Properties of amorphous alloys of Al–REM–Ni and Al–REM–Ni–Fe systems with nanocrystalline structure

Boichyshyn, L. M.; Hertsyk, О. М.; Kovbuz, М. О.; Pereverzeva, T. H.; Kotur, B.

doi:10.1007/s11003-013-9537-y

Cited by 8 publications

(6 citation statements)

References 5 publications

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“…The corrosion resistance of crystalline aluminum in a 4 М aqueous KОН solution was investigated in [7,10]. It was shown that the corrosion current density is equal to 15.7 mA/cm 2 and that the corrosion potential is equal to -1.5 V. It is easy to see (Table 1) that the investigated AMA electrodes are much more stable in KОН solutions than crystalline aluminum.…”

Section: Resultsmentioning

confidence: 98%

“…For all (Table 1), the overvoltage of the reaction of hydrogen release approaches 0 V. The current density of hydrogen release on all three electrodes varies from 5.88 to 6.02 mA/cm 2 and the rate of hydrogen release is 0.55 V for the Al 87 Ni 8 y 5 AMA, 0.17 V for Al 87 Ni 8 Y 4 Dy 1 , and 0.19 V for Al 87 Ni 8 Y 4 Gd 1 . The partial substitution of gadolinium or dysprosium for yttrium in the Al 87 Ni 8 y 5 AMA leads to replacement of the limiting stage of hydrogen release from the stage of discharge to the stage of recombination [10]. The subsurface layers with a depth of about 100 Å and the elemental composition of the AMA electrodes after electrochemical hydrogen release were studied by the scanning electron microscopy (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The amorphous alloys formed by aluminum, transition metals (TM), and REM are characterized by high corrosion resistance. Alloying admixtures enhance the localized corrosion resistance due to the formation of passive films with better protective characteristics, which affect the kinetics of dissolution of the surface and reduce the ability of pits to rapidly dissolve [10]. The cases of low corrosion resistance are often connected with the charge accumulated in the oxide film and, especially, with the degree of its hydration and porosity.…”

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Electrodes Based on Amorphous Metallic Aluminum Alloys in the Reactions of Hydrogen Release

et al. 2016

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in alkaline solutions of potassium hydroxide of different concentrations and the influence of partial substitution of 1 at. % Gd or Dy for Y. It is shown that all investigated specimens are corrosion-resistant in the course of cyclic polarization within the potential range from -1.2 to + 1.0 V in aqueous KОН solutions of various concentrations (0.5-5.0) М. It is shown that AMA electrodes alloyed with 1 at.% Dy exhibit the highest catalytic activity in a 4 М KОН solution.The synthesis and accumulation of hydrogen by metallic alloys and carbon-containing materials is a promising and extensively investigated scientific problem. The electrochemical synthesis of hydrogen can be controlled by changing the elemental composition of the electrodes, concentration of electrolytes, and the temperature of the electrochemical system [1-7]. The amorphous metallic alloys (AMA) exhibiting high corrosion resistance within a broad range of рН values are of especial interest as catalysts of hydrogen release. It is also important to study the accumulation of hydrogen on the cathode accompanied by the formation of metal hydrides.The properties of the AMA are determined by the nature of the base metal and by the composition of alloying admixtures [7][8][9]. Thus, changing the elemental composition of AMA, one can extend the field of their applicability. Amorphous alloys based on aluminum are used as corrosion-resistant coatings and structural materials. The AMA are corrosion-resistant in media whose рН value is close to neutral but electrodes based on Аl dissolve in strong alkaline and acidic aqueous solutions as a result of which hydrogen is released [9]:The amorphous metallic alloys based on aluminum and alloyed with transition and rare-earth metals (REM) exhibit their catalytic action in various redox processes, preserving at the same time their high corrosion resistance [8,9]. It is known that the high corrosion resistance in various media is guaranteed by the transition of

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

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confidence: 99%

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Electrodes Based on Amorphous Metallic Aluminum Alloys in the Reactions of Hydrogen Release

et al. 2016

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“…Сучасний стан розвитку мікро-та макротехніки стимулює пошук можливості використання нових високоефективних матеріалів [7,8], у тім числі аморфних металевих сплавів, які, наприклад, за рівнем магнітних властивостей перевищують у кілька разів кристалічні аналоги. Використання наноматеріалів [9][10][11][12][13] у складі композитів для підвищення ефективності захисного покриття від впливу електромагнітного випромінювання (ЕМВ), або з підвищеною каталітичною здатністю термостабільністю перевершують властивості кристалічних прецизійних сплавів. Наприклад, магнітопроводи з нанокристалічного сплаву Fe73,6Cu1,0Nb2,4Si15,8B1,2 використовують для виготовлення електролічильників, індукційних магнітометрів у геології та для досліджень космічного простору.…”

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Features of the Formation of Surface Layers on Metals

Hertsyk¹,

Kovbuz²,

Pandiak³

et al. 2022

Proc. Shevchenko Sci. Soc. Chem. Sci.

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The practical application of metal alloys, in particular amorphous ones, often necessitates the creation of multifunctional coatings of various nature and purpose on their surfaces. The main requirements for obtaining optimal results of applying such coatings are as follows: 1. Understanding of the morphology of the surface before coating. 2. Information on the physical and mechanical properties of the metal-coating composition. 3. Testing of the adhesion strength immediately after coating. 4. The use of different methods of control of the application and functionality of the coating, depending on the operating conditions of the product. The reliability of functional coatings also depends on the preparation of the surface of the material, as well as the choice of appropriate conditions for its formation. However, regardless of the purpose, a general requirement that all coatings must meet is a good adhesion to the surface of the substrate material. It is also important to ensure the uniform thickness in different areas (protrusions and depressions), because the thickness of the coating determines the longevity of its protective effect. Also, the coatings should have very low rate of dissolution even in the most aggressive environments in which they work. Therefore, the problem of creating optimal coatings is complex and requires a comprehensive study in each specific case. In the case of industrial use of amorphous metal alloys (AMA) based on transition metals with different alloying elements, special attention must be paid to the elemental composition of the surface of the finished products, which can differ significantly from the quantitative composition of the initial charge, which depends on the nature of the components and the applied protocol of ultra-fast cooling of the melt. The difference in the elemental composition on the surface and in the volume of the amorphous alloy is also due to the possible formation of surface chemical compound i.e. metal oxides. The protective properties are evaluated by the speed of metal oxidation, the formation of a layer and the duration of its action. Comparative assessment of the reactivity of amorphous alloys Al87.0Y5.0Ni8.0, Fe73.6Cu1.0Nb2.4Si15.8B1.2, Fe78.5Ni1.0Mo0.5Si6.0B14.0, Co75.5Fe4.6Si6,B16.7 in an aqueous solution of sodium chloride was carried out using electrochemical studies. The main requirements for obtaining optimal results of applying protective coatings on crystalline and amorphous surfaces have been analyzed.

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“…Сталі значення Δі = 0,016 мкА/см 2 свідчать про гальмування виходу йонів за межі подвійного електричного шару, що підтверджує утворення нових захисних поверхневих шарів, які, однак, у цьому агресивному середовищі можуть частково руйнуватись [8,9]. Про це свідчить зсув потенціалу електроду АМС Al87Ni8Y5 в катодний бік після 100 с контакту (рис.…”

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Autocatality effect of AlCl3 applications on the oxidation process of amorphous Al87Ni8Y5 alloy in 0.5 M aqueous NaCl solution

Khrushchyk¹,

Hertsyk²,

Boichyshyn³

et al. 2021

Visnyk Lviv Univ. Ser. Chem.

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Properties of amorphous alloys of Al–REM–Ni and Al–REM–Ni–Fe systems with nanocrystalline structure

Cited by 8 publications

References 5 publications

Electrodes Based on Amorphous Metallic Aluminum Alloys in the Reactions of Hydrogen Release

Electrodes Based on Amorphous Metallic Aluminum Alloys in the Reactions of Hydrogen Release

Features of the Formation of Surface Layers on Metals

Autocatality effect of AlCl3 applications on the oxidation process of amorphous Al87Ni8Y5 alloy in 0.5 M aqueous NaCl solution

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