There have been many attempts to measure the diffusivity and permeability of hydrogen in the steel under tensile straining condition using the electrochemical hydrogen permeation technique (HPT). However, the different experimental conditions relating to strain rate and applied electrochemical parameters often lead to unrealistic data. In this work API(1) X65 grade linepipe steel having a high sulfide stress cracking (SSC) resistance was used and most experimental conditions were determined according to the ISO170811  standard. NACE-A solution was selected as the hydrogen charging solution according to the NACE procedure TM0177A2 . Applied stresses were smaller than threshold stress to avoid failure of the specimen. In this study, the permeability, apparent diffusivity, apparent solubility of diffusible hydrogen and the amount of irreversibly trapped hydrogen was measured by a modified HPT, and were are correlated with the SSC resistance to investigate the role of hydrogen in causing SSC.

Subject
Hydrogen permeation, Electrochemical cells, Microstructure, Permeability, Diffusible hydrogen, Solubility, Mechanical failure, Steel, Hydrophobic interaction chromatography, Sulfide stress cracking, Hydrogen, Oxidation, Inclusions
Keywords:
linepipe steel, sulfide stress cracking, electrochemical hydrogen permeation technique, hydrogen trapping
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2010
Association for Materials Protection and Performance (AMPP)
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