Investigations of the hydrogen evolution kinetics and hydrogen absorption by iron electrodes during cathodic polarization

Dafft, E.G.; Bohnenkamp, Konrad; Engell, Hans‐Jürgen

doi:10.1016/s0010-938x(79)80130-4

Cited by 50 publications

(5 citation statements)

References 9 publications

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“…The Volmer-Tafel mechanism for hydrogen evolution [67] is presented below (8)–(9).M + H 3 O + + e − → MH (ads) + H 2 OMH (ads) + MH (ads) → 2 M + H 2 …”

Section: Resultsmentioning

confidence: 99%

The effect of absorbed hydrogen on the dissolution of steel

Thomas

Ott

Schaller

et al. 2016

Heliyon

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Atomic hydrogen (H) was introduced into steel (AISI 1018 mild steel) by controlled cathodic pre-charging. The resultant steel sample, comprising about 1 ppmw diffusible H, and a reference uncharged sample, were studied using atomic emission spectroelectrochemistry (AESEC). AESEC involved potentiodynamic polarisation in a flowing non-passivating electrolyte (0.6 M NaCl, pH 1.95) with real time reconciliation of metal dissolution using on-line inductively coupled plasma-atomic emission spectroscopy (ICP-OES). The presence of absorbed H was shown to significantly increase anodic Fe dissolution, as evidenced by the enhanced detection of Fe2+ ions by ICP-OES. We discuss this important finding in the context of previously proposed mechanisms for H-effects on the corrosion of steels.

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“…The Volmer-Tafel mechanism for hydrogen evolution [67] is presented below (8)–(9).M + H 3 O + + e − → MH (ads) + H 2 OMH (ads) + MH (ads) → 2 M + H 2 …”

Section: Resultsmentioning

confidence: 99%

The effect of absorbed hydrogen on the dissolution of steel

Thomas

Ott

Schaller

et al. 2016

Heliyon

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“…Strong increase in cathodic current below −0.5 V and strong increase of anodic current above 0.9 V is observed for both, thin films and bulk material. In the cathodic range, the increasing cathodic current is mainly caused by three processes, namely (i) reduction of metal oxide, (ii) reduction of oxygen solved in non-deaerated electrolyte [55] and (iii) H + reduction and hydrogen evolution [56]. The anodic current is caused by metal oxidation also leading to dissolution, i.e.…”

Section: X-ray Fluorescence Analysismentioning

confidence: 99%

Studying the onset of galvanic steel corrosion in situ using thin films: film preparation, characterization and application to pitting

Garai

Solokha

Wilson

et al. 2021

J. Phys.: Condens. Matter

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This work reports about a novel approach for investigating surface processes during the early stages of galvanic corrosion of stainless steel in situ by employing ultra-thin films and synchrotron x-radiation. Characterized by x-ray techniques and voltammetry, such films, sputter deposited from austenitic steel, were found representing useful replicas of the target material. Typical for stainless steel, the surface consists of a passivation layer of Fe- and Cr-oxides, a couple of nm thick, that is depleted of Ni. Films of ≈4 nm thickness were studied in situ in an electrochemical cell under potential control (−0.6 to +0.8 V vs Ag/AgCl) during exposure to 0.1 M KCl. Material transport was recorded with better than 1/10 monolayer sensitivity by x-ray spectroscopy. Leaching of Fe was observed in the cathodic range and the therefor necessary reduction of Fe-oxide appears to be accelerated by atomic hydrogen. Except for minor leaching, reduction of Ni, while expected from Pourbaix diagram, was not observed until at a potential of about +0.8 V Cr-oxide was removed from the steel film. After couple of minutes exposure at +0.8 V, the current in the electrochemical cell revealed a rapid pitting event that was simultaneously monitored by x-ray spectroscopy. Continuous loss of Cr and Ni was observed during the induction time leading to the pitting, suggesting a causal connection with the event. Finally, a spectroscopic image of a pit was recorded ex situ with 50 nm lateral and 1 nm depth resolution by soft x-ray scanning absorption microscopy at the Fe L2,3-edges by using a 80 nm film on a SiN membrane, which is further demonstrating the usefulness of thin films for corrosion studies.

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“…Various mechanisms of the hydrogen absorption enhancement by promoters based on the results of hydrogen permeation tests have been proposed. 18) Beck et al 19) and Dafft et al 20) reported that the addition of NaCN, As 2 O 3 , SeO 2 , KI, and Na 2 S suppress the hydrogen recombination reaction and promote hydrogen absorption by increasing hydrogen surface coverage θ H . Bockris et al 21) reported that the addition of KSN, KI, and naphthalene enhances hydrogen penetration by decreasing the binding energy between hydrogen atoms and the metal surface.…”

Section: Effect Of Ammonium Thiocyanate On Hydrogen Absorption By Cat...mentioning

confidence: 99%

“… , ................ (1)  , ............ (2) ads  + , ......................... (3)where M is a metal atom and H ads is a hydrogen atom adsorbed on the metal surface. Some H ads is also absorbed by the HAR into the metal, as20,30)  , ............................ (4)…”

mentioning

confidence: 99%

Effect of Ammonium Thiocyanate on Hydrogen Absorption by Cathodic Charging in Weak Alkaline Solution

Kamisho,

Ishii,

Tsuda

2024

ISIJ Int.

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Investigations of the hydrogen evolution kinetics and hydrogen absorption by iron electrodes during cathodic polarization

Cited by 50 publications

References 9 publications

The effect of absorbed hydrogen on the dissolution of steel

The effect of absorbed hydrogen on the dissolution of steel

Studying the onset of galvanic steel corrosion in situ using thin films: film preparation, characterization and application to pitting

Effect of Ammonium Thiocyanate on Hydrogen Absorption by Cathodic Charging in Weak Alkaline Solution

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