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A kind of aluminum profile anodic oxidation electrolyte and preparation method thereof, and anodic oxidation process of aluminum profile

An anodizing and electrolyte technology, applied in electrolytic coatings, surface reaction electrolytic coatings, coatings, etc., can solve the problems of poor electrolyte stability, color change of oxide film, uneven thickness, etc., to enhance corrosion resistance. The effect of improving corrosion resistance and film performance

Active Publication Date: 2021-10-19
ANHUI LANT ALUMINUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The anodized film obtained by this process is more uniform, more compact and less porous, but the oxalic acid in the electrolyte not only has certain toxicity, but also is reduced to glycolic acid on the cathode and oxidized to carbon dioxide on the anode, resulting in The stability of the electrolyte becomes poor, which will cause the color of the final oxide film to change with the change of the oxidation process, and the thickness is extremely uneven
In addition, the nickel salt used in the sealing process will also bring some pollution to the environment.

Method used

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  • A kind of aluminum profile anodic oxidation electrolyte and preparation method thereof, and anodic oxidation process of aluminum profile

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Embodiment 1

[0035] In this embodiment, the electrolyte is prepared through the following three steps:

[0036] (1) preparing phytic acid solution: dissolving phytic acid in water to obtain a phytic acid solution with a concentration of 225g / L;

[0037] (2) preparation of fulvic acid solution: fulvic acid is dissolved in water to obtain a concentration of fulvic acid solution of 87.5g / L;

[0038] (3) Preparation of electrolyte: the phytic acid solution prepared in step (1) is mixed with the fulvic acid solution prepared in step (2) in equal volumes, and ultrasonically mixed to obtain a mixed solution, which is added to the mixed solution in stirring Add dropwise a sodium hydroxide solution with a concentration of 0.1mol / L until the pH of the mixed solution is 2.5, then add water to the mixed solution to obtain an electrolyte, the concentration of phytic acid in the electrolyte is 90g / L, fulvic acid The concentration in the electrolyte is 35g / L.

[0039] The anodizing process of aluminum ...

Embodiment 2

[0047] In this embodiment, the electrolyte is prepared through the following three steps:

[0048] (1) preparing phytic acid solution: dissolving phytic acid in water to obtain a phytic acid solution with a concentration of 200g / L;

[0049] (2) preparation of fulvic acid solution: fulvic acid is dissolved in water to make a concentration of 102g / L fulvic acid solution;

[0050] (3) Preparation of electrolyte: the phytic acid solution prepared in step (1) is mixed with the fulvic acid solution prepared in step (2) in equal volumes, and ultrasonically mixed to obtain a mixed solution, which is added to the mixed solution in stirring Add dropwise a sodium hydroxide solution with a concentration of 0.1mol / L until the pH value of the mixed solution is 2.8, then add water to the mixed solution to obtain an electrolyte, the concentration of phytic acid in the electrolyte is 80g / L, fulvic acid The concentration in the electrolyte is 40.8g / L.

[0051] The anodizing process of aluminu...

Embodiment 3

[0059] In this embodiment, the electrolyte is prepared through the following three steps:

[0060] (1) preparing phytic acid solution: dissolving phytic acid in water to obtain a phytic acid solution with a concentration of 175g / L;

[0061] (2) preparation of fulvic acid solution: fulvic acid is dissolved in water to make a concentration of 137.5g / L fulvic acid solution;

[0062] (3) Preparation of electrolyte: the phytic acid solution prepared in step (1) is mixed with the fulvic acid solution prepared in step (2) in equal volumes, and ultrasonic dispersion is used to uniformly obtain a mixed solution, which is added to the mixed solution in stirring Add dropwise a sodium hydroxide solution with a concentration of 0.05mol / L until the pH value of the mixed solution is 2.0, then add water to the mixed solution to obtain an electrolyte, the concentration of phytic acid in the electrolyte is 70g / L, fulvic acid The concentration in the electrolyte is 55g / L.

[0063] The anodizin...

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Abstract

The invention discloses an aluminum profile anodic oxidation electrolyte, a preparation method thereof, and an anodic oxidation process of an aluminum profile, which belong to the technical field of electrolysis or electrophoresis, and consist of phytic acid, fulvic acid, a pH regulator and water. The concentration of acid in the electrolyte is 70-90g / L, the concentration of fulvic acid in the electrolyte is 35-55g / L, and the pH value of the electrolyte is 2.0-2.8. On the one hand, phytic acid mainly comes from the roots, stems and seeds of plants, while fulvic acid can be used for medical treatment, so the electrolyte composed of the two as the main components is completely non-toxic and harmless, and is green. Environmentally friendly; on the other hand, it can adsorb aluminum ions dispersed in the solution, and the complex formed by phytic acid and aluminum ions to the vicinity of the aluminum profile, assisting in sealing pores, and also forming phytic acid and Al on the surface of alumina 3+ The complex compound produces a dense hydrophobic protective film, which slows down the chemical dissolution of the oxide film by the electrolyte, improves the performance of the film layer, and enhances the corrosion resistance of the oxide film.

Description

technical field [0001] The invention belongs to the technical field of electrolysis or electrophoresis technology, and in particular relates to an anodic oxidation electrolyte for aluminum profiles, a preparation method thereof, and an anodic oxidation process for aluminum profiles. Background technique [0002] Due to the advantages of low density, high specific strength, good formability, good thermal and electrical conductivity, and low price, aluminum alloys are widely used in the fields of construction and decoration, transportation, aerospace, and weapon manufacturing. In order to improve the anti-corrosion performance of aluminum alloy, the surface treatment method of one-time anodic oxidation is usually used to form an oxide film with corrosion resistance. However, because the oxide film has a disordered porous structure, its corrosion resistance is still poor and cannot meet some requirements. Fields with high requirements for anti-corrosion. [0003] Therefore, on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/10C25D11/12C25D11/16
CPCC25D11/10C25D11/12C25D11/16
Inventor 潘祖堂熊茂清袁学兵
Owner ANHUI LANT ALUMINUM
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