Large-hole-pitch anodized aluminum oxide film based on parabolic equation boosting and preparation method and application of large-hole-pitch anodized aluminum oxide film

Abstract

The invention belongs to the technical field of material surface preparation, and discloses a large-hole-pitch anodized aluminum oxide film based on parabolic equation boosting and a preparation method and application of the large-hole-pitch anodized aluminum oxide film. The preparation method comprises the following steps: ultrasonically cleaning the surface of a high-purity aluminum foil, and chemically etching to remove a compact oxide layer on the aluminum surface; performing electrochemical polishing treatment on the clean aluminum foil to enable the surface to be smooth and flat; carrying out anodic oxidation in electrolyte by taking the obtained polished aluminum foil as an anode and a graphite flake as a cathode, and boosting based on a parabolic equation in the process, so as to obtain a large-hole-pitch anodic aluminum oxide film with an aluminum substrate; the obtained large-hole-pitch anodic aluminum oxide film with the aluminum substrate is placed in a supersaturated copper chloride solution to be etched, the aluminum substrate is removed, and the large-hole-pitch anodic aluminum oxide film is obtained; or etching in a chromic acid and phosphoric acid mixed solution, removing the anodic aluminum oxide film to obtain an aluminum substrate with large-hole-pitch pits, and then performing secondary anodic oxidation to obtain the regular and ordered large-hole-pitch anodic aluminum oxide film.

Description

technical field [0001] The invention belongs to the technical field of material surface preparation, and in particular relates to a large-pore spacing anodic aluminum oxide film based on a parabolic equation boosting pressure and a preparation method and application thereof. Background technique [0002] With the rapid development of industry and technology in recent years, the demand for functional materials in various industries has greatly increased. In particular, nanomaterials play a decisive role in the fields of micro sensors, energy storage, environmental protection and energy saving, and biomedicine. Porous anodic aluminum oxide film has a highly ordered hexagonal nanopore structure with periodic arrangement, and has the characteristics of high temperature resistance and good insulation. It is often used as an ideal nano-template material and is widely used to prepare large-area highly effective Ordered quasi-zero-dimensional nano-array materials (such as nano-dots...

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Problems solved by technology

But using the constant current method to boost the voltage, the law of the voltage rise is not obvious, so the specific boosting time cannot be determined. In order to avoid too strong reaction, a smaller current density is often used, which makes the boosting time too long, and in In the later stage of boosting, due to the uneven reaction rate on the surface of the aluminum sheet, the voltage fluctuation range is large, which makes it difficult to determine whether the target voltage is reached and when to switch to the constant voltage method, and the voltage is unstable. It is also not conducive to the formation of regular anodized aluminum oxide film

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