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Magnesium alloy micro-arc oxidation electrolyte and preparation method thereof and magnesium alloy surface treatment method

A technology of micro-arc oxidation and magnesium alloy, applied in the direction of microsphere preparation, anodic oxidation, electrolytic coating, etc., can solve the problems of easy damage, local corrosion, coating corrosion, etc., and achieve good corrosion resistance and small roughness , the effect of uniform micropore distribution

Active Publication Date: 2019-09-17
JIAXING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional micro-arc oxidation coating is easily damaged during use, causing corrosion of the coating in the damaged area, and then localized corrosion that is more harmful than uniform corrosion, which limits the application of micro-arc oxidation technology

Method used

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preparation example Construction

[0067] A preparation method of the magnesium alloy micro-arc oxidation electrolyte, comprising the following steps:

[0068] Sodium hydroxide, sodium silicate, sodium carbonate, anionic surfactant, microcapsules and water are mixed.

[0069] The preparation method of the magnesium alloy micro-arc oxidation electrolyte provided by the present invention mixes electrolyte components, anionic surfactants, microcapsules and water to obtain the electrolyte, which has the advantages of convenience, simplicity, and ease of production.

[0070] In some preferred embodiments of the present invention, the preparation method of the microcapsules specifically includes the following steps:

[0071] (a), slowly drop the mixed aqueous solution of soluble magnesium salt and soluble aluminum salt into the aqueous solution of soluble molybdate, control reaction system pH=9-10 during the dropping process, carry out constant temperature reflux reaction under non-oxidizing atmosphere, After the re...

Embodiment 1

[0103] Magnesium alloy material: AZ31 magnesium alloy plate

[0104] The magnesium alloy material is made into a sample and undergoes the following pretreatments: grinding, distilled water cleaning, acetone ultrasonic cleaning, distilled water cleaning, and drying.

[0105] Electrolyte composition:

[0106] NaOH: 50g / L,

[0107] Na 2 SiO 3 : 10g / L,

[0108] Na 2 CO 3 : 15g / L,

[0109] Sodium lauryl sulfate: 2.5g / L

[0110] Microcapsules: 8g / L.

[0111] The preparation steps of described microcapsules are as follows:

[0112] (1) Preparation of corrosion-inhibiting anion intercalation hydrotalcite: 0.54mol / L Mg(NO 3 ) 2 and 0.18mol / L Al(NO 3 ) 3 400mL of mixed salt solution was added dropwise to 200mL of 0.625mol / L Na 2 MoO 4 In the aqueous solution, add ammonia water to control the pH value of the reaction to always be 9-10. 2 Under the protection of constant temperature reflux reaction for 10h, the reaction temperature is 80°C, then aged at room temperature fo...

Embodiment 2

[0129] Magnesium alloy material: AZ31 magnesium alloy plate

[0130] The magnesium alloy material is made into a sample and undergoes the following pretreatments: grinding, distilled water cleaning, acetone ultrasonic cleaning, distilled water cleaning, and drying.

[0131] Electrolyte composition:

[0132] NaOH: 20g / L,

[0133] Na 2 SiO 3 : 25g / L,

[0134] Na 2 CO 3 : 20g / L,

[0135] Sodium lauryl sulfate: 1g / L,

[0136] Microcapsules: 2g / L.

[0137] The preparation steps of described microcapsules are as follows:

[0138] (1) Preparation of corrosion-inhibiting anion intercalation hydrotalcite: 0.54mol / L Mg(NO 3 ) 2 and 0.18mol / L Al(NO 3 ) 3 400mL of mixed salt solution was added dropwise to 200mL of 0.625mol / L Na 2 MoO 4 In the aqueous solution, add ammonia water to control the pH value of the reaction to always be 9-10. 2 Under the protection of constant temperature reflux reaction for 10h, the reaction temperature is 80°C, then aged at room temperature for...

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Abstract

The invention provides magnesium alloy micro-arc oxidation electrolyte and a preparation method thereof and a magnesium alloy surface treatment method. The magnesium alloy micro-arc oxidation electrolyte comprises the following components by mass concentration: 15-70 g / L of sodium hydroxide, 5-40 g / L of sodium silicate, 5-25 g / L of sodium carbonate, 0.5-3 g / L of anionic surfactants, and 1-10 g / L of microcapsules; and the microcapsules comprise corrosion-inhibition anionic insertion layer hydrotalcite capsule cores, and capsule walls coated on the capsule cores. The magnesium alloy micro-arc oxidation electrolyte is additionally provided with a proper amount of the microcapsules with corrosion-inhibition anionic insertion layer hydrotalcite as the capsule cores; after coating layers are broken, corrosion-inhibition anions are fed in solution to exchange with Cl-; the hydrotalcite achieves an effect of covering wound surfaces of the broken coating layers; and dual effects of corrosion inhibition and self-repair of the coating layers are achieved.

Description

technical field [0001] The invention relates to the technical field of magnesium alloy surface treatment, in particular to a magnesium alloy micro-arc oxidation electrolyte, a preparation method thereof, and a magnesium alloy surface treatment method. Background technique [0002] Magnesium and its alloys have many excellent properties, such as low density, high specific strength, good shock absorption, electromagnetic shielding and radiation resistance. These characteristics make it an ideal structural material in the fields of aviation, automobiles, electronics, and 3C, and has become a hot spot in the research and use of new materials around the world. However, the corrosion resistance of magnesium alloys is the lowest among commonly used metal structural materials, and they are prone to galvanic corrosion, which has become a key problem limiting the application of magnesium alloys. Magnesium alloys are extremely easy to corrode because the nature of magnesium alloys is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30C08G12/32B01J13/06
CPCB01J13/06C08G12/32C25D11/026C25D11/30
Inventor 屠晓华李加友缪程平张洋徐雅玲于建兴
Owner JIAXING UNIV
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