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Anodic oxidation treating fluid containing corrosion inhibition additive

An anodic oxidation and additive technology, applied in anodic oxidation and other directions, can solve problems such as fatigue fracture, achieve the effects of fatigue life protection, increase film formation rate, and reduce sulfuric acid concentration

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

[0005] Aiming at the coarse local hole defects in the anodic oxidation film of aviation copper-containing aluminum alloy, which are easy to cause corrosion failure and fatigue fracture failure, the purpose of the present invention is to propose a ternary anodic oxidation bath solution and process system with the effect of suppressing local defects of the oxide film, And has the characteristics of environmental protection, low cost, stable process, etc.

Method used

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  • Anodic oxidation treating fluid containing corrosion inhibition additive
  • Anodic oxidation treating fluid containing corrosion inhibition additive
  • Anodic oxidation treating fluid containing corrosion inhibition additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 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;

[0035] 2. The anodic oxidation bath solution is 100ml of deionized water, adding 2.5ml of H with a mass percentage concentration of 98%. 2 SO 4 , 5g of adipic acid (fatty acid) modifier and 10mg of benzotriazole corrosion inhibitor;

[0036] Three, the specific steps are

[0037] Alkali washing step: immerse in NaOH aqueous solution at a temperature of 50°C for 1.5min to take it out, and rinse the surface of the sample with water; the NaOH aqueous solution is 100ml of tap water with 5.5g of NaOH added;

[0038] 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 ...

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] 2. The anodizing bath solution is 100ml of deionized water, adding 5ml of H with a mass percentage concentration of 98%. 2 SO 4 , 10g of ammonium adipate modifier and 20mg of 2-mercaptobenzothiazole corrosion inhibitor;

[0050] Three, the specific steps are

[0051] Alkali 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 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 ...

Embodiment 3

[0062] 1. The test material is 7050 bare aluminum plate, the heat treatment system is T7451 (7050-T7451), and the size is 100mm×50mm×4mm;

[0063] Two, the anodic oxidation tank solution is the 8-hydroxyquinoline corrosion inhibitor of 6ml of H2SO4, 30g of sodium adipate modifier and 50mg of mass percent concentration added in the deionized water of 100ml;

[0064] Three, the specific steps are

[0065] Alkali washing step: immerse in NaOH aqueous solution at a temperature of 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;

[0066] 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 concentra...

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Abstract

The invention discloses anodic oxidation treating fluid containing corrosion inhibition additive; the treating fluid is formed by adding 1.6-7.6ml of sulfuric acid, 5-30g of modifier and 10-100mg of corrosion inhibition additive in 100ml of deionized water; the modifier is adipic acid or adipate; the corrosion inhibition additive is benzotriazole, 2-mercaptobenzothiazole, dithizone or 8-oxyquinoline; the anodic oxidation treating fluid reduces the concentration of the sulfuric acid, reduces dissolving of bath solution to aerometal basal body and a generated oxidation film, and the corrosion inhibition additive is added for inhibiting excessive expansion of an oxidation film hole defect at the position of copper-bearing alloy phase particles. In the invention, the adipic acid or adipate which is environmental-protection and has low price replaces the using amount of the sulfuric acid, the film forming rate, the film layer compactness and uniformity of the anodic oxidation film are improved.

Description

technical field [0001] The invention relates to an anodic oxidation treatment liquid, more particularly, refers to a ternary anodic oxidation treatment liquid of sulfuric acid-adipic acid (salt)-corrosion inhibitor additive suitable for 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/08
Inventor 于美陈高红李松梅李永星李明刘建华
Owner BEIHANG UNIV
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