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In situ growth of a CaAl-NO3-layered double hydroxide film directly on an aluminum alloy for corrosion resistance

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Abstract

In this study, a calcium–aluminum-layered double hydroxide (CaAl-LDH) thin film was grown on an AA6082 aluminum alloy, for the very first time, by using a facile in situ growth method in an effort to investigate the CaAl-LDH structural geometry and corresponding corrosion resistance properties. The structure and surface morphologies of the CaAl-LDH thin film were studied using a scanning electron microscope (SEM) equipped with an EDS detector, a transmission electron microscope (TEM), an X-ray diffractometer (XRD), and a Fourier transform infrared spectrometer (FT-IR), while the electron impendence spectra (EIS) and potentiodynamic curves were recorded to understand the LDH anticorrosion behavior. The findings demonstrated that thin, well-developed CaAl-LDH coatings with different surface morphologies can be prepared with eminent corrosion resistance properties. Specifically, the CaAl-LDH thin film synthesized at 140 °C–24 h synthetic conditions showed a large impedance modulus of 7.3 Ω cm2 at 0.01 Hz (|Z|f = 0.01 Hz), along with a low corrosion current density (Icorr) of 0.0007 μA cm−2, while a vertically orientated rod like structure with a uniform surface morphology was observed.

Graphical abstract: In situ growth of a CaAl-NO3−-layered double hydroxide film directly on an aluminum alloy for corrosion resistance

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Publication details

The article was received on 28 Apr 2019, accepted on 25 May 2019 and first published on 27 May 2019


Article type: Paper
DOI: 10.1039/C9DT01773A
Dalton Trans., 2020, Advance Article

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    In situ growth of a CaAl-NO3-layered double hydroxide film directly on an aluminum alloy for corrosion resistance

    M. A. Iqbal, L. Sun, A. M. LaChance, H. Ding and M. Fedel, Dalton Trans., 2020, Advance Article , DOI: 10.1039/C9DT01773A

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