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Magnesium alloy surface activating process

A surface activation, magnesium alloy technology, applied in the field of surface treatment technology, can solve problems such as excessive erosion, difficult control of chemical reactions, affecting product finish and corrosion resistance

Active Publication Date: 2005-02-23
嘉瑞国际控股有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high activity of magnesium alloy, it is difficult to control the chemical reaction, and even the surface is over-eroded, which affects the smoothness and corrosion resistance of the product

Method used

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  • Magnesium alloy surface activating process

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] The production process of the present invention is: the present invention is actually applied to different magnesium alloy die-casting products, including AZ91D and AM60B alloy materials. Select AZ91D magnesium alloy die castings for activation according to the following process:

[0015]

[0016] Pumice 40-60% Na 3 PO 4 20-250g / l Sodium sulfamate 10-100g / l

[0017] SiO 2 20-30% Na 2 SiO 3 15-150g / l Sodium Fluosilicate 10-100g / l

[0018] MgO20-30% Surfactant 0.5-7.5%

[0019] h 2 O: solid = 1: 1-5

[0020] 20-90min 1-3min 1-3min 1-3min 1-3min 1-3min

[0021] 10-35℃ normal temperature 40-50℃ normal temperature normal temperature normal temperature

[0022] 500rad / min 4-8V

[0023] PH6-9PH7-10

[0024] The activated workpiece is immediately electroplated after three times of water washing.

[0025] 1. Scroll speed

20-500 rpm

2. Grinding liquid

Pumice, Silica, Magnesium Oxide, Water

3. Particle size

10-200 microns

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Abstract

Surface activation of Mg alloy is carried out by: coarsening surface mechanically and uniformly, polishing, removing oil and dirt, and activating to effectively control wearing rate of surface to verify adhesion of Mg basement with electroplated coating. A wet rotary machine is used to grind surface with grinding liquid with pH = 6 - 9, which comprises: solid content and water with ratio of (1-5:1) vol. The solid contains pumacite 40 - 60%, Mg oxide 20 - 30% and Si oxide 20 -30%. The activation can increase adhesion between Mg alloy basement and electroplated or paint coating while avoid corrosion heavily.

Description

technical field [0001] The invention relates to a surface treatment process, in particular to a magnesium alloy surface activation process. Background technique [0002] Magnesium alloy is the lightest structural metal material with a density of 1.8g / cm 3 , with excellent electromagnetic shielding and recyclability. In recent years, magnesium alloys have been widely used in electronic products, auto parts, light tools and other fields, and have great potential for development. However, magnesium alloy is relatively active, and it is easy to oxidize rapidly with oxygen and water vapor in the air during the production process to form an oxide film, resulting in poor adhesion between the electroplating layer and the magnesium alloy substrate. In order to improve the corrosion resistance of magnesium alloys and provide a variety of appearance effects, magnesium products must be used with appropriate surface treatment. The traditional activation process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/42C25F1/04
Inventor 李远发
Owner 嘉瑞国际控股有限公司
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