date: 2016

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There have been increasing concerns related to the challenges posed by the consequences of H2S presence to the integrity oilfields pipeline steels. In environments containing variable amounts of both CO2 and H2S gas the corrosion behavior of carbon steel can be particularly complex. An understanding of the actual mechanisms sequence of electrochemical activities and impacts on the corrosion damage of carbon steel materials in these environments is still elusive. The film formation process characteristics and morphology in CO2 and H2S-containing systems are also known to be different influencing the general and pitting corrosion behavior of carbon steel differently. However questions still remain as to how the combined presence of CO2 and H2S gas at different combining ratios of partial pressure both influences the corrosion mechanisms as well as initiation of pitting corrosion. This paper presents an investigation into the overall corrosion behavior of carbon steel in CO2/H2S-containing environments. This work explores the impact of changes in ratios of partial pressures of CO2 and H2S gas at two different temperatures on the overall process of corrosion on carbon steel in NaCl brines. A pitting corrosion study is also conducted up to 168 hours based on changes in ratios of partial pressures of CO2 and H2S gas at two different temperatures. Corrosion film properties and morphology are studied through a combination of electrochemical and surface analysis techniques; scanning electron microscopy (SEM) and X-ray diffraction (XRD). The extent of corrosion damage of the carbon steel is evaluated through the implementation of surface interferometry to characterise pitting corrosion.KEY WORDS: Carbon dioxide corrosion hydrogen sulfide corrosion iron sulfide uniform corrosion pitting corrosion.