The current energy demand and the need to contain carbon dioxide emissions require the adoption of new energy vectors. Based on that, a progressively increasing percentage of gaseous hydrogen will be filled inside natural gas transportation pipeline systems, thus requiring a rigorous material compatibility assessment. It is well known how carbon and low alloy steels, may suffer hydrogen damage and hydrogen embrittlement, resulting in the reduction of toughness and ductility. The present study has been carried out in order to compare three different electrochemical methods to charge H into low-alloy steels (ASTM A 182 F22 and AISI 4140) samples presenting typical dimensions used for fracture mechanics tests. The study of the effect of different H recombination poisoners indicated As2O3 as the preferable choice in terms of H content and reproducibility.

Subject
Materials, Sodium acetate, Microstructure, Zinc anodes, Magnesium anodes, Acidity, Scatter, Metals, Steel, Acetic acid, Oxygen, Hydrogen, Low alloy steel
Keywords:
hydrogen, electrochemical charging, pipeline, carbon steel, recombination poisoners
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2023
Association for Materials Protection and Performance (AMPP)
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