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Method for electroplating inorganic molten salt on surface of magnesium and magnesium alloy with aluminum

A molten salt and magnesium alloy technology, applied in the field of inorganic molten salt electroplating aluminum on the surface of magnesium and magnesium alloys, can solve the problems of inability to be popularized and used in large areas, poor coating adhesion, non-densification and incompleteness, etc., to achieve low-cost equipment, prevent Corrosion, combined with good effect

Inactive Publication Date: 2009-09-30
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are various problems in these preparation technologies, such as expensive equipment, which cannot be widely used, or the obtained coating has poor bonding force, is not dense and incomplete, and is difficult to do further surface treatment, which is far from meeting the needs of magnesium in practical applications. Alloys in high demand

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Material preparation: Pure magnesium is cleaned and degreased by ultrasonic cleaning in acetone solution after cutting and grinding.

[0021] 2. Etching: 85% H 3 PO 4 5ml / L, NH 4 HF 2 100g / L, the rest is water, the temperature is 10~35℃. Treat for 0.5 to 5 minutes, wash with tap water for 1 to 2 minutes immediately after taking it out, and then wash with deionized water for 1 to 2 minutes.

[0022] 3. Activation: Na 4 P 2 o 7 40g / L, Na 2 B 4 o 7 70g / L, NaF 20g / L, and the rest is water. The temperature is 70-80°C, and it is treated for 2-5 minutes. After taking it out, it is immediately washed with tap water for 1-2 minutes, and then with deionized water for 1-2 minutes.

[0023] 4. Dip zinc: ZnSO 4· 7H 2 O 30g / L, Na 4 P 2 o 7 120g / L, NaF 5g / L, LiF 3g / L, NaF 2 CO 3 5g / L, the rest is water. pH = 10.0-10.6, temperature 75-85°C, treatment for 30-90 minutes, immediately after taking out, wash with tap water for 1-2 minutes, and then wash with deion...

Embodiment 2

[0028] 1. Material preparation: After AZ31B magnesium alloy is cut and polished, use ultrasonic cleaning in acetone solution to remove oil.

[0029] 2. Etching: 85% H 3 PO 4 2~5ml / L, temperature 40~70℃, the rest is water. Treat for 0.5 to 5 minutes, wash with tap water for 1 to 2 minutes immediately after taking it out, and then wash with deionized water for 1 to 2 minutes.

[0030] 3. Galvanizing: ZnSO 4 ·7H 2 O36g / L, Na 4 P 2 o 7 10H 2 O 134g / L, C 6 h 5 Na 3 o 7 2H 2 O10g / L, KF 2H 2 O 10g / L, sodium lauryl sulfate 0.1g / L, and the rest is water. pH=9.0~10.0, temperature 40~70℃, cathode current density 0.1~0.5A / dm 2 , the time is 50-60 minutes, and immediately after taking it out, wash it with tap water for 1-2 minutes, and then wash it with deionized water for 1-2 minutes. The thickness of the zinc layer in this embodiment is 5-8um.

[0031] 4. Light: HNO 3 30ml / L, HCl 10ml / L, the rest is water. The temperature is 10-35°C, and the treatment is for 5-30 secon...

Embodiment 3

[0037] 1. Material preparation: After AZ31B magnesium alloy is cut and polished, use ultrasonic cleaning in acetone solution to remove oil.

[0038] 2. Etching: Na 4 P 2 o 7· 10H 2 O 40g / L, Na 2 CO 3 3.7g / L, NaNO 3 5g / L, NaH 2 PO 4· 2H 2 0 5g / L, the rest is water. The temperature is 50-70°C, and it is treated for 0.5-5 minutes. After taking it out, it is immediately washed with tap water for 1-2 minutes, and then with deionized water for 1-2 minutes.

[0039] 3. Activation: HF 30ml / L, ZnO 20g / L, the rest is water. The temperature is 10-35°C, and it is treated for 0.5-5 minutes. After taking it out, it is immediately washed with tap water for 1-2 minutes, and then with deionized water for 1-2 minutes.

[0040] 4. Galvanizing: ZnSO 4· 7H 2 O 35.6g / L, Na 4 P 2 o 7· 10H 2 O 134g / L, C 6 h 5 Na 3 o 7· 2H 2 O10g / L, KF.2H 2 O 10g / L, sodium lauryl sulfate 0.1g / L, and the rest is water. pH=9.0~10.0, temperature 40~70℃, cathode current density 0.2~0.5A / dm 2 , t...

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Abstract

The invention relates to a method for electroplating inorganic molten salt on surface of magnesium and magnesium alloy with aluminum, which belongs to the technical field of metal surface treatment. The method comprises a step of preplating a zinc layer as a substrate and a step of electroplating inorganic molten salt with aluminum. The step of preplating the zinc layer as the substrate comprises a step of immersion-plating the zinc layer and a step of electroplating the zinc layer. The step of electroplating the zinc layer is performed in an inorganic molten salt system, wherein anhydrous aluminum chloride is main salt, and sodium chloride, potassium chloride or a mixture of the two is a main complexing agent. An aluminum coating obtained by the method is complete, dense, uniform and bright, is firmly combined with a matrix, can be individually used as a protective layer, and can be prepared into a surface functional layer with better corrosion resistance, better wear resistance and high hardness through subsequent treatment. The whole process of the method has the advantages of simple process, cheap equipment, friendliness to environment, and the like.

Description

Technical field: [0001] The invention relates to a method for electroplating aluminum with inorganic molten salt on the surface of magnesium and magnesium alloys, belonging to the technical field of metal surface treatment. Background technique: [0002] Magnesium alloy has the advantages of low density, high specific strength, and good electromagnetic shielding performance. It is known as a green engineering material in the 21st century and has a wide range of application values ​​in the automotive industry, aerospace industry and electronics industry. However, poor corrosion resistance, poor wear resistance, and low hardness have become bottlenecks restricting the application of magnesium alloys, limiting their large-area use. Therefore, in order to enable magnesium alloys to be used in harsher environments, it is necessary to develop corresponding surface treatment technologies for magnesium alloys. The surface treatment technologies currently developed on magnesium allo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/06
Inventor 张吉阜赖庆凡严川伟王福会
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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