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A kind of magnesium-lithium alloy surface pretreatment method

A magnesium-lithium alloy and a treatment method technology, applied in the field of metal surface treatment, can solve problems such as unsatisfactory treatment effect, and achieve the effects of good surface conditions, improved performance and good surface activity

Active Publication Date: 2019-10-01
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The surface pretreatment methods of magnesium-lithium alloys in the prior art have unsatisfactory treatment effects

Method used

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  • A kind of magnesium-lithium alloy surface pretreatment method
  • A kind of magnesium-lithium alloy surface pretreatment method
  • A kind of magnesium-lithium alloy surface pretreatment method

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0037] The magnesium-lithium alloy surface pretreatment method of the present invention, its preferred embodiment is:

[0038] Including mechanical treatment methods and chemical treatment methods;

[0039] Described mechanical treatment method comprises:

[0040] Step 1: Preliminary machining of the magnesium-lithium alloy to the desired shape;

[0041] Step 2: Grind the processed workpiece with coarse and fine sandpaper, and polish it with a polishing machine until the surface is smooth and has a metallic luster;

[0042] Step 3: Soak the workpiece in acetone and clean it with ultrasonic vibration for 5 to 15 minutes, and then place the workpiece in acetone to prevent air oxidation;

[0043] Described chemical treatment method comprises:

[0044] Step 4: quickly dry the magnesium-lithium alloy that has undergone mechanical pretreatment, and place it in a degreasing agent for 3 to 6 minutes at a temperature of 40 to 60 degrees Celsius;

[0045] Step 5: Clean the workpiece...

Embodiment 1

[0063] The magnesium-lithium alloy plate was cut into 30mm×30mm×3mm samples through preliminary machining, washed with deionized water, dried with hot air, and polished with emery cloth to remove the surface oxide skin, and the original sample with the surface of the magnesium-lithium alloy matrix was obtained. figure 2 As shown, the original sample was placed in humid air for 72 hours, and the magnesium-lithium alloy was obtained under the natural environment for 72 hours, such as image 3 shown. Its SEM image is shown in Figure 4.

[0064] The original sample is subjected to mechanical pretreatment, that is, using 400#, 800#, 1000#, 1500# sandpaper to grind the surface of the workpiece from coarse to fine, and then polish it. Soak it in acetone solution for 5-15 minutes, and dry it with hot air. Prepare degreasing agent, etchant 1 and etchant 2 according to the method described in the technical scheme. according to figure 1 The flow chart shown completes the pretreatmen...

Embodiment 2

[0068] This implementation example introduces an example of "pre-treatment" + "micro-arc oxidation" surface treatment. The specific methods are as follows:

[0069] First, the magnesium-lithium alloy plate is cut into 30mm×30mm×3mm samples through preliminary machining, and the surface of the workpiece is polished from coarse to fine with 400#, 800#, 1000#, 1500# sandpaper, and then polished, and Clean ultrasonically in acetone and dry with hot air. Prepare degreasing agent, etchant 1 and etchant 2 according to the method described in the technical scheme. according to figure 1 The flow chart shown completes the pre-processing. The obtained samples were air-dried for later use.

[0070] Secondly, prepare the micro-arc oxidation electrolyte, take a clean container, add deionized water, KOH, Na 2 SiO 3 Formulated with 5g / L KOH and 10g / L Na 2 SiO 3 base electrolyte. Then the pretreated samples were subjected to micro-arc oxidation treatment. Pour the basic electrolyte in...

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Abstract

The invention discloses a pretreatment method of the surface of a magnesium-lithium alloy. The pretreatment method comprises a mechanical pretreatment method, a chemical pretreatment method and a surface treatment method; the mechanical pretreatment method comprises the following steps that the magnesium-lithium alloy to be treated is subjected to machining, surface polishing and ultrasonic vibration cleaning, and the surface of the magnesium-lithium alloy after treatment is smooth, bright and clean; the chemical pretreatment method comprises the following steps that the magnesium-lithium alloy after the mechanical pretreatment is immersed into a degreasant for a while and is cleaned with deionized water, then the magnesium-lithium alloy is immersed into a first etchant and a second etchant sequentially, and finally the sample is cleaned with the deionized water, and the magnesium-lithium alloy is dried with hot wind; and the surface treatment method comprises the following steps thatthe magnesium-lithium alloy is subjected to the surface treatment processes such as electroplating, anodic oxidation, coating, thermal spraying and micro-arc oxidation. The surface of the magnesium-lithium alloy which is subjected to the pretreatment method has certain corrosion resistance, and can be placed in the air environment for a relatively long time; and as the surface after the pretreatment has the higher activity, the property of a film during aftertreatment can be improved to some extent, and components of the surface of the magnesium-lithium alloy can not be affected.

Description

technical field [0001] The invention relates to a metal surface treatment method, in particular to a magnesium-lithium alloy surface pretreatment method. Background technique [0002] Metal surface treatment technology is a technology that uses chemical or physical methods to artificially form a film layer with different properties from the surface of the substrate on the surface of the metal substrate. Its purpose is to improve the corrosion resistance, wear resistance, insulation, decoration, and other requirements of the substrate surface. The current mainstream surface treatment technologies include: electroplating, anodizing, painting, thermal spraying, micro-arc oxidation, etc. It is widely used in social life, electronic communication, aerospace, military industry, etc. [0003] Magnesium-lithium alloy is the metal structure material with the lowest density in the world. It has the characteristics of large damping and high strength, and its ability to be plasticall...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G5/032C23G1/22C23F1/22C23F1/40
Inventor 张优田昊阅陈飞李浙锋刘欣齐佳
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY