Sealing treatment method used in aluminum alloy surface treatment and sealing liquid used thereby

A technology of aluminum alloy surface and sealing treatment, applied in the direction of 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: 2014-08-27
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 used in aluminum alloy surface treatment and sealing liquid used thereby
  • Sealing treatment method used in aluminum alloy surface treatment and sealing liquid used thereby
  • Sealing treatment method used in aluminum alloy surface treatment and sealing liquid used thereby

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0020] In this embodiment, the 7075 aluminum alloy after anodic oxidation is sealed, and the specific method is as follows:

[0021] First hang the 7075 aluminum alloy with anodized film on the surface after anodic oxidation.

[0022] Then it was hung and immersed in the blocking solution at 50°C for 60 minutes; the composition of the blocking solution was: 5 g / L of cerium sulfate tetrahydrate, 1 g / L of lanthanum nitrate hexahydrate, and 0.5 g / L of ammonium persulfate.

[0023] Finally, the 7075 aluminum alloy is taken out, washed with water and dried.

[0024] The metallographic microscope photo of the 7075 aluminum alloy surface after the sealing treatment of this embodiment is shown in figure 1 .

[0025] Depend on figure 1 It can be seen that the surface of the 7075 aluminum alloy after the sealing treatment in this embodiment is uniform, without iridescent color, dense in structure and non-porous.

[0026] The salt spray corrosion test and the spotting corrosion test ...

Embodiment 2～ Embodiment 5）

[0030] Each embodiment is basically the same as Embodiment 1, and the differences are shown in Table 1.

[0031] Table 1

[0032] Example 1 Example 2 Example 3 Example 4 Example 5 aluminum alloy 7075 aluminum alloy 7075 aluminum alloy 7075 aluminum alloy 7075 aluminum alloy 7075 aluminum alloy Cerium Sulfate 15g / L 5g / L 25g / L 15g / L 15g / L Lanthanum nitrate 3g / L 1g / L 5g / L 3g / L 3g / L Ammonium persulfate 1.5g / L 0.5g / L 2.5g / L 1.5g / L 1.5g / L Blocking fluid temperature 50℃ 50℃ 50℃ 40℃ 60℃ Soaking time 60min 60min 60min 70min 50min Salt spray resistance time 153h 149h 151h 152h 153h drip time 12.56s 12.49s 12.52s 12.51s 12.53s

Embodiment 6）

[0034] In this embodiment, the anodized 6063 aluminum alloy is sealed, and the specific method is the same as that in Embodiment 1.

[0035] The metallographic microscope photo of the 6063 aluminum alloy surface after the sealing treatment of this embodiment is shown in figure 2 .

[0036] Depend on figure 2 It can be seen that the surface of the 6063 aluminum alloy after the sealing treatment in this embodiment is uniform, without iridescent color, dense in structure, and non-porous.

[0037] The salt spray corrosion test and the spotting corrosion test were carried out on the anodized film on the surface of the 6063 aluminum alloy after the sealing treatment in this embodiment, and the results are shown in Table 2.

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Abstract

The invention discloses a sealing treatment method used in aluminum alloy surface treatment and a sealing liquid used in the sealing treatment method. The sealing treatment method comprises the following steps: soaking an aluminum alloy after surface treatment in the sealing liquid, taking out, washing in water and drying, wherein the sealing liquid is prepared from the following components in concentration: 5-25g / L cerium sulfate tetrahydrate, 1-5g / L lanthanum nitrate hexahydrate and 0.5-2.5g / L ammonium persulfate, the soaking time is 50-70 minutes, and the temperature of the sealing liquid is 40-60 DEG C. The sealing liquid disclosed by the invention is not only friendly to environment and human bodies, but also capable of greatly improving the corrosion resistance of an oxidation film after the sealing treatment.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy surface treatment, and in particular relates to a sealing treatment method in aluminum alloy surface treatment and a sealing liquid adopted therefor. Background technique [0002] 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. [0003] According to the different sealing liquids, commonly used sealing treatment methods mainly include: nickel-fluorine system method, potassium dichromate method, dilute chromic acid sealing method and rare earth sealing method. [0004] Among them, the advantages of nickel-fluorine system method, potassium dichromate method and dilute chromic acid sealing method are that the oxide film after sealing treatment has good corrosi...

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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