Zn-Al LDH growth on AA2024 and zinc and their intercalation with chloride: Comparison of crystal structure and kinetics
authors Bouali, AC; Iuzviuk, MH; Serdechnova, M; Yasakau, KA; Wieland, DCF; Dovzhenko, G; Maltanava, H; Zobkalo, IA; Ferreira, MGS; Zheludkevich, ML
nationality International
journal APPLIED SURFACE SCIENCE
author keywords Layered double hydroxide; Anion exchange; Crystal structure
keywords LAYERED DOUBLE HYDROXIDES; CORROSION PROTECTION; CONVERSION COATINGS; MAGNESIUM ALLOY; ALUMINUM-ALLOYS; SMART COATINGS; FILMS; DIFFRACTION; RESISTANCE; PROGRAM
abstract The dissimilarities and features of the crystal structure of ZnAl LDH-NO3 conversion layers grown directly on pure zinc and aluminum alloy 2024 were investigated in the present paper. Although the nature of the cations in the double hydroxides are the same in both cases (Al3+ and Zn2+), their sources differ according to the substrate. This leads to a difference in the cationic layers and interlayer structure, which consequently influences the anionic exchange reaction. In the frame of this work, the kinetics of the anion-exchange of nitrate by chloride was investigated as well as the crystal structure of the resulting ZnAl LDH-Cl on both substrates. Synchrotron high-resolution X-ray diffraction was the main method to obtain structural information and was supported by additional calculations and scanning electron microscopy. The current study revealed noticeable changes on the positioning of the interlayer atoms for the ZnAl-LDH-Cl on zinc in comparison with the ones on AA2024 substrate.
publisher ELSEVIER
issn 0169-4332
year published 2020
volume 501
digital object identifier (doi) 10.1016/j.apsusc.2019.144027
web of science category Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter
subject category Chemistry; Materials Science; Physics
unique article identifier WOS:000504658100075
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journal analysis (jcr 2019):
journal impact factor 6.182
5 year journal impact factor 5.141
category normalized journal impact factor percentile 83.386
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