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Treatment solution for preparing molybdenum-cerium composite conversion membrane on surface of magnesium alloy, and treatment method thereof

A treatment method and technology for treating liquid, applied in the direction of metal material coating process, etc., can solve the problems affecting the corrosion resistance of the film layer, the solution stability is not good enough, the film forming speed is fast, etc., and achieve high protection performance and stable cation concentration. , the effect of improving stability

Inactive Publication Date: 2012-11-21
东莞市镁皓镁合金科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The passivation film is formed in an acidic environment, and potassium permanganate is easy to decompose in an acidic environment, which will lead to insufficient stability of the solution itself
In addition, due to the strong oxidation of the oxidizing agent, the film forming speed is fast, and the formed film layer is easy to fall off after a long time, thus affecting the corrosion resistance of the film layer.

Method used

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  • Treatment solution for preparing molybdenum-cerium composite conversion membrane on surface of magnesium alloy, and treatment method thereof
  • Treatment solution for preparing molybdenum-cerium composite conversion membrane on surface of magnesium alloy, and treatment method thereof
  • Treatment solution for preparing molybdenum-cerium composite conversion membrane on surface of magnesium alloy, and treatment method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The process for preparing a composite chemical conversion coating containing colored molybdenum and cerium on the surface of a magnesium alloy includes the following steps:

[0061] (1) Sample preparation: Wire cutting from large-size AZ91 cast magnesium alloy, cut out 30×20mm samples, punch holes in the corners of each sample, and polish the magnesium alloy surface to 1500# with SiC water sandpaper, Rinse it with distilled water and dry it, and hang it with a thin wire at the hole;

[0062] (2) Pretreatment activation: Soak the sample in an alkaline solution at 30°C for 3 minutes, then rinse it with distilled water and dry it with a hair dryer for later use. The concentration of each component in the alkaline solution is Sodium 10g / L, trisodium phosphate 35g / L, sodium silicate 13g / L, sodium carbonate 15g / L.

[0063] (3) Treatment solution preparation: prepare 200mL conversion solution, in which the various components and concentrations in the treatment solution are as...

Embodiment 2

[0070] The basic process for preparing the conversion film in this example is similar to that in Example 1. The sample preparation and pretreatment activation are exactly the same as in Example 1, the difference lies in the concentration of the treatment solution and the preparation process of the conversion film.

[0071] The concentration of the treatment solution used in this embodiment and its preparation process are as follows: Prepare 200mL conversion solution, wherein the various components and concentrations in the treatment solution are as follows: ammonium molybdate 4.5g / L, cerium ammonium nitrate 9.0g / L, citric acid 2.0 g / L, EDTA-2Na 0.1g / L. Dissolve 0.9 g of ammonium molybdate, 1.8 g of cerium ammonium nitrate, 0.4 g of citric acid, and 0.02 g of EDTA-2Na in water, adjust the pH value to 2.5, and add water until the volume of the treatment solution is 200 mL. The solution preparation process and after preparation need to be stirred with a magnetic stirrer for 3 mi...

Embodiment 3

[0074] The basic process for preparing the conversion film in this example is similar to that in Example 1. The sample preparation and pretreatment activation are exactly the same as in Example 1, except that the concentration of the treatment solution and the preparation process of the conversion film are different.

[0075] The concentration of the treatment solution used in this embodiment and its preparation process are as follows: Prepare 200mL conversion solution, wherein the various components and concentrations in the treatment solution are as follows: sodium molybdate 3.5g / L, cerium nitrate 7g / L, citric acid 1.5 g / L L, EDTA-2Na 0.1g / L. Dissolve 0.7g of sodium molybdate, 1.4g of cerium nitrate, 0.3g of citric acid, and 0.02g of EDTA-2Na in water, adjust the pH value to 2.5, and add water until the volume of the treatment solution is 200mL. The solution preparation process and after preparation need to be stirred with a magnetic stirrer for 3 minutes at a speed of 100 ...

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Abstract

The invention discloses a treatment solution for preparing a molybdenum-cerium composite conversion membrane on the surface of a magnesium alloy. The treatment solution comprises 2-15g / L of a molybdate, 4-20g / L of a rare earth salt, 0.1-2.5g / L of an organic acid, 0.1-2.0g / L of an activator, and a pH adjustment agent. The treatment solution belongs to a chromium-free conversion treatment solution, contains no toxic substances, can satisfy an environmental protection requirement, realizes the conversion treatment without heating, can form a membrane at normal temperature, and has a treatment time of 3-20min. The chemically converted membrane prepared through the method has the advantages of excellent corrosion resistance, high combination strength with a matrix, simple technology, and film formation at room temperature, and is colored, so the online determination of the membrane in production is easy.

Description

technical field [0001] The invention relates to a treatment method for preparing a chromium-free chemical conversion coating on the surface of a magnesium alloy, in particular to a treatment solution and a treatment method for preparing a composite conversion coating containing colored molybdenum and cerium on the surface of a magnesium alloy, which can obtain a certain chemical conversion coating on the surface of a magnesium alloy. The colored molybdenum-cerium composite conversion film layer with high thickness and excellent corrosion resistance is a chromium-free chemical conversion treatment method with application prospects. Background technique [0002] Magnesium is the eighth most abundant element in reserves on earth, and its content is abundant. Magnesium alloy has a series of advantages such as low density, high specific strength, good electromagnetic shielding, and recyclability. High specific strength makes it the first choice for lightweight applications in au...

Claims

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Application Information

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IPC IPC(8): C23C22/40C23C22/78
Inventor 杜军蒋辉李文芳穆松林
Owner 东莞市镁皓镁合金科技有限公司
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