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Method of treating magnesium alloy work-piece surface

The technology of workpiece surface and treatment method is applied in the field of environment-friendly preparation of protective decorative film on the surface of magnesium alloy workpiece, which can solve the problems of single color and luster of the surface film layer, serious environmental pollution, weak decorative performance, etc. Simple process and good environmental protection effect

Inactive Publication Date: 2007-08-15
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional magnesium alloy chemical conversion treatment solutions usually contain heavy metal ions Cr 6+ , high toxicity, serious environmental pollution
Although the recently published Chinese patent application No. 200510200038.4 "A Surface Treatment Method for Magnesium Alloys" (publication No. CN 1632169A) provides a conversion solution that does not contain harmful Cr 6+ , but there are still problems such as the surface film layer made by it has a single color, the decorative performance is not strong, and it is subject to many restrictions in application.

Method used

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  • Method of treating magnesium alloy work-piece surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Conversion liquid composition: sodium molybdate [Na 2 MoO 4 2H 2 O] 48g / L;

[0037] Lithium nitrate [LiNO 3 ] 5g / L.

[0038] The pH value of the conversion solution was 4.

[0039] Treatment conditions: temperature 80°C, time 5 minutes.

[0040] Film quality inspection results: The film layer is light purple, continuous, and free of defects. The spot test result is 76 seconds, and the paint film bonding force is 100%. After the workpiece is placed for 425 days, there is no change in color, and there is no peeling off or corrosion of the film layer.

Embodiment 2

[0042] Conversion liquid composition: sodium molybdate [Na 2 MoO 4 2H 2 O] 150g / L;

[0043] Sodium nitrate [NaNO 3 ], lithium sulfate [Li 2 SO 4 ·H 2 O] 20g / L (converted to LiNO 3 content).

[0044] The pH value of the conversion solution was 3.

[0045] Treatment conditions: temperature 60°C, time 15 minutes.

[0046] Film quality inspection results: the film is brown, continuous, and has no defects. The spot test result is 142 seconds, and the paint film bonding force is 100%. After the workpiece is placed for 425 days, there is no change in color, no peeling off and no corrosion of the film.

Embodiment 3

[0048] Conversion liquid composition: zirconium sulfate [ZrSO 4 4H 2 O] 5g / L (converted to Na 2 MoO 4 2H 2 O content);

[0049] Lithium sulfate [Li 2 SO 4 ·H 2 O] 1.5g / L (converted to LiNO 3 content).

[0050] The pH value of the conversion solution was 5.

[0051] Treatment conditions: temperature 40°C, time 10 minutes.

[0052] Film quality inspection results: the film is silver-gray, continuous, and has no defects. The spot test result is 83 seconds, and the paint film bonding force is 100%. After the workpiece is placed for 425 days, there is no change in color, no peeling off and no corrosion of the film.

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Abstract

The invention discloses a surface disposing method of electron alloys work piece, which is characterized by the following: including work piece fore treatment, chemical transformation treatment, drying treatment and washing treatment of each interprocess; dipping electron alloys work piece into inverting liquid of main filming matter and assistance filming matter as chemical transformation treatment; setting main filming matter as one or several zircon salt, manganic salt, molybdate and tungstate and so on transient metal salt; converting to Na2MoO4.2H2O content with density at 5-150g / L; setting the assistance filming matter as one or several nitrate and sulfate of lithium, sodium and potassium alkali metal; converting to LiNO3 content with density at 0.5-20g / L and pH value of inverting liquid at 2-6; controlling the disposing temperature at 10-90 deg.c and disposing time at 5-30 min. This surface film possesses properties of protection and decoration.

Description

technical field [0001] The invention relates to the technical field of magnesium alloy surface treatment, in particular to an environment-friendly preparation method of a protective decorative film on the surface of a magnesium alloy workpiece. Background technique [0002] Magnesium alloys are known as "green engineering materials in the 21st century" due to their advantages such as low density, high specific strength, good processing and welding and damping properties, stable dimensions, low price, and easy recycling. They are used in machinery manufacturing, automobile manufacturing, aerospace, electronics, etc. , military, communications, optical instruments, computers and other fields have a wider range of applications. However, the corrosion resistance of magnesium alloys is very poor, and they are prone to corrosion in humid atmosphere or acidic, neutral, and weakly alkaline solutions, which largely hinders the popularization and application of magnesium alloys. In a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/40C23C22/78C23C22/82C23G1/00
Inventor 李凌杰雷惊雷屈卫娟张胜涛潘复生
Owner CHONGQING UNIV
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