Magnesium alloy micro-arc oxidation method and micro-arc oxidation electrolyte

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

Pending Publication Date: 2022-05-27
JIAXING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the micro-arc oxidation coating is easily damaged during use, which will cause corrosion of the coating in the damaged area, and then localized corrosion that is more harmful than uniform corrosion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Magnesium alloy material: AZ31 magnesium alloy sheet

[0050] The magnesium alloy materials were made into samples through the following pretreatments: grinding, cleaning with distilled water, ultrasonic cleaning with acetone, cleaning with distilled water, and drying.

[0051] Electrolyte composition:

[0052] NaOH: 20g / L,

[0053] Na 2 SiO 3 : 35g / L,

[0054] Na 2 B 4 O 7 : 25g / L,

[0055] Sodium tartrate: 3g / L,

[0056] OP-10: 1g / L,

[0057] Microcapsules: 10g / L.

[0058] The preparation steps of microcapsules are as follows:

[0059] (1) Surface modification of halloysite nanotubes: 10 g of halloysite nanotubes were placed in a reaction vessel, and 90 mL of 3mol / L sodium hydroxide solution was added. Subsequently, it was sonicated at 40°C for 2 hours, washed with distilled water until neutral, centrifuged and dried.

[0060] (2) Loading of corrosion inhibitor: take 6 g of the modified halloysite nanotubes obtained in step (1) and place it in a reaction ...

Embodiment 2

[0077] Magnesium alloy material: AZ31 magnesium alloy sheet

[0078] The magnesium alloy materials were made into samples through the following pretreatments: grinding, cleaning with distilled water, ultrasonic cleaning with acetone, cleaning with distilled water, and drying.

[0079] Electrolyte composition:

[0080] NaOH: 70g / L,

[0081] Na 2 SiO 3 : 15g / L,

[0082] Na 2 B 4 O 7 : 10g / L,

[0083] Sodium tartrate: 8g / L,

[0084] OP-10: 0.5g / L,

[0085] Microcapsules: 2g / L.

[0086] The preparation of microcapsules adopts the layer-by-layer self-assembly method, and the steps are as follows:

[0087] (1) Surface modification of halloysite nanotubes: 10 g of halloysite nanotubes were placed in a reaction vessel, and 70 mL of 5mol / L sodium hydroxide solution was added. Subsequently, it was sonicated at 30 °C for 0.5 h, washed with distilled water until neutral, centrifuged and dried.

[0088] (2) Loading of the corrosion inhibitor: take 6g of the modified halloysite...

Embodiment 3

[0105] Magnesium alloy material: AZ31 magnesium alloy sheet

[0106] The magnesium alloy materials were made into samples through the following pretreatments: grinding, cleaning with distilled water, ultrasonic cleaning with acetone, cleaning with distilled water, and drying.

[0107] Electrolyte composition:

[0108] NaOH: 50g / L,

[0109] Na 2 SiO 3 : 20g / L,

[0110] Na 2 B 4 O 7 : 40g / L,

[0111] Sodium tartrate: 6g / L,

[0112] OP-10: 2g / L,

[0113] Microcapsules: 6g / L.

[0114] The preparation of microcapsules adopts the layer-by-layer self-assembly method, and the steps are as follows:

[0115] (1) Surface modification of halloysite nanotubes: 10 g of halloysite nanotubes were placed in a reaction vessel, and 45 mL of 1 mol / L sodium hydroxide solution was added. Subsequently, it was sonicated at 50°C for 2 hours, washed with distilled water until neutral, centrifuged and dried.

[0116] (2) Loading of corrosion inhibitor: take 6g of modified halloysite nanotub...

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Abstract

The invention discloses a magnesium alloy micro-arc oxidation method and a micro-arc oxidation electrolyte. The micro-arc oxidation electrolyte comprises 15-75 g/L of sodium hydroxide, 5-40 g/L of sodium metasilicate, 10-45 g/L of sodium tetraborate, 3-8 g/L of sodium tartrate, 0.5-2 g/L of a nonionic surfactant and 1-10 g/L of microcapsules. The microcapsule is a layer-by-layer self-assembled microcapsule, and the corrosion inhibitor in the microcapsule is a mixture of 2-mercaptobenzothiazole and 8-hydroxyquinoline. The magnesium alloy is pretreated and then serves as an anode to be placed in magnesium alloy micro-arc oxidation electrolyte, stainless steel serves as a cathode, constant-current micro-arc oxidation is conducted, and the micro-arc oxidation coating is formed on the surface of the magnesium alloy. The micro-arc oxidation coating contains the layer-by-layer self-assembly microcapsules, and the self-repairing problem of local damage of the micro-arc oxidation coating can be further solved.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy surface treatment, and particularly relates to a magnesium alloy micro-arc oxidation method and a micro-arc oxidation electrolyte. Background technique [0002] Magnesium alloys have long been regarded as the material of choice for many industrial applications due to their low density, high strength-to-weight ratio, good electrical shielding, excellent damping capacity, and good thermophysical properties. However, the low corrosion resistance severely limits the further application of magnesium alloys. One of the effective ways to improve the corrosion resistance of magnesium alloys is to provide a corrosion-resistant surface layer on the surface of the magnesium substrate as a corrosion barrier to effectively protect the substrate. To date, a large amount of research work has been carried out, focusing mainly on the corrosion behavior of magnesium alloys and measures to enhance the corro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/02C25D11/06C25D11/30
CPCC25D11/02C25D11/06C25D11/30
Inventor 胡明悦屠晓华李加友缪程平张洋于建兴潘苏付睿
Owner JIAXING UNIV
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