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The effect of sorbed hydrogen on the corrosion potential of iron in acidic sulfate solutions

“…We used iron (C = 0.009%) membranes annealed in argon at 850 ° C for 1 h. The membrane thickness ( L ) was 150 µ m. On the working side of the membrane, we measured the cathodic current density or the iron corrosion potential by varying the cathodic current density ( i c , H ) on the hydrogenated side of the membrane. The experimental procedure is described elsewhere [1,2].…”

“…The coverage of electrode's working surface by hydrogen was estimated as follows: The method of determining constants k 1 , k 3 , and k and their numerical values in studied solutions are given in [1,2].…”

“…2, curve segment 142 S 2-). 1 Apparently, this insignificant effect is associated with the increase in the true surface area of the working side of membrane as a result of its plastic deformation at a given hydrogen concentration in the metal [2]. 1 For the procedures of measuring and calculating C and θ upon adding sulfide to the absorption part of the cell see [1].…”

“…We revealed the main correlations characteristic of the effect of sorbed hydrogen on the iron dissolution rate at a constant potential in a sulfate supporting electrolyte and when inhibiting the metal hydrogenation [1,2]. However, to completely describe the corrosion behavior of hydrated iron in acids, one must know how absorbed hydrogen affects the cathodic reaction rate and how the iron corrosion potential changes depending on the hydrogen concentration in the metal.…”

“…As we have shown earlier [1,2], the discharge of H + ions is the limiting stage of hydrogen cathodic evolution on iron in acidic sulfate solutions, i. e., the overall rate is described by the following equation:…”