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Non-chromium deactivation liquid for processing aluminium alloy and method of use thereof

A chromium-free passivation, aluminum alloy technology, applied in the direction of metal material coating process, etc., can solve problems such as increasing processing steps, and achieve the effects of reducing environmental pollution, low price, and simple and easy processing methods

Inactive Publication Date: 2008-04-16
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chemetall’s other patent, US 6488990 B1, seals the titanium-zirconium film with organic phosphoric acid, which greatly improves the adhesion between the aluminum alloy and the polymer coating, but uses two separate steps to increase the processing steps

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Passivation solution configuration:

[0028] Commercially available fluotitanic acid (40wt%), fluozirconic acid (45wt%) and aminotrimethylene phosphonic acid (50wt%) were selected to prepare a passivation solution. Weigh 5.6 grams of fluotitanic acid, 1.2 grams of fluozirconic acid, and 0.4 grams of aminotrimethylene phosphonic acid, dissolve them in 1 liter of distilled water or deionized water, adjust the pH value to 3 to 3.5 with ammonia water, and use it after natural reaction at room temperature for 1 day . This passivation solution contains Ti 4+ Concentration is 0.065wt%, Zr 4+ The concentration is 0.024 wt%, and the concentration of aminotrimethylene phosphonic acid is 0.02 wt%.

[0029] Approach:

[0030] (1) AA6061 aluminum alloy is degreased with acetone, rinsed with tap water;

[0031] (2) alkali washing is to process 5 minutes at 25 ℃ with 2wt% sodium hydroxide solution, rinse clean with tap water;

[0032] (3) In acidic liquid, containing 1wt% sulfur...

Embodiment 2

[0037] Passivation solution configuration:

[0038] Commercially available fluotitanic acid (40wt%), fluozirconic acid (45wt%) and aminotrimethylene phosphonic acid (50wt%) were selected to prepare a passivation solution. Weigh 8.56 g of fluotitanic acid, 2.52 g of fluozirconic acid, and 1 g of aminotrimethylene phosphonic acid, dissolve them in 1 liter of distilled water or deionized water, adjust the pH value to 3 to 3.5 with ammonia water, and use it after natural reaction at room temperature for 1 day . This passivation solution contains Ti 4+ The concentration is 0.1wt%, Zr 4+ The concentration is 0.05 wt%, and the concentration of aminotrimethylene phosphonic acid is 0.1 wt%.

[0039] Its processing method is the same as Example 1, and the difference is that alkali washing adopts 2wt% sodium salt compound solution (7wt% sodium carbonate, 40wt% sodium pyrophosphate, 23wt% sodium sulfate, 15wt% sodium dodecylsulfonate, 13wt% % sodium silicate, 2wt% dodecylphenol ethoxy...

Embodiment 3

[0042] Passivation solution configuration:

[0043]Commercially available fluorotitanic acid (40wt%), fluorozirconic acid (45wt%) and 2-phosphonobutane-1,2,4-tricarboxylic acid (50wt%) were selected to prepare a passivation solution. Weigh 11.2 grams of fluorotitanic acid, 2.4 grams of fluorozirconic acid, and 0.8 grams of 2-phosphonobutane-1,2,4-tricarboxylic acid, dissolve them in 1 liter of distilled or deionized water, and adjust the pH value with ammonia water 3~3.5, use after natural reaction at room temperature for 1 day. This passivation solution contains Ti 4+ Concentration is 0.13%, Zr 4+ The concentration was 0.048%, and the concentration of 2-phosphonobutane-1,2,4-tricarboxylic acid was 0.04%.

[0044] Other treatment methods are the same as in Example 1, except that the alkali cleaning is performed at 40° C. for 3 minutes; the prepared passivation solution is immersed in the aluminum alloy at 40° C. for 3 minutes, and dried at 130° C. for 20 minutes.

[0045] ...

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Abstract

The present invention relates to a chrome-free passivating liquid for treating aluminum alloy and a method for using the same; the components of the passivating liquid and the weight concentration of the elements thereof consist of fluorin titanate comprising Ti (IV) between 0.05 wt percent and 0.15 wt percent, fluorin zirconate comprising Zr (IV) 0.01 wt percent and 0.05 wt percent and organic phosphate compound comprising 0.02 wt percent to saturated concentration. The use method of the passivating liquid of the invention has the following procedures: after grease on the surface of the aluminum alloy is removed, the aluminum alloy is treated by alkali cleaning, deoxidation and activation; when the temperature is between 25 DEG C and 60 DEG C and the PH value is between 3 and 3.5, the aluminum alloy is treated by impregnating or spraying for 2 min to 5 min. In the passivating liquid of the invention, organic phosphoric acid is directly added to a titanium zirconium system; the formed zirconium phosphate composite structure can obviously improve the corrosion resisting property of a passivating film and the adhesive capactiy of polymer coating (primer) on the surface of aluminum alloy.

Description

technical field [0001] The invention relates to a chromium-free passivation solution for processing aluminum alloys and a use method thereof, in particular to a chromium-free passivation solution containing organic phosphoric acid and titanium and zirconium and a use method thereof. Background technique [0002] Traditionally, the protective treatment of aluminum alloy surface is mainly chromate passivation. Due to the high toxicity of chromate, it pollutes the environment and is easy to cause cancer. With the increasing awareness of environmental protection, WEES and ROHS directives strictly restrict the use of chromate. [0003] In recent years, the chromium-free passivation solutions with good application prospects and good effects are mainly trivalent chromium, molybdate, rare earth cerium salt, zirconium-titanium system and organosilane system. [0004] The toxicity of trivalent chromium is only about 1wt% of hexavalent chromium, and the passivation solution is mainly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/06C23C22/78C23C22/82
Inventor 刘常升王双红陈岁元
Owner NORTHEASTERN UNIV
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