Sulfuric acid-boric acid-additive ternary anodizing fluid

An anodizing and additive technology, applied in anodizing and other directions, can solve problems such as fatigue fracture and corrosion failure, and achieve the effect of satisfying the corrosion resistance of the film layer, reducing the current concentration tendency, and reducing the control accuracy requirements.

Inactive Publication Date: 2010-08-04
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this binary system can only modify the inherent porous structure of the oxide film, and cannot specifically suppress the coarse pore defects caused by the copper-containing alloy phase particles in the aerospace aluminum alloy. These coarse pores in the oxide film Defects remain the primary sites of initiation leading to corrosion failures and fatigue fracture failures

Method used

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  • Sulfuric acid-boric acid-additive ternary anodizing fluid
  • Sulfuric acid-boric acid-additive ternary anodizing fluid
  • Sulfuric acid-boric acid-additive ternary anodizing fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. The test material is brand 2024 bare aluminum plate, the heat treatment system is T3 (2024-T3), and the size is 100mm×50mm×2.5mm;

[0034] 2. The anodizing bath solution is 100ml of deionized water, adding 2ml of H with a mass percentage concentration of 98%. 2 SO 4 , 0.2g of boric acid and 10mg of benzotriazole corrosion inhibitor;

[0035] Three, the specific steps are

[0036] Alkali washing step: immerse in NaOH aqueous solution at 55°C for 2 minutes to take it out, and rinse the surface of the sample with water; NaOH aqueous solution is 100ml of tap water with 5.5g of NaOH added;

[0037] Light-emitting step: put the sample treated by the alkali washing step into the three-acid light-emitting solution at 20°C for 2 minutes, take it out, and rinse the surface of the sample with deionized water; add 5g of CrO to 100ml of the three-acid light-emitting solution 3 , 8ml of HNO 3 , 1 ml of HF. CrO 3 For analytical purity. HNO 3 The mass percent concentration i...

Embodiment 2

[0048] 1. The test material is brand 2024 bare aluminum plate, the heat treatment system is T3 (2024-T3), and the size is 100mm×50mm×2.5mm;

[0049] Two, the anodic oxidation tank solution is the 2-mercaptobenzothiazole corrosion inhibitor of 4ml of H2SO4, 0.5g of boric acid and 50mg of mass percentage concentration added in the deionized water of 100ml;

[0050] Three, the specific steps are

[0051] Alkaline washing step: immerse in NaOH aqueous solution at a temperature of 50°C for 2 minutes to take it out, and rinse the surface of the sample with water; the NaOH aqueous solution is 100ml of tap water with 6g of NaOH added;

[0052] Light-emitting step: put the sample treated by the alkali washing step into the tri-acid light-emitting solution at 25°C for 1 min, take it out, and rinse the surface of the sample with deionized water; add 6g of CrO to 100ml of the three-acid light-emitting solution 3 , 6ml of HNO 3 , 0.8ml of HF. HNO 3 The mass percent concentration is 65%...

Embodiment 3

[0061] 1. The test material is 7050 bare aluminum plate, the heat treatment system is T7451 (7050-T7451), and the size is 100mm×50mm×4mm;

[0062] 2. The anodizing bath solution is 100ml of deionized water, adding 6ml of H with a mass percentage concentration of 98%. 2 SO 4 , 0.8g of boric acid and 70mg of 8-hydroxyquinoline corrosion inhibitor;

[0063] Three, the specific steps are

[0064] Alkaline washing step: immerse in NaOH aqueous solution at a temperature of 60°C for 1min to take it out, and rinse the surface of the sample with water; NaOH aqueous solution is 100ml of tap water with 5.5g of NaOH added;

[0065] Light-emitting step: put the sample treated by the alkali washing step into the three-acid light-emitting solution at a temperature of 15°C for 3 minutes, take it out, and rinse the surface of the sample with deionized water; add 4g of CrO 3 , 7ml of HNO 3 , 1.2ml of HF. HNO 3 The mass percent concentration is 65%. The mass percent concentration of HF i...

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Abstract

The invention discloses a sulfuric acid-boric acid-additive ternary anodizing fluid, which is prepared by adding 1.6-7.6ml of sulfuric acid, 0.1-1.1g of boric acid and 5-100mg of additive into 100ml of deionized water. The additive is benzotriazole, 2-mercaptobenzothiazole, dithizone or 8-oxyquinoline. The anodizing fluid of the invention is the improvement of aluminium and aluminium alloy sulfuric acid-boric acid binary anodizing fluid, and cupreous efficient cathodic corrosion inhibitor is added to enable that preferential adsorption of the corrosion inhibitor is carried out on the copper-containing particle position of an aviation aluminum alloy surface, thus forming a compact reticulatepattern complexing product, providing targeted protection on copper-containing aluminum alloy phase particles, decreasing the current concentration tendency, and inhibiting excessive growth of oxidation film cavern defect at the position of the copper-containing aluminum alloy phase particles.

Description

technical field [0001] The invention relates to an anodic oxidation treatment solution, more particularly, a sulfuric acid-boric acid-additive ternary anodic oxidation treatment solution suitable for anodic oxidation treatment of aviation copper-containing aluminum alloys. Background technique [0002] Aluminum and aluminum alloys are widely used due to their excellent comprehensive properties, especially in the field of aviation, aluminum alloys have always been the most important structural materials. However, aluminum alloys are easily corroded in humid atmospheres, especially in air containing salt. Therefore, aluminum and aluminum alloy components are usually anodized in an acidic solution to prepare a porous oxide film on the surface to increase the bonding performance of the external coating. . The porous oxide film can also improve the corrosion resistance of aluminum and aluminum alloy components through sealing treatment. [0003] Aviation general-purpose aluminu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/08
Inventor 刘建华李明李松梅于美李英东陈高红
Owner BEIHANG UNIV
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