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Aluminium alloy hard anodizing electrolyte and method

A hard anodizing, electrolyte technology, applied in anodizing, electrolytic coatings, surface reaction electrolytic coatings, etc., can solve the problems of reducing the free energy of the system, easy agglomeration and growth of nanoparticles, and inaccessibility of lubricating particles.

Active Publication Date: 2013-01-23
MITAC PRECISION TECH(KUNSHAN) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are a large number of nanoscale pores distributed on the surface of aluminum or aluminum alloy after anodic oxidation, and there is a high free energy. However, the surface free energy of the solid surface cannot be reduced by reducing the surface area like a liquid, and can only be reduced by absorbing external media. free energy of the system
Therefore, in order to obtain a hard anodized film with lubricity, the traditional method is to soak the aluminum or aluminum alloy after anodization in the aqueous dispersion of nano-lubricating particles. However, the disadvantage of this method is that the nanoparticles are easy to agglomerate and grow. When the particle diameter is larger than the diameter of the pores of the oxide film, the lubricating particles cannot enter the pores formed by anodic oxidation, thus affecting the lubricating effect of the anodic oxide film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Dip the aluminum alloy workpiece after degreasing, alkali biting, neutralization, polishing and neutralization into the acid bath for 60min hard anodic oxidation treatment, the voltage is 30V, and the current density is 2.5A / dm 2 , the treatment temperature is 19-21°C, and the electrolyte used in hard anodizing includes the following components per liter:

[0041] (a) 100g of sulfuric acid;

[0042] (b) Malonic acid 20g;

[0043] (c) oxalic acid 20g;

[0044] (d) Glycerin 2g;

[0045] Then put the hard anodized aluminum alloy workpiece into the mixed solution of sulfuric acid and ammonium tetrathiomolybdate as the electrolyte, and conduct the second anodic oxidation treatment with aluminum as the cathode, and the treatment temperature is 22-24°C , the voltage is 18V, the current density is 0.25A / dm 2 , the treatment time is 60s, through the second anodic oxidation, the inner wall of the anodized micropores reacts to generate solid molybdenum disulfide, thereby obtai...

Embodiment 2

[0047] Dip the aluminum alloy workpiece after degreasing, alkali biting, neutralization, polishing and neutralization into the acid bath for 120min, with a voltage of 60V and a current density of 3.0A / dm 2 , the treatment temperature is 17-19°C, and the electrolyte used in hard anodizing includes the following components per liter:

[0048] (a) 80g of sulfuric acid;

[0049] (b) Malonic acid 30g;

[0050] (c) 30g of oxalic acid;

[0051] (d) Glycerin 5g;

[0052] Then put the hard anodized aluminum alloy workpiece into the mixed solution of sulfuric acid and ammonium tetrathiomolybdate as the electrolyte, and conduct the second anodic oxidation treatment with graphite as the cathode, and the treatment temperature is 22-24°C , the voltage is 13V, the current density is 1.5A / dm 2 , the treatment time is 150s, through the second anodic oxidation, the inner wall of the anodized micropores reacts to generate solid molybdenum disulfide, thereby obtaining an anodized film with a ...

Embodiment 3

[0054] Dip the aluminum alloy workpiece after degreasing, alkali biting, neutralization, polishing and neutralization into the acid bath for 250min, the voltage is 90V, and the current density is 2.5~3.0A / dm 2 , the treatment temperature is 15-17°C, and the electrolyte used in hard anodizing includes the following components per liter:

[0055] (a) 50g of sulfuric acid;

[0056] (b) 40g of malonic acid;

[0057] (c) 30g of oxalic acid;

[0058] (d) Glycerin 6g;

[0059] Then put the hard anodized aluminum alloy workpiece into the mixed solution of sulfuric acid and ammonium tetrathiomolybdate as the electrolyte, and conduct the second anodic oxidation treatment with graphite as the cathode, and the treatment temperature is 22-24°C , the voltage is 15V, the current density is 3A / dm 2 , the treatment time is 300s, through the second anodic oxidation, the inner wall of the anodized micropores reacts to generate solid molybdenum disulfide, thereby obtaining an anodic oxide fil...

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Abstract

An aluminium alloy hard anodizing electrolyte and a method. The method comprises the following steps: degreasing, alkali biting, neutralizing, polishing, neutralizing, hard anodizing, secondary anodizing, sealing holes and drying. The hard anodizing electrolyte used in the hard anodizing comprises the following components per liter: (a) 50 to 100 g of sulfuric acid, (b) 20 to 40 g of propane diacid, (c) 10 to 30 g of oxalic acid, and (d) 1 to 10 g of glycerin. The aluminium alloy hard anodizing electrolyte and the method can produce a hard anodic oxide film with lubricity.

Description

【Technical field】 [0001] The invention relates to an aluminum alloy hard anodic oxidation electrolyte and a method, and in particular to an electrolyte and a method for preparing a lubricating hard anodic oxidation film. 【Background technique】 [0002] There are many electrolytic methods for hard anodic oxidation, and currently widely used are (1) sulfuric acid hard anodic oxidation; (2) oxalic acid hard anodic oxidation; (3) mixed acid hard anodic oxidation. [0003] Due to the defects of soft surface, poor wear resistance and high friction coefficient of aluminum alloy materials, it is necessary to carry out tribological surface modification treatment of aluminum and aluminum alloys during use, that is, hard anodic oxidation is first performed on the surface of aluminum alloys, and then Various lubricating substances are deposited on the surface and inside of the alloy film to form a lubricating coating, thereby reducing the friction coefficient of the aluminum alloy surfa...

Claims

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Application Information

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IPC IPC(8): C25D11/06C25D11/12
Inventor 郭雪梅
Owner MITAC PRECISION TECH(KUNSHAN) CORP
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