Characterization of hydrogen permeation in armco-Fe during cathodic polarization in aqueous electrolytic media

The study of hydrogen permeation behavior in Armco-Fe showed that 0.1 M H ₂SO ₄ was a more effective medium for cathodic polarization compared to 0.1 M NaOH. When both electrolytes were "poisoned" with 1.00 g/L Na ₂HAsO ₄ • 7H ₂O, as hydrogen recombination inhibitor, the corresponding hydrogen permeation levels were 3.5 × 10 ^-5 A/cm ² in 0.1 M H ₂SO ₄ while 0.75 × 10 ^-5A/cm ² in 0.1 M NaOH. The breakthrough times were less than 30 s in 0.1 M H ₂SO ₄, while about 100 s in the NaOH. With varying amounts of "poisons", peak permeation of hydrogen (1.75 × 10 ^-5 A/cm ²) was achieved with 10 g/L Na ₂HAsO ₄ • 7H ₂O in 0.1 M H ₂SO ₄, while the least permeation resulted with 10 g/L (NH ₂CSH ₂) Thiourea addition for same level of 1.00 mA/cm ² cathodic polarization.