Issue 13, 2020

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

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

Article information

Article type
Paper
Submitted
28 апр 2019
Accepted
25 май 2019
First published
27 май 2019

Dalton Trans., 2020,49, 3956-3964

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, 49, 3956 DOI: 10.1039/C9DT01773A

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