Study of Electrochemical Behavior, Hydrogen Permeation and Diffusion in Pipeline Steel

Swapna Dey; Seetharaman Sivaprasad; Nityananda Das; Indranil Chattoraj

doi:10.4028/www.scientific.net/MSF.1019.145

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HomeMaterials Science ForumMaterials Science Forum Vol. 1019Study of Electrochemical Behavior, Hydrogen...

Study of Electrochemical Behavior, Hydrogen Permeation and Diffusion in Pipeline Steel

Abstract:

The pipeline steels which are used for transportation of natural gas and crude oil suffer from hydrogen damage at their internal as well as external surfaces. The internal surfaces of pipelines are generally affected due to hydrogen induced cracking and the external surfaces due to the soil environmental conditions which cause stress corrosion cracking. In the present investigation, the electrochemical corrosion behavior of X70 pipeline steel was studied in sour environment and near neutral soil environment. To assess the mechanism of hydrogen damage in steel, electrochemical hydrogen charging and permeation techniques were used to characterize the hydrogen distribution, trapping and its diffusion in X70 pipeline steel. It has been found that corrosion behavior of pipeline steel in the sour environment is higher than the near neutral soil solution. From the hydrogen permeation study it is established that the hydrogen permeation rate increases with the square root of the charging current density, and the increase of hydrogen flux is directly proportional to the subsurface hydrogen concentration.

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Periodical:

Materials Science Forum (Volume 1019)

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145-156

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.1019.145

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Online since:

January 2021

Authors:

Swapna Dey*, Seetharaman Sivaprasad, Nityananda Das, Indranil Chattoraj

Keywords:

Diffusion, Hydrogen Charging, Hydrogen Permeation, Pipeline Steel

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