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Magnesium alloy and surface treatment method thereof

A surface treatment and surface pretreatment technology, which is applied in metal material coating process, liquid chemical plating, superimposed layer plating, etc., can solve problems such as difficult industrialization, complex activation methods, and unstable processes, and achieve High success rate, wide application range and good stability

Pending Publication Date: 2020-11-27
CHANGSHA ADVANCED MATERIALS IND RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with palladium activation, the method of non-palladium activation is low in cost, and can successfully perform electroless nickel plating on inactive substrates, but the activation method is more complicated, the process is unstable, and it is difficult to realize industrialization

Method used

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  • Magnesium alloy and surface treatment method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Polishing: Polish the VW93 rare earth magnesium alloy sample with a polishing machine and wash it with water;

[0047] Degreasing and degreasing treatment: at room temperature, wash with acetone solvent (organic solvent) for 10 minutes under the action of ultrasonic waves. The organic solvent may have release agent, polishing paste and other grease in the parts to be treated (magnesium alloy) for degreasing and degreasing cleaning;

[0048] Alkaline washing to remove ester: use lye solution containing 50g / L sodium hydroxide and 10g / L sodium phosphate dodecahydrate, and wash with alkali for 10 minutes at a temperature of 60°C. Alkaline washing is a further degreasing treatment with alkaline solution;

[0049] Pickling, derusting and etching: acid solution of 30mL / L nitric acid, pickling at room temperature for 1min, using acidic solution (pickling solution) to remove the passivation film and intermetallic segregation compounds on the surface of the magnesium alloy, so as ...

Embodiment 2

[0057] The electroless nickel plating process after the electro-oxidation passivation of the magnesium alloy is the same as in Example 1, the only difference being that the activation time is changed to 1 min. The obtained nickel coating properties are listed in Table 1.

Embodiment 3

[0059] The electroless nickel plating process after the electro-oxidation passivation of the magnesium alloy is the same as in Example 1, the only difference being that the activation time is changed to 5 minutes. The obtained nickel coating properties are listed in Table 1.

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Abstract

The invention discloses a magnesium alloy surface treatment method. The method comprises the following steps of S1, carrying out magnesium alloy surface pretreatment to obtain a clean and rough magnesium alloy surface; S2, carrying out activating treatment, specifically, placing an magnesium alloy in an activating solution containing activating particles to be activated; and S3, carrying out electro-oxidation passivation, specifically, placing the magnesium alloy into an electro-oxidation solution, and forming a passivation film on the magnesium alloy surface through a constant-pressure oxidation control method. After the magnesium alloy surface is activated, electro-oxidation passivation is carried out on the active magnesium alloy surface in an electrolysis manner, so that metal particles with chemical deposition activity can be firmly embedded into the passivation film. A process of firstly activating, then carrying out electrooxidation to form a layer of electro-oxidation passivation film with activity and finally carrying out chemical nickel plating is adopted, so that the difficulty in plating the magnesium alloy due to direct corrosion of the plating solution to a magnesiumalloy substrate is overcome. The magnesium alloy surface treatment method is suitable for all magnesium alloy substrate materials, and particularly has a better effect on chemical nickel plating of high-activity rare earth magnesium alloy and magnesium-lithium alloy substrates.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to a magnesium alloy and a surface treatment method thereof. Background technique [0002] Magnesium alloys have many unique advantages, such as low density, high specific strength and specific stiffness, and superior damping, machinability, and casting properties. They have been increasingly widely used in the automotive industry, aerospace industry, and electronics industry. Although magnesium is rich in raw materials and ranks eighth among natural resources, its poor corrosion resistance as a structural material restricts its wider use. [0003] At present, the anti-corrosion measures of magnesium alloy mainly include electroplating and electroless plating, chemical conversion coating, organic coating, vapor deposition, laser surface alloying, anodic oxidation, etc. Chemical conversion coating and anodic oxidation are widely used in industry. Anodic oxidation is a proc...

Claims

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Application Information

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IPC IPC(8): C25D11/30C23C18/16C23C18/32C23C28/00
CPCC25D11/30C23C18/32C23C18/1689C23C28/30C23C18/1653
Inventor 黄硕余刚王波李佳蔚刘永青肖宏超
Owner CHANGSHA ADVANCED MATERIALS IND RES INST CO LTD
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