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Electrochemical charging of H in sour simulated environment in steel

Fallahmohammadi, E ; Sharif University of Technology | 2011

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  1. Type of Document: Article
  2. Publisher: 2011
  3. Abstract:
  4. The hydrogen diffusivity and subsurface concentration (C app) were evaluated by fitting a series expansion of the diffusion equation to the permeation data. The hydrogen diffusivity in the steel was found to be approximately in a order of magnitude 10 -7 cm 2 s -1. The influence of the passive layer on the hydrogen permeation and its influence on the evaluation of diffusion and trapping characteristics were discussed. Hydrogen diffusion experiments in A106 GRB carbon steel pipeline were performed electrochemically at 25°C in NACE B, solution in various amount of sulphide ion concentrations. In this case the effect of concentration of sulphide ion evaluated by study the electrochemical behaviour of sample by the galvanostatic way. Generally, sulphur components were found to increase the hydrogen permeation rate. Presence of sulphide layer helped to absorption of hydrogen reduction and exacerbates the amount of hydrogen absorption in steel. This phenomenon can be noted that as regard to analysis of corrosion products which formed in the surface sample, the high amount of FeS, also hydrogen permeation test was prepared to evaluate the hydrogen diffusivity and permeation current behaviour of steel pipe sample
  5. Keywords:
  6. Electrochemical hydrogen permeation ; Hydrogen concentration ; Hydrogen diffusivity ; Pipeline
  7. Source: European Corrosion Congress 2011, EUROCORR 2011 ; Volume 4 , 2011 , Pages 2978-2988 ; 9781618394125 (ISBN)