Highly corrosion-resistant ceramic coating solution prepared through magnesium alloy surface micro-arc oxidation and application thereof

A technology of micro-arc oxidation and ceramic coating, which is applied in anodic oxidation and other directions, can solve the problems of large melting pits on the surface of magnesium alloys and rough ceramic coatings, and achieve the effects of uniform thickness, simple composition and low surface roughness

Active Publication Date: 2011-03-30
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ceramic coatings prepared by these processes are relatively rough, and even re

Method used

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  • Highly corrosion-resistant ceramic coating solution prepared through magnesium alloy surface micro-arc oxidation and application thereof
  • Highly corrosion-resistant ceramic coating solution prepared through magnesium alloy surface micro-arc oxidation and application thereof
  • Highly corrosion-resistant ceramic coating solution prepared through magnesium alloy surface micro-arc oxidation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The composition of the high corrosion resistance ceramic coating solution prepared by micro-arc oxidation on the surface of magnesium alloy is as follows:

[0036] 12 g / L Potassium Fluozirconate, 10 g / L Ammonium Dihydrogen Phosphate, 2 g / L Potassium Fluoride, 10 g / L Sodium Citrate and the balance of water; the sample is AM60 die-cast magnesium alloy. The micro-arc oxidation power supply adopts a constant voltage pulse power supply, and the parameters are 400V voltage, 100Hz frequency, and 60% duty cycle. The method for preparing a single-layer ceramic coating is:

[0037] 1) Mechanical pretreatment and degreasing treatment;

[0038] Among the present invention, described mechanical pretreatment refers to that sample is ground with sandblasting or sandpaper, removes burr, surface oxide etc.; 1. Wash with 15 g / L sodium carbonate compound aqueous solution to remove general dirt, sintered lubricant, cutting agent, etc., the temperature is controlled at 70 ° C, and the tim...

Embodiment 2

[0046] The composition of the high corrosion resistance ceramic coating solution prepared by micro-arc oxidation on the surface of magnesium alloy is as follows:

[0047] 6 g / L sodium fluozirconate, 8 g / L sodium dihydrogen phosphate, 8 g / L ammonium fluoride, 2 g / L potassium citrate and the balance of water; the sample is AZ31 extruded magnesium alloy. The micro-arc oxidation power supply adopts a constant voltage pulse power supply, and the parameters are 350V voltage, 500Hz frequency, and 20% duty cycle. Its preparation method is identical with embodiment 1.

[0048] In this example, the thickness of the ceramic coating is 12.5 μm, and the element composition of the coating is as follows: Zr, Mg, O, F, Al, and the phase structure mainly includes c-Zr 2 O, t-ZrO 2 , MgF 2 , MgO.

[0049] In this embodiment, the performance parameters of the ceramic coating are as follows: the roughness of the film layer is Ra value 0.88 μm, and no pitting occurs in the full immersion test ...

Embodiment 3

[0051] The composition of the high corrosion resistance ceramic coating solution prepared by micro-arc oxidation on the surface of magnesium alloy is as follows:

[0052] 6 g / L sodium fluozirconate, 10 g / L potassium dihydrogen phosphate, 2 g / L sodium fluoride, 6 g / L potassium sodium citrate and the balance of water; the sample is AM50 die-cast magnesium alloy. The micro-arc oxidation power supply adopts a constant voltage pulse power supply, and the parameters are 390V voltage, 1000Hz frequency, and 60% duty cycle. Its preparation method is identical with embodiment 1.

[0053] In this example, the thickness of the ceramic coating is 12.1 μm, and the element composition of the coating is as follows: Zr, Mg, O, F, Al, and the phase structure mainly includes c-Zr 2 O, t-ZrO 2 , MgF 2 , MgO( figure 2 , image 3 ,Table 1).

[0054]Table 1

[0055]

[0056]

[0057] Table 1 is with figure 2 The corresponding data, by figure 2 , image 3 It can be seen from Table ...

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Abstract

The invention relates to magnesium alloy surface treatment technology, in particular to highly corrosion-resistant ceramic coating solution prepared through magnesium alloy surface micro-arc oxidation and application thereof. The defects that a magnesium alloy workpiece has a relatively rough surface after being subjected to micro-arc oxidation treatment in fluorozirconate and is severely corroded in oxidizing solution are overcome. 1L of micro-arc oxidizing solution consists of 6 to 12g of fluorozirconate, 2 to 10g of dihydric phosphate, 2 to 8g of fluoride and 2 to 10g of citrate. A method for preparing a composite ceramic coating by using the solution comprises the following step of: treating a magnesium alloy workpiece subjected to pretreatment and the conventional micro-arc oxidation treatment respectively in the micro-arc oxidizing treatment solution to obtain the composite ceramic coating. Compared with the conventional magnesium alloy micro-arc oxidation coating, the composite ceramic coating has higher corrosion resistance, uniform thickness and low surface roughness, is compact and does not need aftertreatment such as sealing and the like; and the solution has simple components and is suitable for industrial production, and the raw materials are readily available.

Description

technical field [0001] The invention relates to a magnesium alloy surface treatment technology, in particular to a solution for preparing a high-corrosion-resistant ceramic coating on the surface of a magnesium alloy by using a micro-arc oxidation technology and a method for preparing a composite ceramic coating from the solution. Background technique [0002] Magnesium alloy has the advantages of low density, high specific strength, high specific stiffness, good shock absorption and electromagnetic shielding performance, which makes magnesium alloy used in automobiles as the lightest industrial material, but its poor corrosion resistance is the practical application of magnesium alloy. Unavoidable problems in the application process. Cars are inevitably exposed to corrosive environments during their service, so improving the corrosion resistance of magnesium alloys is of great significance for promoting the application of magnesium alloys in cars. Surface treatment technol...

Claims

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Application Information

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IPC IPC(8): C25D11/30
Inventor 刘锋单大勇宋影伟刘贤斌韩恩厚
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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