Corrosion Resistance of Modified Amorphous Alloys Based on Iron in Sulfuric Acid

Hertsyk, О. М.; Kovbuz, М. О.; Hula, T. H.; Korniy, S. А.; Yezerska, Olga; Pandiak, N. L.

doi:10.1007/s11003-021-00492-8

Cited by 8 publications

(2 citation statements)

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“…Особливості (швидкість охолодження і контакт розплаву з атмосферою) під час технологічного процесу виробництва аморфних стрічок на основі Fe зумовлюють різницю між їх контактною та зовнішньою поверхнями, які формуються безпосередньо у миттєвому контакті з поверхнею охолоджуючого елемента і повітрям чи інертним газом [21][22][23].…”

Section: а бunclassified

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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Section: а бunclassified

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 first evidence of high corrosion resistance of metallic glasses was reported by Naka, Hashimoto and Masumoto in 1974 [3]. Since then, numerous studies have been published on the corrosion behaviour of amorphous alloys based on iron [4][5][6][7][8][9], zirconium [10][11][12][13], magnesium [14][15][16], copper [17][18][19], aluminium [20][21][22][23][24][25][26][27][28][29][30] and others [31][32][33].…”

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confidence: 99%

Effect of Cu as a Minority Alloying Element on the Corrosion Behaviour of Amorphous and Crystalline Al-Ni-Si Alloy

Dyakova,

Kostova,

Tzaneva

et al. 2023

Materials

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The effect of copper as a minority alloying element on the corrosion behaviour of amorphous and crystalline Al74Ni16Si10 and Al74Ni15Si9Cu2 alloys was investigated in this study. Amorphous alloys were produced as rapidly solidified ribbons using the Chill Block Melt Spinning (CBMS) method and subsequently annealed to complete crystallisation. The corrosion rate of alloys was obtained through continuous immersion tests in 3.5% NaCl at 25 °C and 50 °C for 360 h. The electrochemical parameters corrosion current density (Jcorr) and corrosion potential (Ecorr) were determined via the potentiodynamic polarisation test. The results showed better corrosion characteristics of amorphous alloys. The addition of 2 at.% copper to the Al74Ni16Si10 alloy improved pitting corrosion resistance without significant effect on the corrosion current and potential. In immersion tests at 25 °C, the presence of copper resulted in an increase in the corrosion rate of about 300% for both amorphous and crystalline alloys. At a temperature of 50 °C, this increase is on average 130%. The apparent difference between the results of the two test methods is discussed in terms of the imperfections on the surface of rapidly solidified ribbons. The results of this study will contribute to a more complex understanding of the nature of amorphous alloys and their application.

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