Rates of hydrogen evolution and hydrogen absorption were determined by use of membrane experiments in environments simulating soil conditions. The objective of this work was to determine the amount of hydrogen absorbed by steel under various conditions encountered by cathodically protected pipelines. The conditions investigated included a pH range of 3 to 9, absence of and saturation by oxygen, effects of cathode poisons, and metal-to-soil potentials. For a given pipe-to-soil potential, the rate of hydrogen penetration of steel is decreased by the presence of oxygen and arsenic, and increased by the presence of sulfide.

Subject
Electric current, Steel surfaces, Hydrogen concentration, Diffusion, Constants, Sulfide concentration, Steel, Electric potential, Oxygen, Sulfides, Electrodes, Electrode potential, Hydrogen
© 1968 National Association of Corrosion Engineers
1968
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