Hydroxyapatite Microparticles as Feedback-Active Reservoirs of Corrosion Inhibitors
authors Snihirova, D; Lamaka, SV; Taryba, M; Salak, AN; Kallip, S; Zheludkevich, ML; Ferreira, MGS; Motemor, MF
nationality International
journal ACS APPLIED MATERIALS & INTERFACES
author keywords hydroxyapatite; corrosion inhibitor; sol-gel coating; AA2024; pH microscopy
keywords SOL-GEL COATINGS; PROTECTION PERFORMANCE; ALUMINUM-ALLOY; NANOCONTAINERS; METALS; PRETREATMENTS; ENTRAPMENT; MECHANISM; ABILITY; AA2024
abstract This work contributes to the development of new feedback-active anticorrosion systems. Inhibitor-doped hydroxyapatite microparticles (HAP) are used as reservoirs, storing corrosion inhibitor to be released on demand. Release of the entrapped inhibitor is triggered by redox reactions associated with the corrosion process. HAP were used as reservoirs for several inhibiting species: cerium(III), anthanum(III), salicylaldoxime and 8-hydroxyquinoline. These species are effective corrosion inhibitors for a 2024 aluminum alloy (AA2024) used here as a model metallic substrate. Dissolution of the microparticles and release of the inhibitor are triggered by local acidification resulting from the anodic half-reaction during corrosion of AA2024. Calculated values and experimentally measured local acidification over the aluminum anode (down to pH = 3.65) are presented. The anticorrosion properties of inhibitor-doped HAP were assessed using electrochemical impedance spectroscopy. The microparticles impregnated with the corrosion inhibitors were introduced into a hybrid silica-zirconia sol-gel film, acting as a thin protective coating for AA2024, an alloy used for aeronautical applications. The protective properties of the sol-gel films were improved by the addition of HAP, proving their applicability as submicrometer-sized reservoirs of corrosion inhibitors for active anticorrosion coatings.
publisher AMER CHEMICAL SOC
issn 1944-8244
year published 2010
volume 2
issue 11
beginning page 3011
ending page 3022
digital object identifier (doi) 10.1021/am1005942
web of science category Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
subject category Science & Technology - Other Topics; Materials Science
unique article identifier WOS:000284454400011
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  impact metrics
journal impact factor (jcr 2016): 7.504
5 year journal impact factor (jcr 2016): 7.823
category normalized journal impact factor percentile (jcr 2016): 89.482
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