Technology for passivation of surface of aluminum alloy for radiator

A technology of aluminum alloy surface and heat sink, which is applied in the direction of metal material coating process, etc., can solve the problems of environmental pollution and other problems, and achieve the effect of stable process, low cost and uniform color

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

The composition of the chromium-free chemical conversion solution of this invention is silicate, titanium salt, peroxide, fluoride, sulfuric acid, although it does not contain hexavalent chromium ion and potassium ferricyanide, it still has a large amount of fluorine ion, which is still harmful to the environment. Pollution exists

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A kind of aluminum alloy surface passivation process for radiator, the composition of the passivation liquid that this process adopts is: nitric acid 6g / L, ammoniacal liquor 6g / L, boric acid 3g / L, potassium permanganate 14g / L, titanium sulfate 6g / L , zirconium nitrate 9g / L, triethanolamine 2g / L, sodium dodecylbenzene sulfonate 14g / L, surplus is water; Described passivation process is:

[0018] 1) The aluminum alloy surface of the radiator is pickled and decontaminated with pickling solution, and then cleaned with water;

[0019] 2) Dilute the passivation solution with the above composition according to the ratio of 1:6, then put it into the passivation tank, adjust the pH value to 4.5, and make the temperature 35°C, and place the aluminum alloy for the radiator in the passivation tank Carry out passivation treatment, the treatment time is 11 minutes;

[0020] 3) Washing the passivated radiator with aluminum alloy, drying and cooling.

Embodiment 2

[0022] A kind of aluminum alloy surface passivation process for radiator, the composition of the passivation liquid that this process adopts is: nitric acid 8g / L, ammoniacal liquor 4g / L, boric acid 5g / L, potassium permanganate 12g / L, titanium sulfate 8g / L , zirconium nitrate 7g / L, triethanolamine 4g / L, sodium dodecylbenzene sulfonate 13g / L, surplus is water; Described passivation process is:

[0023] 1) The aluminum alloy surface of the radiator is pickled and decontaminated with pickling solution, and then cleaned with water;

[0024] 2) Dilute the passivation solution with the above composition according to the ratio of 1:8, then put it into the passivation tank, adjust the pH value to 3.5, and make the temperature 45°C, and place the aluminum alloy for the radiator in the passivation tank Carry out passivation treatment, the treatment time is 9 minutes;

[0025] 3) Washing the passivated radiator with aluminum alloy, drying and cooling.

Embodiment 3

[0027] A kind of aluminum alloy surface passivation process for radiator, the composition of the passivation liquid that this process adopts is: nitric acid 7g / L, ammoniacal liquor 5g / L, boric acid 4g / L, potassium permanganate 13g / L, titanium sulfate 7g / L , zirconium nitrate 8g / L, triethanolamine 3g / L, sodium dodecylbenzene sulfonate 13.5g / L, surplus is water; Described passivation process is:

[0028] 1) The aluminum alloy surface of the radiator is pickled and decontaminated with pickling solution, and then cleaned with water;

[0029] 2) Dilute the passivation solution with the above composition according to the ratio of 1:7.5, then put it into the passivation tank, adjust the pH value to 4.0, and make the temperature 40°C, and place the aluminum alloy for the radiator in the passivation tank Carry out passivation treatment, the treatment time is 10 minutes;

[0030] 3) Washing the passivated radiator with aluminum alloy, drying and cooling.

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PUM

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Abstract

The invention discloses a technology for passivation of a surface of an aluminum alloy for a radiator. A passivation liquid used by the technology comprises 6-8g / L of nitric acid, 4-6g / L of ammonia water, 3-5g / L of boric acid, 12-14g / L of potassium permanganate, 6-8g / L of titanium sulfate, 7-9g / L of zirconium nitrate, 2-4g / L of triethanolamine, 13-14g / L of sodium dodecylbenzenesulfonate and the balance water. The technology comprises the following steps of 1, carrying out pickling on the surface of an aluminum alloy for a radiator by a pickling liquid to remove dirt and carrying out cleaning by clear water, 2, diluting the passivation liquid containing the above components according to a ratio of 1: 6-8, putting the passivation liquid into a passivation tank, adjusting a pH value to 3.5-4.5 and a temperature to 35-45 DEG C, putting the aluminum alloy for the radiator into the passivation tank, and carrying out passivation treatment for 9-11min, and 3, carrying out water washing on the passivated aluminum alloy for the radiator, carrying out drying and carrying out cooling.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to an aluminum alloy surface passivation process for radiators. Background technique [0002] Aluminum is a non-ferrous metal that is second only to steel in terms of output and consumption in the world. With the continuous development of modern science and technology and the continuous emergence of new industrial fields, the use of aluminum is becoming more and more extensive, the demand is increasing day by day, and it is playing an increasingly important role in the national economy. [0003] Aluminum alloy has the characteristics of light weight, high specific strength, high thermal conductivity, and good heat dissipation. As a light structural material, aluminum alloy is light in weight and high in strength. Various vehicles, especially aircraft, missiles, rockets, artificial earth satellites, etc., use a large amount of aluminum, and a supersonic aircraft uses alumi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/56
Inventor 潘增炎
Owner 无锡杨市表面处理科技有限公司
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