The effects of hydrogen on anodic dissolution and passivation of iron in alkaline solutions

Ejaz, Ahsan; Lu, Zhanpeng; Chen, Jun Jie; Xiao, Qian; Ru, Xiangkun; Han, Guangdong; Shoji, Tetsuo

doi:10.1016/j.corsci.2015.09.013

Cited by 44 publications

(17 citation statements)

References 56 publications

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“…The hydrogen evolution observed in cathodic branches was enhanced for the electrolytes containing ethanol. It was reported the effects of hydrogen absorbed on metal surfaces on anodic polarization in several aspects including retarding the formation of passivating film, changing the condition of electrode surface, decreasing the resistance toward charge transfer and ion diffusion, and increasing the capacitance 37 , 38 .…”

Section: Resultsmentioning

confidence: 99%

Ethanol as an electrolyte additive for alkaline zinc-air flow batteries

Hosseini

Han

Arponwichanop

et al. 2018

Sci Rep

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Zinc-air flow batteries exhibit high energy density and offer several appealing advantages. However, their low efficiency of zinc utilization resulted from passivation and corrosion of the zinc anodes has limited their broad application. In this work, ethanol, which is considered as an environmentally friendly solvent, is examined as an electrolyte additive to potassium hydroxide (KOH) aqueous electrolyte to improve electrochemical performance of the batteries. Besides, the effects of adding different percentages of ethanol (0–50% v/v) to 8 M KOH aqueous electrolyte were investigated and discussed. Cyclic voltammograms revealed that the presence of 5–10% v/v ethanol is attributed to the enhancement of zinc dissolution and the hindrance of zinc anode passivation. Also, potentiodynamic polarization and electrochemical impedance spectroscopy confirmed that adding 5–10% v/v ethanol could effectively suppress the formation of passivating layers on the active surface of the zinc anodes. Though the addition of ethanol increased solution resistance and hence slightly decreased the discharge potential of the batteries, a significant enhancement of discharge capacity and energy density could be sought. Also, galvanostatic discharge results indicated that the battery using 10% v/v ethanol electrolyte exhibited the highest electrochemical performance with 30% increase in discharge capacity and 16% increase in specific energy over that of KOH electrolyte without ethanol.

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Section: Resultsmentioning

confidence: 99%

Ethanol as an electrolyte additive for alkaline zinc-air flow batteries

Hosseini

Han

Arponwichanop

et al. 2018

Sci Rep

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“…The current environmentally assisted cracking (EAC) models for hydrogen embrittlement [74], do not incorporate, nor account for, the local chemical/electrochemical effects arising from the presence/exit of absorbed H. H, besides activating the anodic dissolution (this work), and promoting pit initiation/propagation [26, 27, 28, 29, 30, 31, 32, 33, 34], could also reduce a number of species in the electrolyte [24, 25]; with all these factors causing changes in local chemistry, and consequently impacting EAC. The threshold H concentration below which there is no significant effect of H on steel dissolution, is an important parameter which will need to be determined in future work.…”

Section: Resultsmentioning

confidence: 99%

“…Several researchers have shown that the kinetics of steel dissolution (as measured electrochemically) is apparently increased in hydrogen charged steels [26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39]. The presence of H also has been found to increase the corrosion of other systems, including pure Cr and Ni-Cr based systems [40, 41, 42].…”

Section: Introductionmentioning

confidence: 99%

“…Yuan et al [30] proposed that the release of atomic hydrogen from the steel (resulting in the ejection of H + ions in solution) decreases the local pH, making the passive film more prone to breakdown. Some researchers hypothesised that H could degrade the passive film formed upon steel, by different mechanisms [32, 33, 34, 35], while others claimed that absorbed H promotes a surface-cleaning effect, favouring enhanced anodic dissolution [31].…”

Section: Introductionmentioning

confidence: 99%

“…Such a technique, can definitively clarify whether it is indeed Fe dissolution, or H-oxidation (1) contributing to the enhanced anodic kinetics recorded from H charged steel samples. These tests were conducted in a non-passivating (acidic) electrolyte, to isolate the effect of H on steel dissolution from its well-known effects on passivity/passivity-breakdown [26, 27, 28, 29, 30, 31, 32, 33, 34, 35]. First principles modelling, on the effect of interstitial H on the local Fe—Fe metallic bonding was also carried out, to estimate the extent of H-driven decohesion, for its discussion with respect to Fe dissolution.…”

Section: Introductionmentioning

confidence: 99%

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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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Improved Stress Corrosion Cracking Resistance of High‐Strength Low‐Alloy Steel in a Simulated Deep‐Sea Environment via Nb Microalloying

Zhao

Fan

Zhao

et al. 2021

steel research int.

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Microstructure observations, thermal desorption spectroscopy (TDS) tests, hydrogen permeation measurements, electrochemical tests, and slow strain rate tensile (SSRT) tests are conducted investigate the beneficial effect of Nb microalloying on the stress corrosion cracking (SCC) behavior of high-strength low-alloy (HSLA) steels in a simulated deep-sea environment. The results show that the addition of Nb significantly decreases the SCC susceptibility of HSLA steel in a simulated deep-sea environment, and the role of Nb is attributed to microstructure optimization and the strong hydrogen-trap function of nanosized NbC precipitates with hydrogen activation energy up to 100.5 kJ mol À1 . In the simulated deep-sea environment, the SCC resistance of HSLA steel is enhanced by microstructure optimization and the hydrogen-trap function via Nb microalloying, and both anodic dissolution (AD) and hydrogen embrittlement (HE) are weakened. Moreover, the improvement of SCC resistance of HSLA steel with a higher hydrogen concentration via Nb microalloying is more obvious, in which the decrease of hydrogen-induced anodic dissolution (HIAD) and HE effects is more distinct, and the strong hydrogen-trap effect of NbC precipitates is the predominant mechanism to improve SCC resistance.

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The effects of hydrogen on anodic dissolution and passivation of iron in alkaline solutions

Cited by 44 publications

References 56 publications

Ethanol as an electrolyte additive for alkaline zinc-air flow batteries

Ethanol as an electrolyte additive for alkaline zinc-air flow batteries

The effect of absorbed hydrogen on the dissolution of steel

Improved Stress Corrosion Cracking Resistance of High‐Strength Low‐Alloy Steel in a Simulated Deep‐Sea Environment via Nb Microalloying

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