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Composite ceramic film on surface of magnesium alloy and its forming process

A surface composite and magnesium alloy technology, applied in anodic oxidation and other directions, can solve the problems of easy formation of holes and cracks in the film layer, and achieve the effect of beautiful color, smooth surface and easy operation

Inactive Publication Date: 2003-01-01
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ceramic films formed by these technologies are all magnesia ceramic films, which are relatively brittle and easily form holes and cracks in the film layer.

Method used

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  • Composite ceramic film on surface of magnesium alloy and its forming process
  • Composite ceramic film on surface of magnesium alloy and its forming process
  • Composite ceramic film on surface of magnesium alloy and its forming process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The sample pretreatment process is to degrease the AZ91 magnesium alloy die-casting sample in the RR-601 cleaning agent at 35°C for 10 minutes; then, neutralize it in the RR-603 surface regulator solution at 30°C for 30 seconds, and then wash it twice Perform oxidation treatment. Electrolyte solution composition:

[0033] Ethyl silicate hydrolyzate 120g / l

[0034] Sodium citrate 50g / l

[0035] NaOH 50g / l

[0036] Potassium Lactate 15g / l

[0037] Na 3 PO 4 10g / l

[0038] Sodium metaborate 10g / l

[0039] Use NaOH to adjust the pH value of the solution to 12 Micro-arc oxidation: temperature 35°C; voltage 100V; 10 minutes film quality: milky white, uniform, complete, smooth film, the total thickness of the inner and outer layers is 40 μm.

Embodiment 2

[0041] The sample pretreatment process is to ultrasonically degrease the AZ91 magnesium alloy die-casting sample in the RR-601 cleaning agent at 30°C for 15 minutes; then, neutralize it in the RR-603 surface conditioner solution at 25°C for 50 seconds, and perform two water washes followed by oxidation treatment. The electrolyte solution consists of:

[0042] Potassium silicate 100ml / l

[0043] Sodium citrate 50g / l

[0044] NaOH 50g / l

[0045]Sodium acetate 10g / l

[0046] Na 3 PO 4 10g / l

[0047] NaF 2g / l

[0048] PH value 10 micro-arc oxidation: temperature 35°C; electric jade 100V; 5 minutes, the rest are the same as in Example 1. Film quality: milky white, uniform, complete, smooth film, the total thickness of the inner and outer layers is 35 μm.

Embodiment 3

[0050] The electrolyte solution consists of:

[0051] Sodium silicate 80g / l

[0052] Sodium Potassium Tartrate 70g / l

[0053] Sodium Lactate 10g / l

[0054] Na 3 PO 4 10g / l

[0055] NaOH 20g / l

[0056] pH 11

[0057] The pretreatment conditions are basically the same as in Example 2. Micro-arc oxidation: temperature 45°C; voltage 90V; time 4 minutes Film quality: light orange, uniform, complete, smooth film, the total thickness of the inner and outer layers is 24 μm.

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Abstract

The present invention features that the composite ceramic film consists of two layers, the inner layer film of silicon-containing composite Mg-Al oxide and the outer layer film of Mg-Al silico-oxide of 5-70 micron thickness each. The composite ceramic film is formed through surface treatment, degreasing, neutralizing, water washing, micro-arc anodizing, water washing, drying, closing treatment or painting. The composite ceramic film has no holes and cracks, high corrosion resistance, high wear resistance and smooth surface.

Description

[0001] Field: [0002] The invention relates to a composite ceramic film on the surface of a magnesium alloy and a production method, more precisely, the composite ceramic film is formed on the surface of a magnesium alloy by micro-arc anodic oxidation treatment. The invention belongs to the field of magnesium alloy surface treatment. Background technique: [0003] Due to its small specific gravity, large energy attenuation coefficient, excellent electromagnetic shielding performance and suitable for mass production of die-casting, magnesium alloy has attracted more and more attention in the fields of aerospace, electronics, and automobile manufacturing. Especially in recent years, the application of high-grade magnesium products such as notebook computer casings, digital cameras, mobile phones, and car parts has achieved rapid development, and the market prospect is very broad. [0004] However, due to the active chemical properties of magnesium, magnesium products must be p...

Claims

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Application Information

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IPC IPC(8): C25D11/30
Inventor 黄元伟卫中领
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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