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Passivation technology of aluminum alloy cylinder cover

An aluminum alloy and process technology, which is applied in the field of passivation technology of aluminum alloy cylinder heads, can solve the problems of low concentration of dissolved titanium ions, inability to achieve industrial continuous production requirements, and inability to guarantee the quality of the film, etc. The effect of saving industrial production time and energy, cost reduction

Inactive Publication Date: 2014-12-31
无锡杨市表面处理科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the "chromium-free conversion coating" announced by U.S. Patent 6,638,369, its treatment solution has the advantage of not containing hexavalent chromium, and the fluoride in the same range as the existing hexavalent chromium conversion process has been added to the treatment solution, but due to The sodium titanate or potassium titanate used in this process has extremely low solubility in water, so the effective concentration of dissolved titanium ions is low, which cannot guarantee the quality of the film in the continuous production process, cannot meet the requirements of industrial continuous production, and contains extremely toxic Potassium ferricyanide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of passivation process of aluminum alloy cylinder head, the composition of the passivation liquid that described passivation process adopts is: sodium silicate 4g / L, titanium dioxide 15g / L, 68% nitric acid 20g / L, potassium permanganate 17g / L, sodium peroxide 3g / L, ammonium bifluoride 8g / L, ferrous chloride 22g / L, chromium nitrate 9g / L, zirconium nitrate 3g / L, sodium dodecylsulfonate 16g / L, balance For water, the passivation process is:

[0019] 1) Put the aluminum alloy cylinder head into the alkaline cleaning solution for surface alkaline cleaning. The alkaline cleaning solution is composed of 12% sodium hydroxide and 12% sodium carbonate at a temperature of 35°C for 5 minutes, and then rinse with water;

[0020] 2) Put the aluminum alloy cylinder head into the pickling solution, which is composed of 14% nitric acid and 8% acetic acid; the temperature is room temperature, the time is 3 minutes, and then rinse with water;

[0021] 3) Prepare a passivation solut...

Embodiment 2

[0023] A kind of passivation process of aluminum alloy cylinder head, the composition of the passivation solution that described passivation process adopts is: sodium silicate 6g / L, titanium dioxide 13g / L, 68% nitric acid 23g / L, potassium permanganate 15g / L, sodium peroxide 5g / L, ammonium bifluoride 6g / L, ferrous chloride 24g / L, chromium nitrate 5g / L, zirconium nitrate 5g / L, sodium dodecylsulfonate 14g / L, balance For water, the passivation process is:

[0024] 1) Put the aluminum alloy cylinder head into the alkaline cleaning solution for surface cleaning, the composition of the alkaline cleaning solution is 14% sodium hydroxide and 10% sodium carbonate, the temperature is 45°C, the time is 3 minutes, and then rinse with water;

[0025] 2) Put the aluminum alloy cylinder head into the pickling solution, which is composed of 16% nitric acid and 6% acetic acid; the temperature is room temperature, the time is 5 minutes, and then rinse with water;

[0026] 3) Prepare a passivat...

Embodiment 3

[0028] A kind of passivation process of aluminum alloy cylinder head, the composition of the passivation solution that described passivation process adopts is: sodium silicate 5g / L, titanium dioxide 14g / L, 68% nitric acid 21.5g / L, potassium permanganate 16g / L, sodium peroxide 4g / L, ammonium bifluoride 7g / L, ferrous chloride 23g / L, chromium nitrate 7g / L, zirconium nitrate 4g / L, sodium dodecylsulfonate 15g / L, The amount is water, and the passivation process is:

[0029] 1) Put the aluminum alloy cylinder head into the alkaline cleaning solution for surface alkaline cleaning, the composition of the alkaline cleaning solution is 13% sodium hydroxide and 11% sodium carbonate, the temperature is 40°C, the time is 4 minutes, and then rinse with water;

[0030] 2) Put the aluminum alloy cylinder head into the pickling solution, which is composed of 15% nitric acid and 7% acetic acid; the temperature is room temperature, the time is 4 minutes, and then rinse with water;

[0031] 3) Pr...

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PUM

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Abstract

The invention discloses a passivation technology of an aluminum alloy cylinder cover. A passivation liquid used by the passivation technology comprises 4-6g / L of sodium silicate, 13-15g / L of titanium dioxide, 20-23g / L of nitric acid having a concentration of 68%, 15-17g / L of potassium permanganate, 3-5g / L of sodium peroxide, 6-8g / L of ammonium bifluoride, 22-24g / L of ferrous chloride, 5-9g / L of chromium nitrate, 3-5g / L of zirconium nitrate, 14-16g / L of sodium dodecylsulfate and the balance water. The passivation technology comprises the following steps of 1, carrying out alkali washing and carrying out cleaning by clear water, 2, carrying out pickling and carrying out cleaning by clear water, 3, preparing the passivation liquid from the above components, putting the passivation liquid into a passivation tank, diluting the passivation liquid by 4-6 times, controlling a temperature of the passivation liquid in a range of 35-45 DEG C and a pH value in a range of 3-5, putting a supersonic generator at the bottom of the passivation tank, carrying out passivation for 13-17min, then carrying out cleaning by water and carrying out natural drying.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to a passivation process of an aluminum alloy cylinder head. Background technique [0002] Chromate chemical transformation (passivation) of metal surface is a traditional processing technology, which has been widely used in functional coating and decorative coating fields for nearly a century due to its excellent anti-corrosion and adhesion properties, such as aerospace , electronics, automobiles, pharmaceuticals, printing, machinery, chemicals, food processing and other manufacturing industries. [0003] In the past, the surface treatment method of aluminum and its alloys was treated with chromate conversion solution. There are many chemical conversion treatments for the hexavalent chromium compounds of aluminum and its alloys, such as the Alodine method invented by the American Chemical Pigment Company. The conversion film formed by chromate treatment has excellent cor...

Claims

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Application Information

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IPC IPC(8): C23C22/34
Inventor 潘增炎
Owner 无锡杨市表面处理科技有限公司
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