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Chromium-free passivating pretreatment method for mirror aluminum board

A chrome-free passivation, mirror aluminum plate technology, applied in the direction of metal material coating process, etc., to achieve the effect of low cost, stable process and good adhesion

Inactive Publication Date: 2014-06-18
SHANGHAI REAL INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a chromium-free passivation pretreatment method for processing mirror aluminum plates before spraying, to replace the hexavalent chromium passivation pretreatment method currently used for processing mirror aluminum plates

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Preparation of degreasing solution: Weigh 30g of potassium hydroxide, 12g of potassium silicate, 7g of potassium tetraborate, 10g of fatty alcohol alkoxy ether, and 5g of composite corrosion inhibitor, and dissolve them in 1L of tap water. Heat to about 40°C and keep stirring. After the dissolution is complete, adjust the pH value to 10-12 with acetic acid, and use it after standing still at room temperature for 24 hours;

[0025] (2) Preparation of surface adjustment solution: Weigh 30g of phosphoric acid and 3g of hydrofluoric acid, dissolve in 1L of tap water, stir to mix evenly, adjust the pH value to 1.5-3 with ammonia water, and the temperature is 22°C;

[0026] (3) Preparation of chromium-free passivation solution: weigh 4g hexafluorozirconic acid, 1g hexafluorotitanic acid, 13g magnesium nitrate, 0.5g hydrofluoric acid, 0.4g sodium sulfate, 2g 3-aminopropyltriethoxysilane , 0.08g of lanthanum chloride, dissolved in 1L of deionized water, stirred to dissolve ...

Embodiment 2

[0038] (1) Preparation of degreasing solution: Weigh 24g of potassium hydroxide, 10g of potassium silicate, 8g of potassium tetraborate, 15g of fatty alcohol alkoxy ether, and 6.5g of composite corrosion inhibitor, dissolve them in 1L of tap water, and dissolve them in 1L of tap water. It needs to be heated to about 40°C and kept stirring. After the dissolution is complete, adjust the pH value to 10-12 with acetic acid, and use it after standing still at room temperature for 24 hours;

[0039] (2) Preparation of surface adjustment solution: Weigh 24g of phosphoric acid and 1.3g of hydrofluoric acid, dissolve in 1L of tap water, stir to mix evenly, adjust the pH value to 1.5-3 with ammonia water, and the temperature is 20°C;

[0040] (3) Preparation of chromium-free passivation solution: weigh 5g hexafluorozirconic acid, 0.8g hexafluorotitanic acid, 10g magnesium nitrate, 0.6g hydrofluoric acid, 0.3g sodium sulfate, 2.5g 3-aminopropyl triethoxy silane, 0.09g lanthanum chloride, d...

Embodiment 3

[0052] (1) Preparation of degreasing solution: Weigh 15g of potassium hydroxide, 8g of potassium silicate, 11g of potassium tetraborate, 12g of fatty alcohol alkoxy ether, and 7g of composite corrosion inhibitor, and dissolve them in 1L of tap water. Heat to about 40°C and keep stirring. After the dissolution is complete, adjust the pH value to 10-12 with acetic acid, and use it after standing still at room temperature for 24 hours.

[0053] (2) Preparation of surface adjustment solution: weigh 19g of phosphoric acid and 1g of hydrofluoric acid, dissolve in 1L of tap water, stir to mix evenly, adjust the pH value to 1.5-3 with ammonia water, and the temperature is 31°C;

[0054] (3) Preparation of chromium-free passivation solution: weigh 6g hexafluorozirconic acid, 0.6g hexafluorotitanic acid, 15g magnesium nitrate, 0.7g hydrofluoric acid, 0.4g sodium sulfate, 1.7g 3-aminopropyl triethoxy Dissolve silane and 0.1g lanthanum chloride in 1L deionized water, stir to dissolve all ...

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Abstract

The invention relates to a chromium-free passivating pretreatment method for a mirror aluminum board. The pretreatment method comprises the following steps: degreasing, washing with water, surface conditioning, washing with water, chromium-free passivating, and pure water washing, wherein a degreasing solution comprises the following components: 1-4wt% of potassium hydroxide, 0.5-1.6wt% of potassium metasilicate, 0.3-1.2wt% of potassium tetraborate, 0.5-2wt% of alkoxy ether fatty alcohol and 0.1-0.8wt% of compound corrosion inhibitor; a surface conditioning solution comprises the following components: 1-4% of phosphoric acid and 0.15-0.3wt% of hydrofluoric acid; a chromium-free passivating solution comprises the following components: 0.2-0.6wt% of hexafluorozirconic acid, 0.05-0.2wt% of hexafluorotitanic acid, 0.5-1.6wt% of magnesium nitrate, 0.03-0.07wt% of hydrofluoric acid, 0.02-0.05wt% of sodium sulfate, 0.1-0.3% of 3-amino propyl ethoxy silane and 0.006-0.01wt% of lanthanum rare earth compound. When the mirror aluminum board is processed by using the chromium-free passivating pretreatment method disclosed by the invention, the mirror surface does not lose light, the passivating film is colorless and transparent, and a hexavalent chromium passivation method for the mirror aluminum board at present can be replaced.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy chemical conversion coatings, in particular to a chrome-free passivation pre-treatment method for treating mirror aluminum plates before spraying. Background technique [0002] Mirror aluminum plate refers to the aluminum plate that has been processed by various methods such as rolling and grinding to make the surface of the plate show a mirror effect. The application of mirror aluminum plate is very extensive, it is widely used in lighting reflectors and lamp decoration, solar heat collection reflective materials, interior building decoration, exterior wall decoration, household appliance panels, electronic product shells, interior and exterior decoration of automobiles, signs, signs, etc. field. The aluminum materials suitable for mirror aluminum panels are mainly pure aluminum series, that is, 1 series aluminum materials. At present, the most widely circulated mirror aluminum panels in...

Claims

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Application Information

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IPC IPC(8): C23C22/34C23C22/78
CPCC23C2222/20
Inventor 徐昌盛彭玉龙陆来发王志平陈永宝
Owner SHANGHAI REAL INDAL
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