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Nickel-free hole sealing agent for aluminum alloy anode oxide film and preparation method

An anodized film, aluminum alloy technology, applied in electrolytic coatings, surface reaction electrolytic coatings, coatings, etc., can solve the problems of high temperature required for the process, increased production costs, and inability to achieve completeness, so as to avoid human body and Environmental hazards, energy saving, improved flatness and brightness

Inactive Publication Date: 2019-03-08
JIANGSU FEITUO INTERFACE ENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] To solve Ni 2+ For the problem of exceeding the standard, people have searched for various metal ions that can be replaced. In related technologies, a low-nickel medium-temperature sealing agent is introduced, and metal salts such as zinc, copper, cerium, and magnesium are used as supplements to reduce the demand for nickel. It cannot be completely nickel-free, and the temperature required for the process is high, which increases the production cost
At present, there are also some nickel-free sealing agents, which mainly use magnesium and lithium as the main salt, combined with polysilicate zinc or nano-zinc oxide and fluorine-containing surfactants to obtain a medium-temperature sealing agent, but there are still poor stability and high working temperature. , Narrow pH range and other disadvantages

Method used

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  • Nickel-free hole sealing agent for aluminum alloy anode oxide film and preparation method

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Effect test

Embodiment 1

[0032] A nickel-free sealing agent for aluminum alloy anodic oxidation film, which is composed of the following raw materials in terms of mass percentage: 3.0% zinc-based main salt compound, 3.0% complexing agent, 3.0% sealing accelerator, 10.0% Stabilizer, 12.5% ​​gray suppressant brightener, 68.5% water.

[0033] The preparation method of the above-mentioned aluminum alloy anodized film nickel-free sealing agent is:

[0034] Weigh zinc nitrate: 30 parts, sodium gluconate: 30 parts, ammonium bifluoride: 30 parts, polyvinylpyrrolidone: 25 parts, polyethylene glycol: 100 parts, polydimethylsiloxane: 100 parts respectively by weight percentage . Water: 685 parts. Add the above-mentioned raw materials in order in all parts of the water under stirring. After one raw material is completely dissolved, add the next raw material. After adding all the raw materials, stir until the solution is clear and transparent.

Embodiment 2

[0036] A nickel-free sealing agent for aluminum alloy anodized film, which is composed of the following raw materials in terms of mass percentage: 3.0% zinc-based main salt compound, 4.0% complexing agent, 4.0% sealing accelerator, 9.0% Stabilizer, 11.0% gray suppression brightener, 69.0% water.

[0037] The preparation method of the above-mentioned aluminum alloy anodized film nickel-free sealing agent is:

[0038] Weigh respectively zinc nitrate: 30 parts, EDTA: 40 parts, potassium fluoride: 40 parts, polyvinylpyrrolidone: 20 parts, polyethylene glycol: 90 parts, polydimethylsiloxane: 90 parts, Water: 690 parts, add the above raw materials in order in all parts of the water under stirring, add the next raw material after one raw material is completely dissolved, and stir until the solution is clear and transparent.

Embodiment 3

[0040] A nickel-free sealing agent for aluminum alloy anodized film, which is composed of the following raw materials in terms of mass percentage: 6.0% zinc-based main salt compound, 3.0% complexing agent, 3.0% sealing accelerator, 4.0% Stabilizer, 5.0% gray suppression brightener, 79.0% water.

[0041] The preparation method of the above-mentioned aluminum alloy anodized film nickel-free sealing agent is:

[0042] Weigh zinc lactate: 60 parts, sodium oxalate: 30 parts, sodium thiosulfate: 30 parts, polyvinylpyrrolidone: 20 parts, Tween 80: 40 parts, polydimethylsiloxane: 30 parts by weight percentage . Water: 790 parts. Add the above-mentioned raw materials in order in all parts of the water under stirring. After one raw material is completely dissolved, add the next raw material. After adding all the raw materials, stir until the solution is clear and transparent.

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Abstract

The invention provides a nickel-free hole sealing agent for an aluminum alloy anode oxide film and a preparation method. The nickel-free hole sealing agent for the aluminum alloy anode oxide film is prepared from the following raw materials in mass percent: 3.0 to 6.0 percent of zinc series main salt compound, 2.0 to 4.0 percent of complexing agent, 2.0 to 4.0 percent of hole sealing accelerant, 4.0 to 10.0 percent of stabilizer, 5.0 to 15.0 percent of anti-gray brightener and the balance water. The hole sealing agent provided by the invention is low in working temperature and wide in pH (potential of hydrogen) range, and has a good hole sealing effect under the conditions that concentration is 2 to 6 percent, pH is 3 to 6 and temperature is 15 to 35 DEG C; the hole sealing agent is environmentally friendly and is free of nickel, so that the harm to the human body and the environment is avoided; the working temperature is low, energy resources are saved, and the process is stable; andthe hole sealing performance of a hole sealing groove can be kept only by supplementing the hole sealing agent periodically.

Description

technical field [0001] The invention relates to the technical field of anodic oxidation post-treatment of aluminum alloys, in particular to a nickel-free sealing agent for aluminum alloy anodized film and a preparation method thereof. Background technique [0002] Anodizing is the most widely used surface treatment technology for aluminum and aluminum alloys. It can significantly improve the performance of aluminum and its alloys, improve the surface hardness and wear resistance of aluminum and its alloys. Due to the large number of micropores on the surface of the oxide film, It must be sealed. The common sealing methods mainly include boiling water (or steam) sealing, nickel salt sealing, and polymer resin sealing. Commonly used nickel salt sealing agents with high sealing quality contain Ni 2+ Toxic to human body and environment. [0003] To solve Ni 2+ For the problem of exceeding the standard, people have searched for various metal ions that can be replaced. In relat...

Claims

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Application Information

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IPC IPC(8): C25D11/24
CPCC25D11/246
Inventor 姜鹤旻郑建王振兴
Owner JIANGSU FEITUO INTERFACE ENG TECH CO LTD
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