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Sealing treatment method for aluminium alloy surface treatment

A technology of aluminum alloy surface and sealing treatment, applied in surface reaction electrolytic coating, metal material coating process, electrolytic coating, etc., can solve the problem of unsatisfactory corrosion resistance of oxide film, achieve compact structure and improve corrosion resistance , the effect of uniform surface

Active Publication Date: 2016-12-07
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The deficiency of this document is that the corrosion resistance of the oxide film treated by this sealing agent is still unsatisfactory

Method used

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  • Sealing treatment method for aluminium alloy surface treatment
  • Sealing treatment method for aluminium alloy surface treatment
  • Sealing treatment method for aluminium alloy surface treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0021] In this embodiment, the anodized 7075 aluminum alloy is sealed, and the specific method is as follows:

[0022] First, hang the 7075 aluminum alloy with anodized film on its surface after being anodized.

[0023] Then it was hung in a sealing solution at 50° C. and soaked for 60 minutes; the composition of the sealing solution was 5 g / L cerium sulfate tetrahydrate, 1 g / L lanthanum nitrate hexahydrate and 0.5 g / L ammonium persulfate.

[0024] Finally, the 7075 aluminum alloy is taken out, washed with water and dried.

[0025] The metallographic microscope picture of the 7075 aluminum alloy surface after the sealing treatment of this embodiment is shown figure 1 .

[0026] by figure 1 It can be seen that the surface of the 7075 aluminum alloy after the sealing treatment of this embodiment is uniform, no iridescent color, and dense and non-porous.

[0027] Salt spray corrosion test and spot corrosion test were performed on the anodic oxide film on the surface of 7075 aluminum alloy a...

Embodiment 2～ Embodiment 5）

[0031] Each embodiment is basically the same as embodiment 1, and the differences are shown in Table 1.

[0032] Table 1

[0033]

Embodiment 6）

[0035] In this embodiment, the anodized 6063 aluminum alloy is sealed, and the specific method is the same as in embodiment 1.

[0036] The metallographic microscope picture of the 6063 aluminum alloy surface after the sealing treatment of this embodiment is shown figure 2 .

[0037] by figure 2 It can be seen that the surface of the 6063 aluminum alloy after the sealing treatment of this embodiment is uniform, no iridescent color, and the structure is dense and non-porous.

[0038] The salt spray corrosion test and spot corrosion test were performed on the anodic oxide film on the surface of the 6063 aluminum alloy after the sealing treatment in this example. The results are shown in Table 2.

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Abstract

The invention discloses a sealing treatment method for aluminium alloy surface treatment. According to the sealing treatment method, aluminium alloy subjected to surface treatment is placed in confining liquid to be soaked and then is washed by water and dried after being taken out. The confining liquid is composed of, by concentration parts, 15 g / L of cerous sulfate tetrahydrate, 3 g / L of lanthanum nitrate hexahydrate and 1.5 g / L of ammonium persulfate. The soaking time is 60 min, and the temperature of the confining liquid is 50 DEG C. The surface treatment is anodic oxidation. On the one hand, cerous sulfate is used for replacing cerous nitrate to constitute rare-earth salt with lanthanum nitrate; and on the other hand, ammonium persulfate is used for replacing oxidizing agents such as potassium permanganate to constitute rear-earth confining liquid with the rare-earth salt. The rare-earth confining liquid is friendly to the environment and human bodies, and the corrosion resistance of an oxidation film subjected to sealing treatment can be greatly improved.

Description

[0001] This application is a divisional application of the invention patent application whose application number is 201410220061.9, the filing date is May 22, 2014, and the invention-creation title is "The sealing treatment method in the surface treatment of aluminum alloy and the sealing liquid used". Technical field [0002] The invention belongs to the technical field of surface treatment of aluminum alloys, and specifically relates to a sealing treatment method in the surface treatment of aluminum alloys and a sealing liquid used in the sealing treatment. Background technique [0003] The surface treatment of aluminum alloy mainly includes anodic oxidation and chemical oxidation, in which pretreatment is required before oxidation, and sealing treatment is required after oxidation. The sealing treatment is mainly to improve the corrosion resistance of the oxide film. [0004] According to the different sealing solutions, the commonly used sealing treatment methods mainly include: ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/18C23C22/82
CPCC23C22/82C25D11/18
Inventor 马迪齐轩李树白
Owner JIANGSU UNIV OF TECH
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