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Energy-saving and environment-friendly aluminum alloy anode oxide film stripping process

An anodic oxidation film, energy-saving and environmental protection technology, applied in the field of metal surface treatment, can solve the problems of high temperature, insufficient precision of film withdrawal, environmental hazards, etc., and achieve the effect of ensuring the use requirements, high precision of film withdrawal, and reducing energy consumption

Inactive Publication Date: 2013-09-18
BEIHANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Anodizing technology is one of the most commonly used technologies for aluminum alloy surface treatment to increase the corrosion resistance, hardness, wear resistance, and improve the decoration of the aluminum alloy surface. The film layer has defects and cannot meet the requirements of use, so it is necessary to remove the film layer and re-anodize
[0003] The traditional film removal process mostly uses phosphoric acid-chromic acid film removal, sulfuric acid-hydrofluoric acid film removal, sodium hydroxide film removal, etc., and there are the following problems: 1. It is relatively polluting to the environment, such as chromic acid is a strong carcinogen, It is extremely harmful to the environment; 2. The use temperature is high and the energy consumption is large; 3. The precision of film removal is not enough, especially in the presence of fluorine ions, if the film removal process is not controlled accurately enough, it will cause great damage to the substrate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Adopt proportioning ratio to be sulfuric acid 15g L -1 , oxalic acid 25g L -1 , corrosion inhibitor 20g L -1 , wherein the composition of the corrosion inhibitor is: adipate 15g L -1 , molybdate 30g L -1 . The anodized aluminum alloy samples were subjected to film removal treatment.

[0024] The 2A12 aluminum alloy with a sample size of 100×50×2mm was soaked in a film-removing solution at 40°C after traditional sulfuric acid anodization and boiling water sealing treatment. The film withdrawal time is 5-60 minutes, and the weight loss test is carried out every 5 minutes during this period. Five parallel samples were selected for each test point, and the average value was taken for the weight loss of the film.

[0025] figure 1 It is the curve of film weight loss over time. From the figure, it can be seen that the film layer removal under this process is roughly divided into two stages: Ⅰ. From the beginning point a to point b, the rising slope of weight loss in th...

Embodiment 2

[0028] Adopt proportioning ratio to be sulfuric acid 20g L -1 , oxalic acid 30g L -1 , corrosion inhibitor 30g L -1 , wherein the composition of the corrosion inhibitor is: adipate 10g L -1 , molybdate 25g L -1 . The anodized aluminum alloy samples were subjected to film removal treatment.

[0029] The 2A12 aluminum alloy with a sample size of 100 × 50 × 2 mm was immersed in a film-removing solution at 30 ° C after traditional sulfuric acid anodic oxidation and sealing treatment. The film withdrawal time is 5-60 minutes, and the weight loss test is carried out every 5 minutes during this period. Five parallel samples were selected for each test point, and the average value was taken for the weight loss of the film.

[0030] The weight loss-time curve of this process is divided into two stages: the film layer removal stage and the substrate corrosion stage. From the beginning of the film removal to the substrate corrosion stage after the film removal, the surface of the s...

Embodiment 3

[0032] Adopt proportioning ratio to be sulfuric acid 15g L -1 , oxalic acid 35g L -1 , corrosion inhibitor 30g L -1 , wherein the composition of the corrosion inhibitor is: adipate 15g L -1 , molybdate 25g L -1 . The anodized aluminum alloy samples were subjected to film removal treatment.

[0033] The 2A12 aluminum alloy with a sample size of 100×50×2mm was immersed in a film-removing solution at 35°C after traditional sulfuric acid anodization and sealing treatment. The film withdrawal time is 5-60 minutes, and the weight loss test is carried out every 5 minutes during this period. Five parallel samples were selected for each test point, and the average value was taken for the weight loss of the film.

[0034] The weight loss-time curve of this process is divided into two stages: the film layer removal stage and the substrate corrosion stage. From the beginning of the film removal to the substrate corrosion stage after the film removal, the surface of the sample is com...

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Abstract

The invention discloses an energy-saving and environment-friendly aluminum alloy anode oxide film stripping process. A film stripping solution used in the film stripping process is an environment-friendly mixed solution containing sulfuric acid, oxalic acid and a corrosion inhibitor, the operating temperature is 25-40 DEG C, and the film stripping time is 25-60min or the film stripping operation is carried out until all films are stripped. The film stripping solution comprises 10-40g / L of sulfuric acid, 10-50g / L of oxalic acid and 20-40g / L of corrosion inhibitor, wherein the corrosion inhibitor comprises 5-20g / L of adipate and 15-40g / L of ammonium molybdate. The energy-saving and environment-friendly aluminum alloy anode oxide film stripping process has the advantages of no hexavalent chromium, no environment pollution, lower usage temperature and less damage to a matrix, and is a novel energy-saving and environment-friendly aluminum alloy anode oxide film stripping process.

Description

technical field [0001] The invention belongs to an energy-saving and environment-friendly aluminum alloy anodic oxidation film removal process in the technical field of metal surface treatment. Background technique [0002] Anodizing technology is one of the most commonly used technologies for aluminum alloy surface treatment to increase the corrosion resistance, hardness, wear resistance, and improve the decoration of the aluminum alloy surface. The film layer is flawed and cannot meet the requirements for use, so it is necessary to remove the film layer and re-anodize it. [0003] The traditional film removal process mostly uses phosphoric acid-chromic acid film removal, sulfuric acid-hydrofluoric acid film removal, sodium hydroxide film removal, etc., and there are the following problems: 1. It is relatively polluting to the environment, such as chromic acid is a strong carcinogen, It is extremely harmful to the environment; 2. The use temperature is high and the energy ...

Claims

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Application Information

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IPC IPC(8): C23G1/06C23G1/12
Inventor 李松梅李英东于美刘建华杨茗佳毕荣荣赵建辉崔永信
Owner BEIHANG UNIV
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