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Preparation method for aluminium alloy radiator passivation solution before lacquering

A preparation method and technology of passivation solution, applied in the direction of metal material coating process, etc., can solve the problems of poor corrosion resistance of film formation, and achieve the effect of fast passivation, saving process and improving efficiency.

Inactive Publication Date: 2015-02-04
无锡永发电镀有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conversion coating on the surface of aluminum or aluminum alloy treated in this way does not contain chromium and will not cause harm to the human body and the environment, but the corrosion resistance of the film is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A preparation method of a passivation solution before painting an aluminum alloy radiator, the passivation solution is composed of: sodium molybdate 6g / L, potassium fluoroborate 6g / L, magnesium titanate 3g / L, sodium zirconate 10g / L , water-based polyurethane 16g / L, boric acid 14g / L, acetic acid 4g / L, thiourea 2g / L, and the balance is water; the preparation method is: take various raw materials according to the above ratio, and put it into the reaction kettle , heated to 35°C, then started the stirrer at a speed of 180 rpm, stirred for 15 minutes, then cooled to room temperature, and then stood for 12 hours.

Embodiment 2

[0015] A preparation method of a passivation solution before painting an aluminum alloy radiator, the passivation solution is composed of: sodium molybdate 8g / L, potassium fluoroborate 4g / L, magnesium titanate 5g / L, sodium zirconate 8g / L , water-based polyurethane 18g / L, boric acid 12g / L, acetic acid 6g / L, thiourea 1g / L, and the balance is water; the preparation method is: take various raw materials according to the above ratio, and put it into the reactor , heated to 45°C, then started the stirrer at a speed of 160 rpm, stirred for 25 minutes, then cooled to room temperature, and then stood for 10 hours.

Embodiment 3

[0017] A method for preparing a passivation solution before painting an aluminum alloy radiator, the passivation solution is composed of: sodium molybdate 7g / L, potassium fluoroborate 5g / L, magnesium titanate 4g / L, sodium zirconate 9g / L , water-based polyurethane 17g / L, boric acid 13g / L, acetic acid 5g / L, thiourea 1.5g / L, and the balance is water; the preparation method is: take various raw materials according to the above proportioning ratio, put them into the reaction In the kettle, heat to 40°C, then start the stirrer at a speed of 170 rpm, stir for 20 minutes, then cool to room temperature, and then stand for 11 hours.

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PUM

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Abstract

The invention discloses a preparation method for an aluminium alloy radiator passivating solution before lacquering. The passivating solution comprises 6-8 g / L of sodium molybdate, 4-6 g / L of potassium tetrafluoroborate, 3-5 g / L of magnesium titanate, 8-10 g / L of sodium zirconate, 16-18 g / L of aqueous polyurethane, 12-14g / L of boric acid, 4-6 g / L of acetic acid, 1-2g / L of thiourea and the balance water. The preparation method comprises: weighing all raw materials according to the above proportions, putting in a reaction kettle, heating to 35-45 DEG C, then starting a stirrer, controlling the rotation speed to be 160-180 r / min, stirring for 15-25 min, then cooling to room temperature and putting for 10-12 h.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to a method for preparing a passivation solution before painting an aluminum alloy radiator. Background technique [0002] With the improvement of people's living standards, people are increasingly pursuing the practicality and beauty of home decoration. Among them, the exterior of the aluminum alloy radiator can be painted with various colors of paint to match other colors of home decoration, and because of the good thermal conductivity of aluminum , high heat dissipation efficiency, therefore, colorful radiators made of aluminum alloys are more and more popular. [0003] Various pretreatments are required before aluminum alloy painting, among which chemical conversion coating is the most commonly used technical means in aluminum surface treatment. The chemical conversion coating has a certain corrosion resistance and good physical adsorption capacity, which can greatly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/44
CPCC23C22/44
Inventor 石明
Owner 无锡永发电镀有限公司
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