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51313-02792-Electrochemical Investigation of Hydrogen Diffusion in Pipeline Steels

Picture for Electrochemical Investigation of Hydrogen Diffusion in Pipeline Steels
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Product Number: 51313-02792-SG
ISBN: 02792 2013 CP
Author: Ehsan fallahmohammadi
Publication Date: 2013
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Hydrogen permeation through and hydrogen desorption from a carbon steel API 5L X65 and a low alloy ASTM A182 F22 steel membranes of various thickness have been studied by means of the electrochemical method developed by Devanathan and Stachurski. The anodic solution is 0.2 mol L-1 NaOH while the cathodic one is 0.2 mol L-1 sodium acetate plus 0.4 mol L-1 acetic acid. Tests have been carried out at two different temperatures 20 and 40°C.
Apparent H diffusion coefficient was measured in the 1st and 2nd permeation transient; lattice H diffusion coefficient was approximated with simple increase of cathodic charging current after long lasting build-up transient. Beside that Trapping binding energy of reversible traps was estimated using desorption technique. The elaboration of the results allowed to characterize the trapping parameters and comparing the results with suitable mathematical models.
The effects of some metallurgical features such as microstructure was evaluated studying hydrogen diffusion on the same materials in as received condition fully quenched and annealed conditions. Results were compared with API 5L gr B steel not specifically produced for sour service. Finite Element Method was used to analyse the reversible and ir-reversible trapping parameters from the first and subsequent build-up transients.
Some peculiarities and limitation like the electrochemical conditions of cathodic surface and presence of Palladium coating on the anodic side as regarded the usefulness of the permeation–desorption measurement for studying hydrogen in the steel sample membranes are given.
 

Hydrogen permeation through and hydrogen desorption from a carbon steel API 5L X65 and a low alloy ASTM A182 F22 steel membranes of various thickness have been studied by means of the electrochemical method developed by Devanathan and Stachurski. The anodic solution is 0.2 mol L-1 NaOH while the cathodic one is 0.2 mol L-1 sodium acetate plus 0.4 mol L-1 acetic acid. Tests have been carried out at two different temperatures 20 and 40°C.
Apparent H diffusion coefficient was measured in the 1st and 2nd permeation transient; lattice H diffusion coefficient was approximated with simple increase of cathodic charging current after long lasting build-up transient. Beside that Trapping binding energy of reversible traps was estimated using desorption technique. The elaboration of the results allowed to characterize the trapping parameters and comparing the results with suitable mathematical models.
The effects of some metallurgical features such as microstructure was evaluated studying hydrogen diffusion on the same materials in as received condition fully quenched and annealed conditions. Results were compared with API 5L gr B steel not specifically produced for sour service. Finite Element Method was used to analyse the reversible and ir-reversible trapping parameters from the first and subsequent build-up transients.
Some peculiarities and limitation like the electrochemical conditions of cathodic surface and presence of Palladium coating on the anodic side as regarded the usefulness of the permeation–desorption measurement for studying hydrogen in the steel sample membranes are given.
 

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