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Anodizing method of aluminum or its alloy products

A technology of anodizing, aluminum alloy, applied in the direction of anodizing, coating, surface reaction electrolytic coating, etc., can solve the trend of reducing the application of Cr(VI) compounds, has not yet obtained chromate BR127-based bonding system bonding performance issues

Active Publication Date: 2021-05-07
FOKKER AEROSTRUCTURES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, to date, worldwide efforts have not achieved adhesive performance comparable to chromate BR127 based adhesive systems
[0006] Therefore, there is a constant need to eliminate Cr(VI) compounds from metal bonded products, and it is becoming more and more urgent, because there is a trend to reduce the application of Cr(VI) compounds allowed by law, and it is expected that this application will be eliminated. completely prohibited

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  • Anodizing method of aluminum or its alloy products
  • Anodizing method of aluminum or its alloy products
  • Anodizing method of aluminum or its alloy products

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Embodiment Construction

[0047]experiment

[0048]A widely careful study of the standard PSA process has shown that the narrow temperature tolerance associated with the standard PSA process is defined and imposed by the porous oxide structure to be used for bonding. As temperature increases, for example, at 29 ± 2 ° C (TmAx 29.5 ° C) and 30 ± 1 ° C (Tmax 31.7 ° C) (120 g / L phosphoric acid + 80 g / L sulfuric acid; VA = 18V), a significant oxide dissolved, Affect the porous oxide structure, such as the SEM photo proven.

[0049]Further, after anodizing, it is necessary to remove the electrolyte, for example by spraying or soaking rinsing. In the laboratory scale, the sample can be rinsed within a few seconds, such as 5 seconds. Among the commercial facilities of the treatment, for example, a sheet of 1 m × 10 m, the time between the anodized and rinsions is about a few minutes, usually 2 ± 1 minute. It seems that additional dissolution occurs during an anode oxidation and a delay between the de-removal of the el...

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Abstract

The present invention relates in a first aspect to a method for the anodization of an aluminum or aluminum alloy article to form a porous anodic oxide coating, the method comprising the following steps: - an immersion step of immersing the article to be anodized in an electrolyte in a bath, wherein The electrolyte comprises an aqueous solution of 5‑50 g / l sulfuric acid and 2‑50 g / l phosphoric acid, and the article is arranged as an anode with respect to one or more counter electrodes in the electrolyte arranged as cathodes, and a positive anode voltage Va is applied to the article anodizing step, while the temperature of the electrolyte is in the range of 33‑60°C.

Description

Technical field[0001]The present invention relates to an anode oxidation method of aluminum or aluminum alloy article, which is applied, and a method of manufacturing an anodized method using such an anode oxidation, an anodized article, in particular an aviation structure assembly.Background technique[0002]Anodizing is an electrolytic passivation process for increasing the thickness of the surface (native) oxide layer on the surface of the metal component. In an anode oxidation, the DC current is passed through the electrolyte. The components to be treated form the anode (positive electrode) of the circuit. The anode oxidation increases corrosion resistance and wear resistance, and provides better adhesion to the paint bottom and adhesive compared to bare metals. The anodized process known in the art includes an anode oxidation (also known as "CAA") (also known as "CAA") containing chromic acid, and is similar to anodized ("PAA") containing phosphoric acid, in the containing sulfur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/02C25D11/08C25D11/24C25D11/16
CPCC25D11/024C25D11/16C25D11/24C25D11/246C25D11/08C25D11/18
Inventor 约翰尼斯·马里纳斯·玛利亚·德科克文森特·科内利斯·约翰尼斯·范登霍维尔
Owner FOKKER AEROSTRUCTURES