Active protective PEO coatings on AA2024: Role of voltage on in-situ LDH growth
authors Mohedano, M; Serdechnova, M; Starykevich, M; Karpushenkov, S; Bouali, AC; Ferreira, MGS; Zheludkevich, ML
nationality International
journal MATERIALS & DESIGN
author keywords PEO; Active protection; LDH; Corrosion
keywords PLASMA ELECTROLYTIC OXIDATION; SELF-HEALING COATINGS; AM50 MAGNESIUM ALLOY; ALUMINUM-ALLOYS; CORROSION PROTECTION; CURRENT-DENSITY; THIN-FILMS; MG ALLOY; INHIBITORS; MICROSTRUCTURE
abstract Four voltage-controlled plasma electrolytic oxidation (PEO) coatings were developed on AA2024 aluminum alloy at 350 V, 400 V, 450 V and 500 V. Zn-Al LDH layer was in situ grown and loaded with corrosion inhibitor (vanadate) on the coatings to provide active protection to the PEO layers. The structure, morphology and composition of PEO coatings without and with LDH-NO3 and LDH-VOx were investigated using SEM, EDS, XRD and GDOES. Coatings formed at higher voltages (thicker and more stable) reveal a decrease of LDH flakes on the surface. The corrosion behavior and the effectiveness of LDH formation and inhibitor intercalation were also studied. Electrochemical impedance spectroscopy and scanning vibrating electrode techniques have shown a remarkable increase in the corrosion resistance of the LDH-inhibitor treated sample in comparison with PEO coated AA2024 specimen. (C) 2017 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0264-1275
isbn 1873-4197
year published 2017
volume 120
beginning page 36
ending page 46
digital object identifier (doi) 10.1016/j.matdes.2017.01.097
web of science category Materials Science, Multidisciplinary
subject category Materials Science
unique article identifier WOS:000397365000004
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journal analysis (jcr 2017):
journal impact factor 4.525
5 year journal impact factor 4.753
category normalized journal impact factor percentile 81.579
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