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Method for electroplating magnesium and magnesium alloy

A magnesium alloy and coating technology, which is applied in the field of electroplating of magnesium and magnesium alloys, can solve problems such as hindering metal deposition, increasing the porosity of the coating, and loose bonding of the coating

Inactive Publication Date: 2005-11-23
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The electroplating of magnesium and magnesium alloys is very difficult. The reasons include: (1) the chemical properties of magnesium and magnesium alloys are active, and magnesium oxide will form rapidly on the surface of the alloy, hindering metal deposition; The replacement reaction with other metal ions in the solution is strong, resulting in loose bonding of the coating; (3) poor casting quality, resulting in increased porosity of the coating and reduced corrosion resistance; (4) because the standard potential of the coating is much greater than that of the magnesium alloy substrate, so The coating must be non-porous, otherwise electrochemical corrosion will be faster

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Take 100×100×5mm magnesium alloy castings.

[0048] 1. Dehydrogenation. Put the castings in a resistance furnace, control the temperature to 180°C, hold for 1.5h, and perform dehydrogenation treatment to prevent hydrogen embrittlement.

[0049] Component

Content (g / L)

Sodium pyrophosphate (saponification)

Sodium phosphate (descaling, chelating, emulsification)

Sodium tripolyphosphate (softened water, anti-scaling)

Emulsifier polyether 2070 (wetting, penetrating, rolling off)

Deionized water

19

14

7

2

Margin

[0050] The components other than the above-mentioned deionized water are respectively dissolved in deionized water according to the formula ratio, mixed to prepare an aqueous solution, and put into a tank for use.

[0051]The magnesium alloy castings to be processed are immersed in the above-mentioned aqueous solution, and the solution temperature is maintained at 57° C., and the immersion treatment is performed for 9 mi...

Embodiment 2

[0071] Take 100×100×5mm magnesium alloy castings.

[0072] 1. Dehydrogenation. Put the castings in a resistance furnace, control the temperature to 200°C, hold for 2 hours, and perform dehydrogenation treatment.

[0073] Component

Content (g / L)

Sodium pyrophosphate (saponification)

Sodium phosphate (descaling, chelating, emulsification)

Sodium tripolyphosphate (softened water, anti-scaling)

Emulsifier polyether 2070 (wetting, penetrating, rolling off) polyether

Deionized water

twenty three

12

8

3

Margin

[0074] The components other than the above-mentioned deionized water are respectively dissolved in deionized water according to the formula ratio, mixed to prepare an aqueous solution, and put into a tank for use.

[0075] The magnesium alloy castings to be processed are immersed in the above-mentioned aqueous solution, and the temperature of the solution is maintained at 55° C. for 8 minutes.

[0076] 3. Wash with hot water. The ...

Embodiment 3

[0098] Take 100×100×5mm magnesium alloy castings.

[0099] 1. Dehydrogenation. Put the castings in a resistance furnace, control the temperature to 180°C, hold for 2 hours, and perform dehydrogenation treatment.

[0100] Component

Content (g / L)

Sodium pyrophosphate (saponification)

Sodium phosphate (descaling, chelating, emulsification)

Sodium tripolyphosphate (softened water, anti-scaling)

Emulsifier polyether 2070 (wetting, penetrating, rolling off) polyether

Deionized water

20

16

6

1.5

Margin

[0101] The components other than the above-mentioned deionized water are respectively dissolved in deionized water according to the formula ratio, mixed to prepare an aqueous solution, and put into a tank for use.

[0102] The magnesium alloy castings to be processed are immersed in the above-mentioned aqueous solution, and the temperature of the solution is maintained at 56°C for 8 minutes.

[0103] 3. Wash with hot water. The abov...

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Abstract

The present invention provides an electroplating method of magnesium and magnesium alloy. The technology comprises dehydrogen, chemical degreasing, shining, neutralization, activation, pre-plating, functional plating, decorative plating and post treatment. The cast workpiece must be water-washed between every two procedures. The current density of pre-plating is 5-15 A / dm2, cell voltage 4-12 V, pH value of pre-plating solution 1.0-1.2, and Baume degree at room temperature is 30-35. Pre-plating solution recipe contains: copper fluoborate, fluoboric acid, alanine, polyethylene glycol and alizarin dye, mixture of itaconic acid and MBT, 3-S isothiourea onium salt propane sulfonate ,R-S-S(CH2)SO3Na and deionization water. The pre-plating solution of the present invention is cyanogen free, non-toxic and non-hazardous. Bond strength between pre-plating layer and substrate material and between pre-plating layer and the post functional plating layer or decorative plating layer is good. The plating layer is bright and has good corrosion resistance, wear resistance and decorative effect.

Description

Technical field [0001] The present invention relates to the technical field of surface treatment of metals, in particular to electroplating methods of magnesium and magnesium alloys. Background technique [0002] As a kind of lightweight engineering structural materials, magnesium and magnesium alloys are used more and more widely, because magnesium and magnesium alloys have the advantages of good shock absorption, low density, high specific strength and high specific rigidity. However, magnesium and magnesium alloys also have disadvantages such as poor heat resistance, poor corrosion resistance, poor wear resistance and poor decoration, which limit their application fields. At present, the main surface treatments of magnesium and magnesium alloys at home and abroad are as follows: [0003] 1. Chemical oxidation and electrochemical oxidation. After this method, the surface hardness is low, the decoration is poor, and the corrosion resistance is improved, but it cannot be used alo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/30
Inventor 李德高刘正葛宜银林立
Owner SHENYANG POLYTECHNIC UNIV
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