Electrochemical and surface analytical studies on hydrogen permeation with Fe-Cu alloys in sulfuric acid with and without H2S

Kato, Chiaki; Grabke, H. J.; Egert, B.; Panzner, G.

doi:10.1016/0010-938x(84)90077-5

Cited by 37 publications

(21 citation statements)

References 20 publications

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“…The enhancement of corrosion resistance of TWIP steel by the presence of Cu on the surface is related to the alteration of the reaction mechanism by catalyzing the hydrogen recombination at the sample/solution interface [26]. The results of Dieudonne et al were consistent with other reports [29,30], in which similar behaviour of Cu in steels was found. Hermas et al [31], however, pointed out that Cu improves the local corrosion resistance of austenite stainless steels through the redeposition of previously dissolved Cu, and the accumulation of the metallic Cu on the surface with the formation of insoluble cuprous chloride (CuCl) protects the alloy against corrosion.…”

Section: Discussionsupporting

confidence: 89%

Regulating the passive film of NiCoCrMo alloy in hydrofluoric acid solution by small addition of Cu

Hou

et al. 2015

Corrosion Science

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Section: Discussionsupporting

confidence: 89%

Regulating the passive film of NiCoCrMo alloy in hydrofluoric acid solution by small addition of Cu

Hou

et al. 2015

Corrosion Science

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“…Data analysis using the basic I-P-Z modeL--The basic I-P-Z model developed above is tested for various literature data (2,3,6,18) …”

Section: Resultsmentioning

confidence: 99%

“…Using assumption 3, the steady-state permeation flux or current is given by [3] where D~ = the bulk diffusivity of hydrogen in the metal, L = the thickness of the metal membrane, and c~ = the concentration of hydrogen in the metal adjacent to the surface. From Eq.…”

Section: Theoreticalmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of Hydrogen Evolution and Entry into Metals for the Discharge‐Recombination Process

Iyer¹,

Pickering²,

Zamanzadeh³

1989

J. Electrochem. Soc.

150

130

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A mechanistic model has been developed which for the first time considers the effect of hydrogen entry into a metal on the kinetics of the hydrogen evolution reaction (h.e.r.). The model enables computation of (i) the hydrogen surface coverage and surface concentration; (ii) the hydrogen adsorption, absorption, discharge and recombination rate constants; and (iii) the h.e.r, coverage-dependent transfer coefficient, ~, and the exchange current density io, from a knowledge of the steady-state hydrogen permeation current, cathodic charging current, hydrogen overvoltage, and hydrogen diffusivity. The model predicts a linear relationship between the permeation flux and the square root of the hydrogen recombination flux, and provides an analytical method to determine the cathodic potential range for operation of a coupled dischargerecombination mechanism of the h.e.r. With modifications the model can treat permeation data for which (i) the mechanics of the discharge step involve a (proposed) selvedge reaction, and (ii) surface hydrogen coverages are relatively high as in the presence of poisons (e.g., H2S or As2OD. Some of the existing literature data for hydrogen permeation in iron and nickel in acid and alkaline solutions are successfully analyzed.Hydrogen is one of the most damaging species in metals, causing hydrogen assisted cracking, blisters, and similar phenomena. Hydrogen entry into metals from aqueous solutions has been studied extensively by hydrogen permeation experiments of thin samples using the DevanathanStachurski cell (1-7). Some studies carried out on iron in acid and alkaline solutions (2, 4, 6) reveal a coupled discharge-recombination mechanism for the hydrogen evolution reaction (h.e.r.) with diffusion of absorbed hydrogen into the metal being rate controlling for the permeation process. The models based on this mechanism predict a square-root relationship between the hydrogen charging current and the steady-state hydrogen permeation flux or current (2). In all of these models, it has been assumed that the hydrogen permeation flux is negligible. It has also been assumed that the hydrogen coverage (Os) is quite low, although the coverage itself is unknown. However, especially when poisons such as H2S or As~O3 are present in the solution, both the permeation current and the hydrogen coverage can be appreciable (8,9). If the steady-state permeation current (i~) is proportional to the square root of the charging current (and the Tafel slope is -120 mV decade -~ and d~l/d log i~ is -240 mV decade -~ where ~1 is the overpotential for the h.e.r.), the h.e.r, is generally considered to follow a coupled diseharge-reeombinati0n mechanism. Apart from these considerations which have not produced operative models yielding the relevant parameters, e.g., 0s, the current models also do not explain the mechanics of the intermediate reaction between adsorption and absorption of hydrogen in metals, which is probably correctly assumed in many eases, but perhaps not in all, to be in equilibrium at the cathode surface.T...

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“…(14) ( (18) Equations (14) to (18) derives the following formulae, The relation between the two parameters was confirmed by several reports. 17,[19][20][21] Here, the present permeation data was analyzed to confirm the relation between i H (t = ∞) and i c 1/2 , and i H (t = ∞) was changed into C 0 by Eq. (5).…”

Section: Hydrogen Absorption Rate Depending On Additional Elements Ofmentioning

confidence: 99%

Effect of Additional Element on Hydrogen Absorption for Iron in Acidic and Neutral Sulfate Solutions

et al. 2016

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Electrochemical and surface analytical studies on hydrogen permeation with Fe-Cu alloys in sulfuric acid with and without H2S

Cited by 37 publications

References 20 publications

Regulating the passive film of NiCoCrMo alloy in hydrofluoric acid solution by small addition of Cu

Regulating the passive film of NiCoCrMo alloy in hydrofluoric acid solution by small addition of Cu

Analysis of Hydrogen Evolution and Entry into Metals for the Discharge‐Recombination Process

Effect of Additional Element on Hydrogen Absorption for Iron in Acidic and Neutral Sulfate Solutions

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