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Process for improving corrosion-resisting property of magnesium alloy

A magnesium alloy and corrosion resistance technology, which is applied in the field of cryogenic treatment of magnesium alloy modification, can solve the problems of coatings that are easy to pollute the environment, corrode, and affect health, and achieve the effect of avoiding poor bonding and improving corrosion resistance

Inactive Publication Date: 2012-04-11
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the coating method has a certain protective effect on metals, because the polymer coating is easy to age in the natural environment, and the bonding strength with the base metal is not good, especially the coating is easy to pollute the environment and affect health
Due to the activity of the magnesium alloy itself and the easy oxidation of the surface, the coating process is difficult, and the damage of the coating during use will even cause more serious corrosion.
The corrosion-resistant oxide film formed by anodic oxidation can also be used as a barrier layer to protect magnesium alloys, but the film is porous and cannot protect magnesium alloys well after damage

Method used

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  • Process for improving corrosion-resisting property of magnesium alloy
  • Process for improving corrosion-resisting property of magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Solid solution treatment: Put the ceramic crucible with potassium nitrate into a box-type heat treatment furnace, and heat it up to 415°C to melt it; AZ91D magnesium alloy (Al 8.5wt%~9.5wt%, Zn 0.45wt %~0.9wt%, Mg 90~91wt%) sample is placed in the crucible, so that the surface of the sample is completely submerged in the molten salt, keep warm for 10b, take out the sample and put it in water to cool down, take it out and dry it for later use;

[0021] (2) Aging treatment: put the sample after the solid solution treatment in step (1) into a molten salt crucible at 220°C, keep it warm for 7 hours, take out the sample and wash and dry it for later use;

[0022] (3) Cryogenic treatment: the magnesium alloy sample after solid solution and aging treatment was placed in liquid nitrogen at -196°C, placed for 15 hours for cryogenic treatment, and then the sample was taken out.

Embodiment 2

[0024] (1) Solid solution treatment: put the ceramic crucible with potassium nitrate into the box-type heat treatment furnace, and heat it up to 415°C with the furnace to melt it; put the AZ91D magnesium alloy sample into the crucible, so that the surface of the sample is completely immersed In molten salt, keep warm for 10h, take out the sample and put it in water, take it out and dry it for later use;

[0025] (2) Aging treatment: put the sample after the solid solution treatment in step (1) into a molten salt crucible at 220°C, keep it warm for 7 hours, take out the sample and wash and dry it for later use;

[0026] (3) Cryogenic treatment: the magnesium alloy sample after solid solution and aging treatment was placed in liquid nitrogen at -196°C, placed for 72 hours for cryogenic treatment, and then the sample was taken out.

[0027] The reference substance was only processed through the steps (1) and (2) of Example 1, without cryogenic treatment. The corrosion resistance...

Embodiment 3

[0029] (1) Solid solution treatment: put the ceramic crucible containing potassium nitrate into the box-type heat treatment furnace, and heat it up to 430°C to melt it; put the AZ91D magnesium alloy sample into the crucible, so that the surface of the sample is completely immersed In molten salt, keep warm for 15 hours, take out the sample and put it in water to cool down, take it out and dry it for later use;

[0030] (2) Aging treatment: put the sample after the solid solution treatment in step (1) into a molten salt crucible at 260°C, keep it warm for 5 hours, take out the sample and wash and dry it for later use;

[0031] (3) Cryogenic treatment: the magnesium alloy sample after solid solution and aging treatment was placed in liquid nitrogen at -190° C., placed for 2 hours for cryogenic treatment, and then the sample was taken out.

[0032] Compared with the magnesium alloy without cryogenic treatment in step (3), the self-corrosion potential of the magnesium alloy after ...

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Abstract

The invention discloses a process for improving the corrosion-resisting property of magnesium alloy by utilizing subzero treatment. The process comprises solution treatment, aging treatment and subzero treatment. Compared with the prior art, the invention adopts the magnesium alloy subzero treatment process to realize the purpose of improving the corrosion-resisting property of magnesium alloy base metal, and avoids the defects that the bonding force is poor, coating is damaged and the like when surface coating treatment is adopted.

Description

technical field [0001] The invention relates to a method for improving the corrosion resistance of magnesium alloys by cryogenic treatment, in particular to a cryogenic treatment process for modification of magnesium alloys, and belongs to the technical field of material modification treatment. Background technique [0002] In industrial production, magnesium alloys have attracted more and more attention due to their unique advantages, and the research on various processing methods of magnesium alloys has also attracted more and more attention. Magnesium alloys are prone to corrosion in the natural environment, which affects the function and appearance, making it difficult for the metal to meet the needs of the use environment. At present, surface treatment methods such as coating and anodizing are mostly used to improve the corrosion resistance of metals. [0003] Although the coating method has a certain protective effect on metals, because the polymer coating is easy to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06
Inventor 刘继华钱士强沈锦
Owner SHANGHAI UNIV OF ENG SCI
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