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A method for preparing titanium/selenium colorful composite conversion film on the surface of aluminum alloy

A technology of aluminum alloy surface and conversion film, applied in the direction of metal material coating process, etc., can solve the problems of unsatisfactory corrosion resistance, high cost of passivation solution and poor passivation effect, etc., and achieve low production cost, Ease of daily maintenance and easy control of process parameters

Active Publication Date: 2018-04-06
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its corrosion resistance is still lower than that of chromate film, and it is almost colorless and difficult to distinguish, which brings certain difficulties to industrial operations.
[0006] However, these existing aluminum and aluminum alloy chromium-free passivation methods always have some shortcomings, such as: corrosion resistance cannot meet the needs of actual production and life, the passivation effect is not good, and the high cost of passivation solution is not conducive to large-scale production etc.

Method used

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  • A method for preparing titanium/selenium colorful composite conversion film on the surface of aluminum alloy
  • A method for preparing titanium/selenium colorful composite conversion film on the surface of aluminum alloy
  • A method for preparing titanium/selenium colorful composite conversion film on the surface of aluminum alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Use 600#, 800#, 1000#, 1200# and 2000# sandpaper to pre-grind the surface of the A6016 aluminum alloy with a size of 20mmX10mmX3mm; place the pre-grinded aluminum alloy in an alkaline degreasing solution at a temperature of 30°C Carry out the degreasing operation for 5 minutes; the composition of the alkaline degreasing solution is 5g of sodium silicate, 10g of sodium hydroxide, 10g of sodium carbonate per liter, and the rest is deionized water; the aluminum alloy after degreasing is placed at a temperature of 20°C Activated in the activation solution for 30s, the activation solution is 20ml per liter of hydrofluoric acid solution, 20ml of hydrochloric acid solution; 0.1g of potassium titanate, 0.1g of selenium dioxide, and 0.1g, 0.1g sodium fluoride, 0.1g magnesium sulfate, and the balance is the ratio of deionized water. Mix the above-mentioned substances, stir until uniform in a corrosion-resistant container, and then filter to obtain the film-forming liquid. The pH ...

Embodiment 2

[0043] Use 600#, 800#, 1000#, 1200# and 2000# sandpaper to pre-grind the surface of the A6016 aluminum alloy with a size of 15mmX10mmX5mm; place the pre-grinded aluminum alloy in an alkaline degreasing solution at a temperature of 70°C Carry out the degreasing operation for 20 minutes; the composition of the alkaline degreasing solution is 25 g of sodium silicate, 15 g of sodium hydroxide, 15 g of sodium carbonate per liter, and the rest is deionized water; the degreasing aluminum alloy is placed at a temperature of 50 ° C Activated in the activation solution for 25s, the activation solution is 30ml per liter of hydrofluoric acid solution, 25ml of hydrochloric acid solution; 5g of sodium titanate, 8g of selenium trioxide, 10g of carboxylic acid, fluorine Potassium chloride 10g, ferric sulfate 8g, the balance is the proportion of deionized water, mix the above-mentioned substances, in a corrosion-resistant container, stir until uniform, and then filter to obtain the film-forming...

Embodiment 3

[0045] Use 600#, 800#, 1000#, 1200# and 2000# sandpaper to pre-grind the surface of the A6016 aluminum alloy with a size of 20mmX15mmX3mm; place the pre-grinded aluminum alloy in an alkaline degreasing solution at a temperature of 35°C Carry out the degreasing operation for 12 minutes; the composition of the alkaline degreasing solution is 10 g of sodium silicate, 11 g of sodium hydroxide, 13 g of sodium carbonate per liter, and the rest is deionized water; the degreasing aluminum alloy is placed at a temperature of 35 ° C Activated in the activation solution for 30s, the activation solution is 50ml per liter of hydrofluoric acid solution, 35ml of hydrochloric acid solution; Sodium fluoride and potassium fluoride are mixed according to 1:1, a total of 1g is mixed, copper sulfate is 1g, and the balance is the proportion of deionized water. Mix the above-mentioned substances, stir them in a corrosion-resistant container until they are uniform, and then filter. The film-forming s...

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Abstract

The invention discloses a method for preparing a titanium / selenium multicolour composite conversion film on the surface of an aluminium alloy. The method mainly comprises the following steps: preparing film-forming solution according to a ratio that per cubic litre of the film-forming solution contains 0.1-5g of titanates, 0.1-8g of selenium oxides or selenates, 0.1-10g of organic acids, 0.1-10g of an auxiliary oxidant, 0.1-8g of a film-forming accelerant and the balance deionized water, and carrying out degreasing and activating treatments on pre-grinded aluminium alloy; placing the aluminium alloy in the film-forming solution at 10-60 DEG C and carrying out conversion treatment for 5-30min, then taking out the aluminium alloy and cleaning the aluminium alloy with distilled water, blow-drying the aluminium alloy by natural wind and then obtaining the Ti-Se multicolour composite conversion film on the surface of the aluminium alloy. The method disclosed by the invention is low in cost, simple to operate, capable of improving the corrosion resistance of the aluminium alloy, quite high in environmental value, and easy to produce.

Description

technical field [0001] The invention relates to a method for treating a chemical conversion film on a metal surface. Background technique [0002] Aluminum and aluminum alloys are more and more widely used in various fields of the national economy, especially higher requirements for surface decoration and corrosion resistance. The oxide film of aluminum has a protective effect on the aluminum substrate, but the protective effect of the natural oxide of aluminum is very limited, the humidity and salt in the atmosphere will obviously accelerate the corrosion, and because the linear expansion coefficient of aluminum and its alloys is large, the metal activity Generally, the surface is treated by oxidation method. Chemical oxidation treatment is one of the surface oxidation treatment technologies for aluminum alloys. Currently, the chromate chemical oxidation process, which is widely used, has serious problems such as high toxicity and environmental pollution. In today’s increa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/34C23C22/68
CPCC23C22/34C23C22/68
Inventor 于升学于强邢茜邵光杰闫会佐
Owner YANSHAN UNIV
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