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A kind of passivator and aluminum alloy pretreatment process

A passivation agent, aluminum alloy technology, applied in electrolytic coatings, surface reaction electrolytic coatings, coatings, etc. Increase fluorine pollution and other problems, to achieve the effect of shortening processing time, using less grooves, and reducing energy consumption

Inactive Publication Date: 2017-06-16
南通市滨海装饰材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The pre-treatment process of aluminum alloy spraying is divided into two categories: traditional chromization and zirconium-titanium chromium-free treatment. The traditional chromization treatment has continued to this day, and most companies are still using it. Due to the use of toxic and harmful, the country banned the first and second Hazardous chemicals, such as hydrofluoric acid and chromic acid (hexavalent), have been included in the ranks of banned processes; modern titanium-zirconium-free chromium treatment is being widely promoted, although titanium-zirconium-free chromium treatment can solve chromium pollution Environmental problems, but this kind of processing technology uses titanium zirconium fluoride, one is to increase the new pollution of fluorine, and the other is that the pretreatment medium (passivation film) film layer is ultra-thin, soft, poor wear resistance, and is easy to be damaged. Bumps, scratches, scratches, in the actual production process, the surface of the damaged medium (passive film) is easily polluted and corroded by the surrounding environment, and it is difficult to be found after the film layer is polluted or corroded, and there is often It may cause a large area of ​​powder coating to fall off, and because the color of the chromium-free treatment medium is colorless and transparent, the product quality monitoring cannot be fully inspected in the mass production process, and it can only be guaranteed by the process. found that it will lead to major quality accidents

Method used

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  • A kind of passivator and aluminum alloy pretreatment process
  • A kind of passivator and aluminum alloy pretreatment process
  • A kind of passivator and aluminum alloy pretreatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 Preparation of passivating agent

[0030] The passivation agent is prepared by injecting the required components into the reaction kettle in proportions and then stirring. In this example, the passivation agent required for preparation is prepared according to the weight percentage of each component in Table 1 plus water.

[0031] Table 1 The content of each component in the passivator

[0032]

[0033]

Embodiment 2

[0034] In Example 2, the same steps were performed with formula A, a, F, f, K, k, P, and p respectively

[0035] The aluminum profile enters the 1# tank, washes up and down for 2 minutes at room temperature, and hangs out dripping for 1.0min; enters the 2# tank, after the power is turned on, the temperature rises and stabilizes to 36℃~38℃, the passivation agent content 58g / L (1 liter of water The passivation agent content is 58 grams), DC voltage is set to 15V, current density is set to 0.15A / dm 2 , Time 4min, hanging out dripping 1.0min; entering 3# tank, room temperature, washing up and down for 2min, hanging out dripping 1.0min; entering 4# tank, room temperature, washing up and down for 2min, hanging out dripping 1.0min; into drying Furnace, the temperature is set at 60℃, and the oven is baked for 20 minutes;

[0036] The thickness of the gel-like passivation film formed on the pre-treatment surface is 0.3-0.4 microns, and the product quality is stable. The aluminum profile tre...

Embodiment 3

[0037] In Example 3, the same steps were performed with formula B, b, G, g, L, 1, Q, and q respectively

[0038] The aluminum profile enters the 1# tank, washes at room temperature for 2 minutes up and down, and hangs out dripping for 0.5min; enters the 2# tank, after electrifying, the temperature is stable at 8℃~10℃, the passivating agent content is 60g / L, and the DC voltage is set to 18V , Current density setting 0.13A / dm 2 , Time 6min, hanging out dripping 0.5min; entering 3# tank, room temperature, washing up and down for 2min, hanging out dripping 1.0min; entering 4# tank, room temperature, washing up and down for 2min, hanging out dripping 1.0min; into drying Furnace, set the temperature to 80℃, and bake for 25min.

[0039] The thickness of the gel-like passivation film formed on the surface of the aluminum profile is 0.3-0.4 microns, and the product quality is stable. The aluminum profile treated in this way can be used for further spraying flat powder. After spraying treatm...

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PUM

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Abstract

The invention provides a passivator and an aluminum alloy pre-treatment technology. The passivator consists of the following ingredients: 9-20% of citric acid or malic acid, 3-5% of boric acid, 3-5% of tartaric acid, 0-5% of sulfuric acid, 3-5% of glyconic acid, 0.19-0.59% of a surfactant and the balance of water. The aluminum alloy pre-treatment technology comprises the steps of water washing, electrolysis passivating, water washing, water washing and drying. A complex gelatinous passivating film layer is formed on the surface of an aluminum matrix by the aluminum alloy pre-treatment technology through electrolytic oxidation reaction.

Description

Technical field [0001] The invention belongs to the technical field of aluminum alloy surface treatment, and specifically relates to a passivation agent and an aluminum alloy pretreatment process. [0002] technical background [0003] The pretreatment process of aluminum alloy spraying is divided into two categories: traditional chromization and zirconium-titanium chromium-free treatment. The traditional chromization treatment has continued to this day, and most companies are still using it. Because the use is toxic and harmful, the state bans one and two Class of hazardous chemicals, such as: hydrofluoric acid and chromic acid (hexavalent), have been included in the ranks of prohibited processes; modern titanium and zirconium chromium-free treatment has been widely promoted, although titanium-zirconium chromium-free treatment can solve chromium pollution Environmental problems, but the use of titanium-zirconium fluoride in this processing technology increases the new pollution ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/00
Inventor 李政邓维鹏
Owner 南通市滨海装饰材料有限公司
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