Treatment liquid and treatment method for preparing zirconium-based colored conversion film on magnesium alloy surface

A treatment method, magnesium alloy technology, applied in the direction of metal material coating process, etc., can solve the problems of long film forming time, colorless film layer, inconvenient on-site observation and judgment, etc., achieve good gloss, smooth surface, easy to observe and The effect of the operation

Inactive Publication Date: 2014-01-08
东莞市镁皓镁合金科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these patented technologies have certain practical prospects, they all have some shortcomings, mainly as follows: 1) The film layer is colorless, which is inconvenient for on-site observation and judgment; 2) Phosphorus is contained in the film-forming solution and the film layer, which will lead to eutrophication , which does not meet the requirements of green environmental protection; 3) The film formation time is longer, which reduces the production efficiency

Method used

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  • Treatment liquid and treatment method for preparing zirconium-based colored conversion film on magnesium alloy surface
  • Treatment liquid and treatment method for preparing zirconium-based colored conversion film on magnesium alloy surface
  • Treatment liquid and treatment method for preparing zirconium-based colored conversion film on magnesium alloy surface

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Embodiment 1

[0071] In this embodiment, the AZ91D magnesium alloy material is used as the substrate, and the treatment method for preparing a zirconium-based colored conversion film on the surface of the magnesium alloy includes the following steps:

[0072] (1) Pre-treatment the surface of the magnesium alloy: grind the magnesium alloy to 1200# with SiC sandpaper, and then carry out the above-mentioned alkaline solution degreasing treatment: soak the magnesium alloy in an alkaline solution at 25°C for 30 minutes, and each liter of alkali The neutral solution contains 50g sodium hydroxide, 20g anhydrous sodium carbonate and 40g sodium silicate.

[0073] (2) Place the magnesium alloy treated in step (1) in the treatment solution, and soak it at 35°C for 3 minutes to prepare a colored zirconium-based conversion film on the surface of the magnesium alloy;

[0074] The composition of the treatment solution is as follows: every liter of the treatment solution contains 1.5g of zirconium-containi...

Embodiment 2

[0080] In this embodiment, the AZ91D magnesium alloy material is used as the substrate, and the treatment method for preparing a zirconium-based colored conversion film on the surface of the magnesium alloy includes the following steps:

[0081] (1) Pre-treatment the surface of the magnesium alloy: grind the magnesium alloy to 1200# with SiC sandpaper, and then carry out the degreasing treatment of the above-mentioned alkaline solution: soak the magnesium alloy in the alkaline solution at 35°C for 10 minutes, each liter of alkali The neutral solution contains 80g sodium hydroxide, 10g anhydrous sodium carbonate and 20g sodium silicate.

[0082] (2) Place the magnesium alloy treated in step (1) in the treatment solution, and soak it at 35°C for 5 minutes to prepare a colored zirconium-based conversion film on the surface of the magnesium alloy;

[0083] The composition of the treatment solution is as follows: every liter of the treatment solution contains 1.5g of zirconium-cont...

Embodiment 3

[0086] In this embodiment, the AZ91D magnesium alloy material is used as the substrate, and the treatment method for preparing a zirconium-based colored conversion film on the surface of the magnesium alloy includes the following steps:

[0087] (1) Pre-treatment the surface of the magnesium alloy: grind the magnesium alloy to 1200# with SiC sandpaper, and then carry out the above-mentioned alkaline solution degreasing treatment: soak the magnesium alloy in an alkaline solution at 30°C for 20 minutes, and each liter of alkali The neutral solution contains 20g sodium hydroxide, 30g anhydrous sodium carbonate and 60g sodium silicate.

[0088] (2) Place the magnesium alloy treated in step (1) in the treatment solution, and soak it at 30°C for 1 min to prepare a colored zirconium-based conversion film on the surface of the magnesium alloy;

[0089] The composition of the treatment solution is as follows: every liter of the treatment solution contains 0.5g of zirconium-containing m...

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Abstract

The invention discloses treatment liquid for preparing a zirconium-based colored conversion film on a magnesium alloy surface, wherein each liter of treatment liquid contains 0.2-2.5 g of zirconium-containing main film forming agent, 0.2-1.5 g of zirconium-containing film forming oxidant, 0.5-1.5 g of film forming aid, 0.5-3.0 g of complexation colorant, 0.5-2.0 g of solution pH buffer agent and 0.01-0.05 g of solution pH regulator; the zirconium-containing main film forming agent is composed of fluorozirconic acid and fluorozirconate, which are mixed in any proportion; the zirconium-containing film forming oxidant is zirconium oxychloride; the film forming aid is any one of fluorotitanic acid, potassium fluotitanate, ammonium fluorotitanate or sodium fluorotitanate; the complexation colorant is tannic acid or citric acid. The invention further discloses a treatment method for preparing zirconium-based colored conversion film on the magnesium alloy surface by utilizing the treatment liquid. The conversion film generated by using the treatment liquid and the treatment method disclosed by the invention is good in corrosion resistance, colored, high in film forming speed and environmental-friendly.

Description

technical field [0001] The invention relates to a chemical chromium-free treatment method on the surface of a magnesium alloy, in particular to a treatment solution and a treatment method for preparing a zirconium-based colored conversion film on the surface of a magnesium alloy. Background technique [0002] Magnesium alloy has a series of advantages such as low density, high specific strength, good electromagnetic shielding, and recyclability, and is known as "green engineering material in the 21st century". However, the corrosion resistance of magnesium alloys is poor, which greatly limits the development and application of magnesium alloys. Therefore, in order to make magnesium alloys develop smoothly and rapidly, the corrosion problem must be solved first in the research of magnesium alloys. [0003] Chemical conversion treatment is currently the most commonly used surface anti-corrosion treatment process for magnesium alloys, and is widely used in corrosion protection...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/34
Inventor 杜军王建李文芳穆松林
Owner 东莞市镁皓镁合金科技有限公司
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