Zn-Al LDH growth on AA2024 and zinc and their intercalation with chloride: Comparison of crystal structure and kinetics

Bouali, Anissa C.; Iuzviuk, Mariia H.; Serdechnova, Maria; Yasakau, K.A.; Wieland, D. C. Florian; Dovzhenko, Gleb; Maltanava, Hanna; Zobkalo, I.A.; Ferreira, M.G.S.; Zheludkevich, Mikhail L.

doi:10.1016/j.apsusc.2019.144027

Cited by 48 publications

(25 citation statements)

References 37 publications

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“…48 A two-dimensional PerkinElmer detector with a pixel size of 200 μm 2 was used. An X-ray energy of 25 KeV 48,49 and a wavelength of λ = 0.04952 nm were used in this study. The incident angle was Θ = 0.12°.…”

Section: ■ Introductionmentioning

confidence: 99%

Mechanism of LDH Direct Growth on Aluminum Alloy Surface: A Kinetic and Morphological Approach

et al. 2021

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The growth of ZnAl layered double hydroxide (LDH) on the AA2024 surface was monitored using synchrotron high-resolution X-ray diffraction. Data were analyzed using the Avrami–Erofe’ev kinetic model. Accordingly, the LDH film growth is governed by a two-dimensional (2D) diffusion-controlled reaction with a zero nucleation rate. Additional methods, including ex situ atomic force microscopy/scanning Kelvin probe force microscopy (AFM/SKPFM) supported by in situ open-circuit potential (OCP) measurements together with scanning electron microscopy (SEM) and transmission electron microscopy with energy-dispersive X-ray spectroscopy (TEM/EDX) analysis, provided further insight into the different stages of the mechanism of LDH growth. Prior to the conversion coating formation, an intermediate layer is formed as a basis for the establishment of the LDH flakes. Moreover, a Cu-rich layer was revealed, which could contribute to the acceleration of LDH growth. The formed LDH layer does not show any cracks at the interface but presents minor irregularities in the structure, which could favor adhesion to subsequent organic coatings. The findings presented in this work provide an important insight to the corrosion performance of the LDH conversion coatings and the pathway to adopt for further optimization.

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Section: ■ Introductionmentioning

confidence: 99%

Mechanism of LDH Direct Growth on Aluminum Alloy Surface: A Kinetic and Morphological Approach

et al. 2021

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“…The chemical composition of LDH can be expressed as [M 2+ 1− x M 3+ x (OH) 2 ] x + A n − x / n ·mH 2 O, where M 2+ is divalent metal cation, M 3+ is trivalent metal cation, and A n − is interlayer anion. [ 15 ] The interlayer space of LDH is different due to different interlayer anions. LDH has many advantages, such as environmental friendliness, simple synthesis, strong ion exchange capacity, many active sites, anions between layers, and cations adsorbed by laminar plates.…”

Section: Introductionmentioning

confidence: 99%

A new type of multistage structure hydrotalcite material: To promote the absorption of chemicals in wet leather processing

Zhao

Gao

Lyu

et al. 2022

Applied Organom Chemis

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A novel ZnZr‐MOF‐LDH was designed and synthesized with Zr‐MOF as template, and subsequently, it was applied to leather tanning. Zr‐MOF and ZnZr‐MOF‐LDH were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT‐IR), X‐ray photoelectron spectroscopy (XPS), and nitrogen adsorption instrument. The results of SEM and TEM shown that when the mass ratio of Zr‐MOF to zinc nitrate was 1:2, the size of ZnZr‐MOF‐LDH was about 100 nm with surface has obvious convex polyhedral multilevel structure. The FT‐IR and XPS results showed that the ZnZr‐MOF‐LDH with good crystal structure was prepared. The Brunauer–Emmett–Teller (BET) results showed that the specific surface area and pore volume of ZnZr‐MOF‐LDH were higher than those of ZnZr‐LDH. The application results shown that compared with 2% chrome tanning agent tanning, the shrinkage temperature of leather treated by ZnZr‐MOF‐LDH combined with 2% chrome tanning agent tanning was increased from 73.1°C to 92.1°C and the thickening rate was increased from 38.71% to 56.98%. The subsequent wet processing was carried out which showed that adding ZnZr‐MOF‐LDH considered to be a good way to enhance the absorption rate of dyestuff and fatliquor, resulting in an ecological process and more economical. The absorption of chemicals during wet processing of leather improves the properties of green leather and reduces environmental pollution.

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“…In the past 5 years, new strategy was proposed to protect corrosive metals, that is preparing non-metallic protective layer on the surface of metal substrates [5][6][7][8][9][10]. So far, hydroxides, graphene, and organic materials on metal substrates have been fabricated and investigated for coating materials [5,6,[11][12][13][14]. Bouali et al [6] prepared Zn-Al LDH (layered double hydroxide) on zinc and discussed the anion exchange reaction with NaCl.…”

Section: Introductionmentioning

confidence: 99%

“…So far, hydroxides, graphene, and organic materials on metal substrates have been fabricated and investigated for coating materials [5,6,[11][12][13][14]. Bouali et al [6] prepared Zn-Al LDH (layered double hydroxide) on zinc and discussed the anion exchange reaction with NaCl. Yao et al [7] prepared Mg(OH)2/Mg-Al-LDH coatings on magnesium alloy AZ31, and discussed mechanism for coating formation and corrosion process.…”

Section: Introductionmentioning

confidence: 99%

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Facile synthesis of ZnOHF/ZIF‐8 composite coating for corrosion protection of Zn–Cu–Ti alloy

Ni¹,

Zhu

et al. 2022

Micro & Nano Letters

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ZnOHF/ZIF‐8 (Zeolitic Imidazolate Frameworks‐8) composite with a thickness of about 13.4 μm was coated on Zn–Cu–Ti alloy via hydrothermal route for the first time and its corrosion resistance performance was investigated in 3.5% NaCl solution. It is found that the Icorr of the composite‐coated alloy (7.03 × 10–4 A/cm2) is lower than that of alloy substrate (12.47 × 10–4 A/cm2). Meanwhile, the composite‐coated alloy shows a higher corrosion product resistance of 121.2 Ω cm2 in comparison with that of the alloy substrate (102.2 Ω cm2). Moreover, after 6 days of immersion, the composite‐coated alloy exhibits a lower corrosion layer thickness. Its coating and corrosion layer is only about 42.5 μm, but for the alloy substrate this value is 67 μm. This work confirms the ZnOHF/ZIF‐8 composite can be used as an effective anti‐corrosion coating for Zn alloy.

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Zn-Al LDH growth on AA2024 and zinc and their intercalation with chloride: Comparison of crystal structure and kinetics

Cited by 48 publications

References 37 publications

Mechanism of LDH Direct Growth on Aluminum Alloy Surface: A Kinetic and Morphological Approach

Mechanism of LDH Direct Growth on Aluminum Alloy Surface: A Kinetic and Morphological Approach

A new type of multistage structure hydrotalcite material: To promote the absorption of chemicals in wet leather processing

Facile synthesis of ZnOHF/ZIF‐8 composite coating for corrosion protection of Zn–Cu–Ti alloy

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