Abstract
A layered double hydroxide (LDH) film was formed in situ on aluminum alloy 2024 through a urea hydrolysis method, and a decavanadate-intercalated LDH (LDH-V) film fabricated through the dip coating method. The microstructural and morphological characteristics were investigated by scanning electron microscopy (SEM). The corrosion-resistant performance was analyzed by electrochemical impedance spectroscopy (EIS), scanning electrochemical microscopy (SECM), and a salt-spray test (SST).The SEM results showed that a complete and defect-free surface was formed on the LDH-VS film. The anticorrosion results revealed that the LDH-VS film had better corrosion-resistant properties than the LDH-S film, especially long-term corrosion resistance. The mechanism of corrosion protection was proposed to consist of the self-healing effect of the decavanadate intercalation and the shielding effect of the sol-gel film.
Highlights
The traditional method of protecting aluminum alloy 2024 (AA2024), which has been universally employed in various industries, consisted of chromate conversion coatings due to their excellent performance, ease of application, and low cost [1]
We focused on the combination of layered double hydroxide (LDH) coatings and sol-gel films to fabricate a “smart” hybrid coating that could offer enhanced and active corrosion protection for substrates
The LDH-VS film formed on the substrate was approximately 5.843 μm thick
Summary
The traditional method of protecting aluminum alloy 2024 (AA2024), which has been universally employed in various industries, consisted of chromate conversion coatings due to their excellent performance, ease of application, and low cost [1]. Various environmentally compatible coating systems have been developed to offer more options for the protection of aluminum alloys Among these novel coating systems, layered double hydroxides (LDHs) appear to be a favorable alternative to the traditional chromate conversion coatings due to their characteristic structure and capability of ion exchange intercalation. Chen et al [25] reported a novel in situ hydrothermal method to fabricate an oriented Ni-Al-LDH film on a substrate, which turned out to be an excellent superhydrophobic coating material after simple superhydrophobic treatment This coating is suitable for various applications (including anti-corrosion), combining the inherent features of the LDH films such as ion-exchange abilities. We focused on the combination of LDH coatings and sol-gel films to fabricate a “smart” hybrid coating that could offer enhanced and active corrosion protection for substrates
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