The Mechanism of Hydrogen Evolution on Iron in Acid Solutions by Determination of Permeation Rates

Abstract

REVERSIBLE OXYGENarm pressure results in the formation of a gold oxide with a stable potential of 1.236v. That this is not the reversible oxygen potential is shown by Fig. 8 which shows the effect of partial pressure changes. The potential changes do not follow the Nernst equation. It therefore appears unlikely that a reversible oxygen electrode can be established on gold or gold oxide substrates.We thank Professor J. O'M. Bockris and Miss W. Visscher for discussions. One of us (N.W.) wishes to thank the Council of Kyoto University for leave of absence.

Inhibition effect of underpotential deposition of metallic cations on aqueous corrosion of metals

“…Rashkov et al (1988) investigated the relation between Zn-UPD and penetration of hydrogen in Armco iron. The Devanathan-Stachurski method (Devanathan & Stachurski, 1962, 1964 was used for the measurement of hydrogen penetration rate through a bipolar iron membrane. The electrolytes employed in the cathodic compartment for hydrogen evolution were deaerated 1 m Na 2 SO 4 + 0.2 m NaCl + 0.5 m H 3 BO 3 solutions without and with 10 −3 m-1 m ZnSO 4 .…”

“…The presence of Zn 2+ also decreased the oxidation current of the atomic hydrogen in the anodic compartment, indicating that the Zn-UPD on Armco iron inhibits both the hydrogen evolution and the penetration of atomic hydrogen. Popov et al (1994a) also investigated the effect of Zn-UPD on hydrogen absorption and penetration into HY-130 steel by using the Devanathan-Stachurski method (Devanathan & Stachurski, 1962, 1964. The electrolytes employed in the cathodic compartment for hydrogen evolution were deaerated 1 m Na 2 SO 4 + 0.4 m NaCl + 0.4 m H 3 BO 3 solutions without and with 2 × 10 −3 m ZnSO 4 .…”

“…However, the inhibition effect of Zn 2+ was observed up to potentials more positive than the potential region of Zn-UPD, which was ascribed to the shift in anodic stripping potential of Zn toward the positive direction due to irreversible electro-deposition of Zn or due to alloy formation of Zn with substrate steel. Zheng et al (1993) investigated the effect of Pb 2+ on hydrogen evolution and permeation into AISI 4340 steel in deaerated 0.5 m HClO 4 + 0.25 m NaClO 4 solution by using the Devanathan-Stachurski method (Devanathan & Stachurski, 1962, 1964. Two characteristic cathodic current peaks at −0.15 V and −0.24 V which correspond to the UPD and bulk deposition of Pb, respectively, appeared during cyclic voltammetry of AISI 4340 steel in solution with 2 × 10 −3 m Pb 2+ .…”

Effect of the structure of o,o´-dihydroxyazo compounds on bactericidal and inhibitory ability

“…For estimation of hydrogen permeation into the metal, a two-chamber cell with a vertical steel membrane ( Figure 2) similar to the Devanathan cell [29,30] was used. Carbon steel membrane with an exposed area of 3.63 cm 2 and a thickness of 300 µm was used.…”

Challenges in hydrogen quantification using Kelvin probe technique at different levels of relative humidity

“…Standard methods for hydrogen detection in metals are the Devanathan-Stachurski cell, which provides information about the diffusion constants of hydrogen in metals and density of trap sites [21,22] or thermodesorption technique [23].…”