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Method for preparing aluminum alloy colored composite film

An aluminum alloy and composite membrane technology, applied in anodizing, electrolytic coating, surface reaction electrolytic coating, etc., can solve the problems of increasing the difficulty of controlling the composition of the electrolyte, the complex composition of the electrolyte, and increasing the current conversion steps, etc. Reduce labor time cost and labor cost, reduce preparation process time, and promote the effect of adsorption

Active Publication Date: 2010-09-15
苏州盛泽科技创业园发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the anodic oxidation of this technical solution is carried out under direct current, and the electrolytic coloring is carried out under alternating current, which needs to increase the conversion step of the current and increase the current conversion device
On the other hand, it can be seen from the composition of the aforementioned electrolyte that the composition of the electrolyte is relatively complex, which increases the difficulty of controlling the composition of the electrolyte and also increases the cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for preparing an aluminum alloy cladding, comprising the following steps: using LY12 hard aluminum alloy as a substrate, grinding it with water sandpaper, and mechanically polishing it with a polishing machine; then using a NaOH aqueous solution with a concentration of 50g / L at 40°C for 1min alkaline etching treatment ; After washing with distilled water and drying at room temperature, place in 85% H 3 PO 4 , 98%H 2 SO 4 , 65% HNO 3 In the mixed solution (tri-acid light emitting solution) prepared in a ratio of 7:4:1, soak at room temperature for 90s, and then wash the sample with distilled water and dry at room temperature;

[0031] Then the sample is used as the anode, and the same sample is used as the cathode, and the ratio of the area of ​​the cathode to the anode is kept at 1.5:1, and placed in the composite electrolyte at a temperature of 20 ° C. The composition of the composite electrolyte is: H 2 SO 4 1000g / L, CuSO 4 200g / L, EDTA is 40g / L, and th...

Embodiment 2

[0033] A method for preparing an aluminum alloy cladding, comprising the following steps: using LY12 hard aluminum alloy as a substrate, grinding with water sandpaper, and mechanically polishing with a polishing machine; then using a NaOH aqueous solution with a concentration of 52g / L at 43°C for 2min alkaline etching treatment ; After washing with distilled water and drying at room temperature, place in 85% H 3 PO 4 , 98%H 2 SO4 , 65% HNO 3 In the mixed solution (tri-acid light emitting solution) prepared in a ratio of 7:4:1, soak at room temperature for 100s, and then wash the sample with distilled water and dry at room temperature;

[0034] Then the sample is used as the anode, and the same sample is used as the cathode, and the ratio of the area of ​​the cathode to the anode is kept at 1.6:1, and placed in the composite electrolyte at a temperature of 22 ° C. The composition of the composite electrolyte is: H 2 SO 4 1100g / L, CuSO 4 EDTA is 225g / L, EDTA is 41.063g / L, a...

Embodiment 3

[0036] A method for preparing an aluminum alloy cladding, comprising the following steps: using LY12 hard aluminum alloy as a substrate, grinding it with water sandpaper, and mechanically polishing it with a polishing machine; then using an aqueous NaOH solution with a concentration of 55g / L at 45°C for 3 minutes for alkaline etching treatment ; After washing with distilled water and drying at room temperature, place in 85% H 3 PO 4 , 98%H 2 SO 4 , 65% HNO 3 In the mixed solution (tri-acid light emitting solution) prepared in a ratio of 7:4:1, soak for 105s at room temperature, and then wash the sample with distilled water and dry at room temperature;

[0037] Then anodize in a sulfuric acid solution, use the sample as the anode, use the same sample as the cathode, keep the ratio of the area of ​​the cathode to the anode at 1.8:1, in 180g / L H2SO4 solution at 25°C, 1A / cm 2 Oxidation at a current density of 30 minutes to obtain an anodic oxide film with a thickness of more t...

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Abstract

The invention discloses a method for preparing an aluminum alloy colored composite film. The method comprises pretreatment and direct-current electrolytic coloring; the direct-current electrolytic coloring adopts composite electrolyte consisting of H2SO4, CuSO4, EDTA and water, wherein the H2SO4 is 1,000 to 1,200g / L, the CuSO4 is 200 to 300g / L, the EDTA is 40 to 55g / L, the balance is water, and the pH value of the solution is less than or equal to 4.5; the coloring is performed at the constant current density of 0.5 to 0.6A / cm<2> and the temperature of between 20 and 30 DEG C, and the area ratio of a cathode to an anode is (1.5-2): 1; and a direct-current anode oxidation step can be added before the direct-current electrolytic coloring. The method has the advantages of simple preparation process, safe production operation and low production cost; and the obtained colored film has good corrosion resistance, and meets the decorative requirement.

Description

technical field [0001] The invention relates to an electrolytic production process for coating, in particular to an electrolytic reaction method for forming a colored layer on the surface of an aluminum alloy. Background technique [0002] Due to its high strength and weight ratio, easy forming and processing, and excellent physical and chemical properties, aluminum and its alloy materials have become the second largest category of metal materials used in industry after steel; at the same time, due to the low hardness of aluminum alloy materials , Poor wear resistance, which often occurs abrasive damage. Therefore, aluminum alloys are often subjected to corresponding surface treatment before use to meet their adaptability and safety to the environment, reduce abrasion, and prolong their service life. [0003] Aluminum alloy anodic oxidation electrolytic coloring is one of the important methods in aluminum alloy surface treatment. At present, anodic oxidation is more and mo...

Claims

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Application Information

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IPC IPC(8): C25D11/08C25D11/16
Inventor 高志明林峰
Owner 苏州盛泽科技创业园发展有限公司
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