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Bonding pretreatment method for aluminum alloy workpiece

A technology for aluminum alloys and workpieces, which is applied in the field of thermal control adhesive bonding pretreatment of aluminum alloy skins for space operations, and can solve problems such as low hemispherical emissivity and low solar light absorption rate

Active Publication Date: 2021-12-24
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] For this reason, the present invention solves the problems of low solar light absorption rate and low hemispherical emissivity in the existing phosphoric acid anodized structural bonding pretreatment by improving the thermal control bonding pretreatment method of aluminum alloy workpieces, so that the processed oxide film can Improve thermal control performance on the basis of satisfying adhesive performance

Method used

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  • Bonding pretreatment method for aluminum alloy workpiece
  • Bonding pretreatment method for aluminum alloy workpiece

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Example 1: 6 series aluminum alloy

[0032] (1) Workpiece pre-processing:

[0033] Degreasing, water washing, alkali etching, water washing, neutralization, and water washing are carried out sequentially to the aluminum alloy workpiece; wherein, in the step (1), the degreasing is ultrasonic degreasing, and the formula of the degreasing solution used during the degreasing treatment is: Na 3 PO 4 30g / L, NaOH 10g / L and NaOH 2 SO 4 14g / L; the degreasing treatment temperature is 55°C, and the degreasing treatment time is 7min.

[0034] Wherein, in the step (1), the formula of the alkali etching solution used in the alkali etching treatment is: NaOH 75g / L; the alkali etching treatment temperature is 50°C, and the alkali etching treatment time is 30s.

[0035] Wherein, in the step (1), the formula of the neutralizing solution adopted during the neutralization treatment is: HNO 3 230g / L, H 2 o 2 100g / L; the neutralization treatment temperature is 20°C, and the neutral...

Embodiment 2

[0042] Example 2: 5 series aluminum alloy

[0043] (1) Workpiece pre-processing:

[0044] Degreasing, water washing, alkali etching, water washing, neutralization, and water washing are carried out sequentially to the aluminum alloy workpiece; wherein, in the step (1), the degreasing is ultrasonic degreasing, and the formula of the degreasing solution used during the degreasing treatment is: Na 3 PO 4 30g / L, NaOH 10g / L and NaOH 2 SO 4 14g / L; the degreasing treatment temperature is 50°C, and the degreasing treatment time is 7min.

[0045] Wherein, in the step (1), the formula of the alkali etching solution used in the alkali etching treatment is: NaOH 75g / L; the alkali etching treatment temperature is 50°C, and the alkali etching treatment time is 30s.

[0046] Wherein, in the step (1), the formula of the neutralizing solution adopted during the neutralization treatment is: HNO 3 230g / L, H 2 o 2 100g / L; the neutralization treatment temperature is 20°C, and the neutral...

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Abstract

The invention provides a thermal control bonding pretreatment method for an aluminum alloy workpiece. The method comprises the following steps: (1) workpiece pretreatment: sequentially carrying out degreasing, water washing, alkali etching, water washing, neutralizing and water washing treatment on the aluminum alloy workpiece; and (2) anodizing treatment: putting the pretreated aluminum alloy workpiece into an anodizing tank to be subjected to anodizing treatment, so as to obtain an oxidation film, wherein the anodizing tank contains an anodizing tank solution, and the anodizing tank solution comprises 50-200 g / L of phosphoric acid, 10-130 g / L of sulfuric acid, 1-15 g / L of cerous sulfate, 10-45 g / L of boric acid and 0.5-20 g / L of magnesium phosphate. The aluminum alloy workpiece treated through the treatment method can meet the requirement for thermal control performance, the sunlight absorptivity of the aluminum alloy workpiece can reach 0.3, and the hemispherical emissivity of the aluminum alloy workpiece can reach 0.4.

Description

technical field [0001] The invention belongs to the field of surface treatment, in particular to a pre-treatment method for heat-controlled bonding of aluminum alloy skins used in space operations. Background technique [0002] Because there is no protection of the atmosphere in space, the intensity of sunlight (including infrared, visible, and ultraviolet light) is much higher than that on the earth, the temperature of the irradiated surface is high, and the temperature of the non-irradiated surface is low, and the temperature fluctuation range can reach -150°C to 150°C. Solar absorptivity (hereinafter referred to as absorptivity) is the ratio of the total intensity of ultraviolet light, visible light and infrared light absorbed by the surface to the incident intensity, which reflects the absorption capacity of the material surface for light from infrared to ultraviolet wavelengths. Hemispheric emissivity (hereinafter referred to as emissivity) is the ratio of the infrared ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/04C25D11/08C25D11/16
CPCC25D11/04C25D11/08C25D11/16
Inventor 崔耀文曹永智卢礼华张鹏郭锋王凯捷
Owner HARBIN INST OF TECH
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