Hydrogen generation using the corrosion of Al-Sn and Al-Si alloys in an alkaline solution

Yoo, Jeong-Hyun; Yun, Kwi-Sub; Kalubarme, Ramchandra S.; Park, Chan‐Jin

doi:10.1007/s12540-014-4006-1

Cited by 18 publications

(5 citation statements)

References 30 publications

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“…According to the results from [ 79 ], an increase in the Si content unexpectedly resulted in a decrease in the hydrogen yield; that was attributed to the formation of SiO 2 , which slowed down the elimination rate of the passivation oxide film since it was harder to remove than Al 2 O 3 . In other studies [ 45 , 48 , 80 , 81 , 82 ], however, aluminum alloying with Cu, Fe, Si, and Mg was found to be profitable. From the examples given above, a conclusion could be drawn that the corrosion behavior of aluminum-based materials may vary significantly depending on the concentration, distribution, and specific effects of the alloying additives.…”

Section: Introductionmentioning

confidence: 86%

Silver-Assisted Hydrogen Evolution from Aluminum Oxidation in Saline Media

Buryakovskaya,

Maslakov,

Borshchev

et al. 2024

Molecules

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A swarf of aluminum alloy with high corrosion resistance and ductility was successfully converted into fine hydro reactive powders via ball milling with silver powder and either lithium chloride or gallium. The latter substances significantly intensified particle size reduction, while silver formed ‘cathodic’ sites (Ag, Ag2Al), promoting Al corrosion in aqueous saline solutions with hydrogen generation. The diffraction patterns, microphotographs, and elemental analysis results demonstrated partial aluminum oxidation in the samples and their contamination with tungsten carbide from milling balls. Those factors were responsible for obtaining lower hydrogen yields than expected. For AlCl3 solution at 60 °C, Al–LiCl–Ag, Al–LiCl, Al–Ga–Ag, and Al–Ga composites delivered (84.6 ± 0.2), (86.8 ± 1.4), (80.2 ± 0.5), and (76.7 ± 0.7)% of the expected hydrogen, respectively. Modification with Ag promoted Al oxidation, thus providing higher hydrogen evolution rates. The samples with Ag were tested in a CaCl2 solution as well, for which the reaction proceeded much more slowly. At a higher temperature (80 °C) after 3 h of experiment, the corresponding hydrogen yields for Al–LiCl–Ag and Al–Ga–Ag powders were (46.7 ± 2.1) and (31.8 ± 1.9)%. The tested Ag-modified composite powders were considered promising for hydrogen generation and had the potential for further improvement to deliver higher hydrogen yields.

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Section: Introductionmentioning

confidence: 86%

Silver-Assisted Hydrogen Evolution from Aluminum Oxidation in Saline Media

Buryakovskaya,

Maslakov,

Borshchev

et al. 2024

Molecules

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“…The added Si provides a corrosion inhibition by forming Mg 2 Si intermetallic particles, which eventually transform into MgO and SiO 2 layers, protecting the alloy surface from corrosion. However, eutectic Si at the alloy grain boundaries acts as cathodic clusters for galvanic corrosion [39]. Although MgO and SiO 2 can protect the alloy surface from corrosion in NaCl and HCl environment, they fail to do so in NaOH environment as the aggressive OHthins out the protective oxide layers and attack the grain boundaries.…”

Section: Impedance Measurementmentioning

confidence: 99%

“…The Mg 2 Si precipitations form SiO 2 and MgO [22,43,44]. However, in NaOH there is higher rate of H 2 generation on the exposed surfaces of the alloy with eutectic amount of Si, which may be responsible for the increased corrosion [39].…”

Section: Impedance Measurementmentioning

confidence: 99%

“…However, a different scenario is observed in case of NaOH solution where the surface is more severely deteriorated for 12.7Si added alloy than 0.2Si added alloy as the attack by OHions cannot be defended by the strengthening effect of Mg 2 Si. White spots on the surfaces of the alloys after corrosion correspond to the Al 2 O 3 formed after hydrolysis reaction [39]. A yellow green color tone is observed for the surface of each alloy after corrosion, which may 0.2Si Alloy [49].…”

Section: Optical Micrographic Observationmentioning

confidence: 99%

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Investigation on electrochemical corrosion behavior of eutectic Al-Si automotive alloy in 0.2 M HCl, 0.2 M NaOH, and 0.2 M NaCl environments

Salim Kaiser,

Abdu

2023

JCTM

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This study aimed to evaluate the electrochemical corrosion behavior at the eutectic level of Al-Si automotive alloy in 0.2 M HCl, 0.2M NaCl, and 0.2M NaOH solutions at room temperature. By EIS method in accordance with the specific equivalent circuits of the system, and also by recording Tafel dependences, data were obtained on the kinetic and corrosion parameters in the studied environments for two types of alloys -Al-Si alloy with a eutectic composition of Si (12.7 wt. %) аnd Al-Si alloy containing traces of silicon (0.2 wt. %). Both the EIS data and the Tafel plots disclosed to addition of Si improved the corrosion resistance in the Al-Si alloy in NaCl and HCl environments. In contrast, the opposite phenomenon was observed in the NaOH environment. Added Si improved corrosion resistance by forming MgO and SiO 2 layers; nevertheless, OHmore aggressively attacks the surface than Clions, hindering the corrosion-resisting mechanism by Si. The alloys showed the best corrosion resistance in NaCl solution. In contrast, NaOH was the most destructive, followed by HCl solution, as a more compact and uniform film was formed in NaCl solution. The open circuit potential enthused to the nobler direction in eutectic alloys in NaCl and HCl solution, while NaCl showed comparatively higher open circuit potentials (OCP) than HCl and NaOH. The corrosion current from Tafel analysis and the polarization resistance from EIS analysis showed the maximum values in NaCl solution and the minimum in NaOH solution, as the corrosive attack by OHwas more damaging. The optical and SEM images revealed that scratch marks on polished surfaces were disappeared, and protective layers are formed after corrosion, which are thicker and more compact in the NaCl environment and in higher Si added alloy under NaCl and HCl solution, NaOH being an exception. These images depicted maximum damage in NaOH solution, and then in HCl solution, NaCl showed the minimum damage.

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“…Considering these facts, the permeation data obtained by the given experimental conditions ensuring the volume controlled hydrogen transport through the thin membrane is surely a good indication of HIC resistance of the steel. Since the relationship among hydrogen charging, diffusion kinetics and hydrogen related cracking has been widely discussed in academic circles [32][33][34], the present authors believe that this study will provide valuable insight on the hydrogen permeation and HIC phenomenon.…”

mentioning

confidence: 94%

Validity of the critical thickness of steel for volume controlled diffusion during measurement of electrochemical hydrogen permeation

Kim

Seo

2015

Met. Mater. Int.

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In the electrochemical hydrogen permeation measurement, the rate-determining step can be governed by either bulk diffusion or surface reaction depending primarily on the thickness of steel membrane. In order to validate the critical thickness for the volume-controlled hydrogen atom transport in the permeation test under cathodic polarization condition, the sheet-type thin steel membrane with various thicknesses in the range from 0.5 mm to 2 mm is evaluated. The experimental results demonstrate that the permeation flux evaluated under cathodic polarization is inversely proportional to the steel thickness down to 0.5 mm. Based on the verified membrane thickness for the volume-controlled diffusion, a comparison of hydrogen diffusivity with respect to microstructure of the ferritic steel is discussed. It clearly indicates that the increase in fraction of pearlite and bainite in the microstructure contributes effectively to slower diffusion kinetics due mainly to the hydrogen trapping at various trap sites in the microstructures.

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Hydrogen generation using the corrosion of Al-Sn and Al-Si alloys in an alkaline solution

Cited by 18 publications

References 30 publications

Silver-Assisted Hydrogen Evolution from Aluminum Oxidation in Saline Media

Silver-Assisted Hydrogen Evolution from Aluminum Oxidation in Saline Media

Investigation on electrochemical corrosion behavior of eutectic Al-Si automotive alloy in 0.2 M HCl, 0.2 M NaOH, and 0.2 M NaCl environments

Validity of the critical thickness of steel for volume controlled diffusion during measurement of electrochemical hydrogen permeation

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