Influence of Zn as minority alloying element on the uniform and local corrosion of amorphous rapidly solidified AlCuMg(Zn) ribbons

Dyakova, Vanya; Tzaneva, B. R.; Kostova, Yoanna

doi:10.1063/5.0090752

Cited by 3 publications

(7 citation statements)

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“…On the XRD patterns of the corrosion products, released at 25 °C from the nanocrystalline Al74Ni16Si10-ncr and the ultra-fine crystalline Al74Ni15Si9Cu2-ufcr alloys, only great intensity NaCl peaks (residues from the 3.5% NaCl solution) are identified. On the XRD patterns at 50 °C of both alloys, amorphous humps of AlO(OH) are visible around 2Ɵ (10-25), (25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35), and (35-48), (Figure 3b,d), and the humps in the copper-containing alloy Al74Ni15Si9Cu2-ufcr again are more intense. Based on the form of the XRD patterns, we conclude that the microstructure of the released corrosion products from the both the Al74Ni16Si10-ncr and Al74Ni15Si9Cu2-ufcr alloys is a mixture of an X-ray amorphous matrix with singe crystalline phases.…”

Section: Electrochemical Corrosion Testsmentioning

confidence: 99%

“…In our previous research, we investigated the influence of Ni on the corrosion behaviour of amorphous alloys (Al 74 Cu 16 Mg 10 ) 100−x Ni x (x = 1, 2, 3 at.%) [29]. The results showed a significant improvement in the pitting corrosion resistance of all amorphous alloys compared to their crystalline analogues, which was explained by the absence of secondary phases Al 2 Cu and Al 2 CuMg in the chemically homogenous amorphous structure.…”

Section: Introductionmentioning

confidence: 98%

“…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].…”

Section: Introductionmentioning

confidence: 99%

“…The Influence of minority alloying elements, Zn and Zr, on the corrosion behaviour of rapidly solidified and annealed nanocrysalline Al 74 Cu 16 Mg 10 alloys was studied in [30]. The effect of the amorphous-crystalline structure transformation on the corrosion rate was negative, and the effect was most significant in the Zn-containing alloy.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Electrochemical Corrosion Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…For each ribbon, at least 5 tests were performed to verify the reproducibility of the results. The results of the polarization tests of AlCuMg(Zn) and AlCuMg(Zr) ribbons were compared with those obtained for pure Al (99.999%) [21].…”

Section: Electrochemical Corrosion Testsmentioning

confidence: 99%

EFFECT OF MINORITY ALLOYING ELEMENTS Zn AND Zr ON THE CORROSION BEHAVIOR OF AMORPHOUS ALLOYS АLCUMG(Zn) AND ALCUMG(Zr) AND THEIR NANOCRYSTALLINE ANALOGUES

2022

IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TE

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Быстро затвердевшие ленты на основе сплава Al74Cu16Mg10 были получены методом спиннингования. Для получения кристаллической структуры быстрозатвердевшие ленты отжигали в атмосфере аргона. Аморфная и нанокристаллическая структура подтверждена анализами XRD и TЕM. Исследовано влияние легирующих элементов Zn и Zr на коррозионное поведение быстрозатвердевшего сплава Al74Cu16Mg10 в аморфных и нанокристаллических аналогах. Проведены гравиметрические испытания на общую коррозию при 25 °С и 50 °С в среде 3,5% NaCl. При 25 °С скорость коррозии аморфных сплавов оказалась в 1,5-4 раза ниже скорости коррозии их кристаллических аналогов. Влияние трансформации аморфной структуры в нанокристаллическую на скорость коррозии при 50 °С отрицательно и наиболее существенно в Zn-содержащем сплаве. Проведены электрохимические испытания на общую и локальную коррозию в среде 3,5% NaCl и объяснен гальванический механизм локальной коррозии в сплавах. Основной причиной регистрируемой повышенной локальной коррозии кристаллических сплавов является химическая и структурная неоднородность, связанная с наличием в алюминиевой матрице активных интерметаллических фаз Al2CuMg, Al2 (Cu, Zn), Al3Zr4. Обсуждается влияние неровности поверхности, структуры слоя продуктов коррозии, отложенного на поверхность металла, и отжига для трансформации аморфной структуры на коррозионное поведение сплавов.

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Effect of Cu as Мinority Аlloying Еlement on Glass Forming Ability and Crystallization Behavior of Rapidly Solidified Al-Si-Ni Ribbons

Dyakova,

Spasova,

Kostova

et al. 2023

ETR

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The influence of copper as a minority alloying element in the process of rapid solidification of Al-Si-Ni ribbons produced by Chill Block Melt Spinning (CBMS) was investigated. XRD and TEM analyses proved a completely amorphous structure of the alloys Al74Ni16Si10 and (Al74Ni16Si10)98Cu2. The crystallization behaviour of these alloys was studied by DSC analysis. It was found that the crystallization of the amorphous alloys (Al74Ni16Si10)100-xCux, x=0, 2 runs in two steps. The temperatures Tx1 and Tx2 of each of the crystallization steps were determined. It was proven that the addition of 2 at. % copper does not significantly change Tx temperatures. The temperature difference ΔTx was calculated and it showed that more thermally stable is the copper containing alloy. Crystalline analogues of the amorphous alloys were obtained by annealing of the melt-spun amorphous ribbons at a temperature which exceeded by 170°C the onset crystallization temperature. The type and size of separated crystalline phases were determined by XRD. It was found that the addition of 2 at. % Cu to Al74Ni16Si10 alloy causes a separation of new phases - Cu3.8Ni and (Al, Cu)Ni3 and 54%, 24% and 7% size increase of the phases Al, Al3Ni, NiSi2 respectively.

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Influence of Zn as minority alloying element on the uniform and local corrosion of amorphous rapidly solidified AlCuMg(Zn) ribbons

Cited by 3 publications

References 6 publications

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

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

EFFECT OF MINORITY ALLOYING ELEMENTS Zn AND Zr ON THE CORROSION BEHAVIOR OF AMORPHOUS ALLOYS АLCUMG(Zn) AND ALCUMG(Zr) AND THEIR NANOCRYSTALLINE ANALOGUES

Effect of Cu as Мinority Аlloying Еlement on Glass Forming Ability and Crystallization Behavior of Rapidly Solidified Al-Si-Ni Ribbons

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