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Aluminum Alloy Hard Anodic Oxidation Film and Its Process Method

A kind of hard anodic oxidation, process method technology, applied in electrolytic coatings, surface reaction electrolytic coatings, coatings and other directions, can solve problems such as unfavorable environmental protection and energy saving, limited oxide film thickness and performance, and achieve environmental protection, The effect of fast film formation and low acid concentration

Inactive Publication Date: 2011-12-21
XIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to obtain high-quality oxide films and production efficiency, different types of electrolytes, additives, current densities, and voltage waveforms (such as DC superimposed pulses or positive and negative pulses) are used in hard oxidation of aluminum alloys, but this is not conducive to environmental protection and energy saving, and the film thickness and performance of the oxide film are still very limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1 aluminum alloy 5052 plate (200 * 150 * 2mm 3 ) for hard anodizing:

[0017] (1) The surface of the aluminum alloy 5052 plate after degreasing, degreasing and cleaning is shot blasted for 5 minutes with clean stainless steel shot in the shot blasting machine. The particle size of the stainless steel shot is 100-120 mesh, and then used Rinse with water and dry.

[0018] (2) Preparation of low sulfuric acid concentration electrolyte, obtaining sulfuric acid concentration is 30g / L, aluminum sulfate is 70g / L, tartaric acid is 40g / L and ethylene glycol is 150g / L, all the other are distilled water or deionized water.

[0019] (3) Carry out hard anodic oxidation in a low sulfuric acid concentration electrolyte, the temperature of the electrolyte is controlled at -1-1°C, the current adopts a constant direct current, and the hard anodic oxidation is carried out according to the following process steps to obtain an oxide film:

[0020] ①Adopt low current density 2A / ...

Embodiment 2

[0024] Embodiment 2 aluminum alloy 2024 plate (200 * 150 * 2mm 3 ) for hard anodizing:

[0025] (1) The aluminum alloy 2024 plate after degreasing, degreasing and cleaning is subjected to shot blasting treatment for 7 minutes in a shot blasting machine with clean stainless steel shot, the particle size of the stainless steel shot is 150-200 mesh, and then Aluminum alloy workpieces are washed with clean water and dried.

[0026] (2) preparation low sulfuric acid concentration electrolyte, obtaining sulfuric acid concentration is that sulfuric acid concentration is 50g / L, aluminum sulfate is 80g / L, tartaric acid is 40g / L and ethylene glycol is 200g / L, all the other are distilled water or deionized water.

[0027] (3) Perform hard anodic oxidation on the aluminum alloy 2024 plate after shot blasting in the prepared low sulfuric acid concentration electrolyte. The temperature of the electrolyte is kept at -3--1°C, and the current adopts a constant DC current, according to the fol...

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Abstract

The invention relates to an aluminum alloy hard anodized film and a process method thereof. After degreasing and degreasing, the surface of the aluminum alloy workpiece is shot peened with clean stainless steel shot, and then hard anodized in an electrolyte with low sulfuric acid concentration, and hard anodized with low current density and then high current density The hard oxide film is obtained after treatment, the thickness of the oxide film is 340-374 μm, and the hardness is high, the film layer is dense, and it is beneficial to environmental protection and cost reduction.

Description

technical field [0001] The invention relates to aluminum alloy surface treatment, in particular to the field of hard anodic oxidation treatment with sulfuric acid electrolyte. Background technique [0002] Aluminum alloy hard anodic oxide film has excellent properties such as high hardness, corrosion resistance, insulation, light function, etc. It is widely used in the fields of automobile, machinery, electronics and aerospace, such as engine aluminum piston, scroll compressor After hard oxidation of parts such as discs and aluminum cylinders, the wear resistance and corrosion resistance can be improved. The micropores in the oxide film can be used to prepare composite membranes, filter membranes, and functional membranes. They can also be used as catalyst carriers and templates to synthesize nanomaterials, etc. . [0003] Common hard anodizing uses a high-concentration sulfuric acid electrolyte, such as an electrolyte with a sulfuric acid content of 150-300g / L. It is gene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/16
Inventor 魏晓伟曾明顾琳
Owner XIHUA UNIV
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