Mechanisms of hydrogen absorption, trapping and release during galvanostatic anodization of high-strength aluminum alloys

Safyari, Mahdieh; Mori, Gregor; Ucsnik, Stephan; Moshtaghi, Masoud

doi:10.1016/j.jmrt.2022.11.111

Cited by 14 publications

(7 citation statements)

References 52 publications

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“…All the molecules were found to desorb at the same temperature, but the desorption temperature was observed to vary with the O content of the layer, which was shown to modify the crystallization process [31]. The surface desorption process is not the mechanism driving the observed desorption temperatures, which is more likely linked to the structural evolution of the GGST layer upon annealing [32]. Indeed, the GGST film undergoes significant composition and structural changes during the annealing, since the as-deposited amorphous layer with a homogenous composition experiences a phase separation process at the amorphous state before the sequential crystallization of Ge and Ge 2 Sb 2 Te 5 [15].…”

Section: Resultsmentioning

confidence: 92%

Thermo-desorption measurements during N-doped Ge-rich Ge₂Sb₂Te₅ crystallization

et al. 2023

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Ge-rich Ge2Sb2Te5 (GGST) is considered as one of the best candidates for industrial phase change memory production. GGST memory cells are generally embedded with Si or Ti nitride layers to prevent oxidation, as it leads to an undesired decrease of the GGST crystallization temperature. Furthermore, GGST films are usually doped with elements such as N, C, O, or Bi, aiming to delay GGST crystallization during the fabrication process as well as during memory cell operation. In this work, ultrahigh vacuum thermal desorption spectroscopy (TDS) was performed during isochronal annealing of a N-doped GGST film covered by a 10 nm-thick TiNx layer. Desorption is observed before GGST crystallization, but the comparison between TDS and in situ X-ray diffraction (XRD) measurements shows that the main desorption peak, observed between 653 K and 703 K, occurs after GGST full crystallization. The most prominent desorbing species are Ar, N2, H2, and H. These results show that the TiNx polycrystalline layer cannot prevent N atoms from leaving the GGST layer during annealing, suggesting a progressive change of the N-doped GGST chemical composition during thermal annealing and crystallization.

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Section: Resultsmentioning

confidence: 92%

Thermo-desorption measurements during N-doped Ge-rich Ge₂Sb₂Te₅ crystallization

et al. 2023

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“…The magnitudes and durations of voltage changes between electrodes and pulses with high and low current densities in the process of PHAL synthesis are shown in Figure 1. To select anodizing modes, the results of other studies were analyzed and taken into account [57,58]. 51] and slow (at the frequency of their change < 0.1 Hz) [38,43,[52][53][54].…”

Section: Technological Features Of Pulsed Hard Anodizing Of 1011 Alum...mentioning

confidence: 99%

“…The magnitudes and durations of voltage changes between electrodes and pulses with high and low current densities in the process of PHAL synthesis are shown in Figure 1. To select anodizing modes, the results of other studies were analyzed and taken into account [57,58]. The electrolyte temperature in the synthesis process of PHAL was maintained with an accuracy of ±1 °С at the levels of −5, 0, +5, and +10 °С.…”

Section: Technological Features Of Pulsed Hard Anodizing Of 1011 Alum...mentioning

confidence: 99%

Abrasive Wear Resistance and Tribological Characteristics of Pulsed Hard Anodized Layers on Aluminum Alloy 1011 in Tribocontact with Steel and Ceramics in Various Lubricants

Student,

Pohrelyuk,

Padgurskas

et al. 2023

Coatings

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Based on the analysis of known methods of surface hardening of aluminum alloys (chromium plating, plasma electrolytic oxidation, hard anodizing), the prospects for pulsed hard anodizing are shown both for improving the functional characteristics of alloys and for large-scale implementation of this method. The purpose of this work is to show the possibility of pulsed hard anodizing to improve the serviceability of low-strength aluminum alloy 1011 under conditions of abrasive and sliding wear. The influence of the pulsed anodizing temperature on the phase-structural state of the synthesized layers, their abrasive wear resistance, and tribological characteristics in various lubricants were established, and the mechanism of wear of these layers was proposed. It is shown that with an increase in the temperature of pulsed anodizing, the wear resistance of the synthesized layers increases, and their abrasive wear resistance decreases. The negative effect of lubricating media on the wear resistance of the synthesized layers compared to tests under dry conditions was shown, and an explanation for this phenomenon is proposed. A significant (up to 40 times) increase in wear resistance in dry friction of anodized low-strength aluminum alloy 1011 compared to high-strength aluminum alloy 1050 was shown.

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“…50-1496), as indicated in Figure 9b. The corrosion product Al2O3 is dense, stable, and an excellent insulator, facilitating superior corrosion protection for the under-layered coating to some extent [39], which resulted in a gradual decrease in the corrosion rate of the ZnAl15 coating after 360 h. In the case of the ZnAl15 coating, as shown in Figure 9b, for the initial 360 h, ZnO was also the dominant corrosion product, as with the Zn coating, indicating that the dissolution of Zn is the primary corrosion mechanism at this stage. As shown in Figure 2, both the Al-rich phase and Zn-rich phase existed in the as-sprayed ZnAl15 coating.…”

Section: Effect Of Al Content On the Corrosion Mechanism Of Arc-spray...mentioning

confidence: 99%

Section: Effect Of Al Content On the Corrosion Mechanism Of Arc-spray...mentioning

confidence: 99%

Effect of Al Content on the Long-Term Corrosion Behavior of Arc-Sprayed ZnAl Alloy Coatings

Ding,

Zhang,

Zhou

et al. 2023

Coatings

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The corrosion of steel structures in aggressive marine environments is a vital issue that induces significant degradation of their performance and lifespan. Herein, three arc-sprayed ZnAl coatings with varied Al contents of 0 wt.%, 15 wt.%, and 50 wt.% were deposited onto a hull steel substrate. The effect of Al content on the long-term corrosion protection performance of ZnAl coatings left in a chloride-containing solution for 840 h was systematically investigated. The evolutions of open-circuit potential, polarization curves, and electrochemical impedance spectroscopy of different ZnAl coatings during the long-term immersion test were examined. The morphologies and phase constitutions of the corrosion products were characterized. The results indicated that the corrosion rate of ZnAl coatings decreased as the Al content increased, and the ZnAl50 coating exhibited the most superior long-term corrosion protection performance. Moreover, for the three ZnAl coatings with an Al contents varying from 0 to 50%, their corrosion rate increased with immersion time in the initial 360 h due to the formation of the unstable and porous corrosion product ZnO; after 360 h immersion, their corrosion rate decreased with the prolonging of immersion time. This was revealed to be related to the formation of different corrosion products. ZnO and stable Al2O3 were the main corrosion products for the pure Zn coating and ZnAl15 coating, respectively. Al2O3 and powerful layered double hydroxide Zn6Al2(OH)16CO3·4H2O were found to be the dominant corrosion products of the ZnAl50 coating, which was responsible for its remarkable long-term corrosion protection performance.

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Mechanisms of hydrogen absorption, trapping and release during galvanostatic anodization of high-strength aluminum alloys

Cited by 14 publications

References 52 publications

Thermo-desorption measurements during N-doped Ge-rich Ge₂Sb₂Te₅ crystallization

Thermo-desorption measurements during N-doped Ge-rich Ge₂Sb₂Te₅ crystallization

Abrasive Wear Resistance and Tribological Characteristics of Pulsed Hard Anodized Layers on Aluminum Alloy 1011 in Tribocontact with Steel and Ceramics in Various Lubricants

Effect of Al Content on the Long-Term Corrosion Behavior of Arc-Sprayed ZnAl Alloy Coatings

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Mechanisms of hydrogen absorption, trapping and release during galvanostatic anodization of high-strength aluminum alloys

Cited by 14 publications

References 52 publications

Thermo-desorption measurements during N-doped Ge-rich Ge2Sb2Te5 crystallization

Thermo-desorption measurements during N-doped Ge-rich Ge2Sb2Te5 crystallization

Abrasive Wear Resistance and Tribological Characteristics of Pulsed Hard Anodized Layers on Aluminum Alloy 1011 in Tribocontact with Steel and Ceramics in Various Lubricants

Effect of Al Content on the Long-Term Corrosion Behavior of Arc-Sprayed ZnAl Alloy Coatings

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Thermo-desorption measurements during N-doped Ge-rich Ge₂Sb₂Te₅ crystallization

Thermo-desorption measurements during N-doped Ge-rich Ge₂Sb₂Te₅ crystallization