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96606 THE ROLE OF ENVIRONMENTAL PARAMETERS ON THE SEVERITY OF HYDROGEN CHARGING IN WET H2S ENVIRONMENTS

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Product Number: 51300-96606-SG
ISBN: 96606 1996 CP
Author: D. Abayarathna, R. D. Kane
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The focus of this study was to simulate alkaline sour media, representative of some refinery environments, and to study of the effect of hydrogen sulfide (H2S), ammonia (NH3) and cyanide (CN-) on the severity of hydrogen charging in steel using electrochemical hydrogen permeation and polarization techniques. A limited number of measurements were made in the standard NACE TMO177-90A and TM0284 acidic sour solutions. Results in the alkaline sour environments indicated an increase in the corrosion and permeation rates with increasing pH and bisulfide (HS-) concentration. In the presence of H2S, the CN- ions maintained the corrosiveness of the environment by dissolving the protective iron sulfide film. However, no significant effect of CN- was observed in the absence of H2S. An important observation from the study was the shift in corrosion potential in the active direction with the establishment of corrosive conditions which can be utilized as a corrosion monitoring tool together with pH value.

The focus of this study was to simulate alkaline sour media, representative of some refinery environments, and to study of the effect of hydrogen sulfide (H2S), ammonia (NH3) and cyanide (CN-) on the severity of hydrogen charging in steel using electrochemical hydrogen permeation and polarization techniques. A limited number of measurements were made in the standard NACE TMO177-90A and TM0284 acidic sour solutions. Results in the alkaline sour environments indicated an increase in the corrosion and permeation rates with increasing pH and bisulfide (HS-) concentration. In the presence of H2S, the CN- ions maintained the corrosiveness of the environment by dissolving the protective iron sulfide film. However, no significant effect of CN- was observed in the absence of H2S. An important observation from the study was the shift in corrosion potential in the active direction with the establishment of corrosive conditions which can be utilized as a corrosion monitoring tool together with pH value.

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