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Zinc-aluminum-magnesium rare earth corrosion-resistant coating

A zinc-aluminum-magnesium coating technology, which is applied in the coating, metal material coating process, molten spraying, etc., can solve the problem that the corrosion resistance of the zinc-aluminum alloy coating cannot meet the anticorrosion of the steel surface, and achieve a wide range of applications Effect

Inactive Publication Date: 2012-07-04
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for complex corrosive environments, such as acid rain and coastal areas, the corrosion resistance of zinc-aluminum alloy coatings still cannot meet the anti-corrosion requirements of steel surfaces.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] According to the zinc-aluminum-magnesium rare earth alloy coating of the present invention, the weight percentages of the components are: Al is 5%, Mg is 0.05%, La is 0.05%, and the balance is Zn.

[0018] Its preparation method is as follows:

[0019] (1) Take each raw material by the above weight percentage;

[0020] (2) Among them, aluminum ingots are used for Al, and then the aluminum ingots are put into the furnace to be heated. After the aluminum ingots are partially melted, zinc blocks are added, and finally Zn-5%Mg master alloy and AlRe10 aluminum-based rare earth master alloy are added. The melting temperature is controlled at 580~600°C, and the overheating temperature is controlled at 80~100°C. After the charge is fully melted in the molten pool, slag removal and stirring are carried out, and then samples are taken to detect and adjust the composition, refined, and poured into zinc-aluminum-magnesium rare earth alloy ingots at a pouring temperature of 510~550...

Embodiment 2

[0026] The zinc-aluminum-magnesium rare earth alloy coating has the following components by weight percentage: Al 8.0%, Mg 0.06%, La 0.03%, Ce 0.04%, and the balance Zn. The preparation method is the same as in Example 1.

[0027] The preparation method is the same as in Example 1.

[0028] The corrosion resistance test is the same as in Example 1. The weight change of the sample before and after corrosion was measured by the weight loss method, and the weight loss of the pure zinc layer was 2.2 times that of the zinc-aluminum-magnesium rare-earth coating, which indicated that the salt-water corrosion resistance of the zinc-aluminum-magnesium rare-earth coating was 2.2 times that of the pure zinc layer.

Embodiment 3

[0030] The zinc-aluminum-magnesium rare earth alloy coating has the following components by weight percentage: Al 14%, Mg 0.08%, Ce 0.08%, and the balance Zn. The preparation method is the same as in Example 1.

[0031] The preparation method is the same as in Example 1.

[0032] The corrosion resistance test is the same as in Example 1. The weight change of the sample before and after corrosion was measured by the weight loss method, and the weight loss of the pure zinc layer was 2.2 times that of the zinc-aluminum-magnesium rare-earth coating, which indicated that the salt-water corrosion resistance of the zinc-aluminum-magnesium rare-earth coating was 2.2 times that of the pure zinc layer.

[0033] Further, the zinc-aluminum-magnesium rare earth alloy coating with basically similar properties has the following components by weight percentage: Al 14.0-14.5%, Mg 0.05-0.1%, RE (La and Ce) 0.05-0.1%, and the balance Zn. The preparation method is the same as in Example 1.

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PUM

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Abstract

The invention discloses a zinc-aluminum-magnesium rare earth corrosion-resistant coating, which contains the following components in percentage by weight: 5-23 percent of Al, 0.05-0.1 percent of Mg, 0.05-1 percent of rare earth metal RE and the balance of Zn. In the zinc-aluminum-magnesium rare earth corrosion-resistant coating, the rare earth metal RE is at least one of La and Ce. The zinc-aluminum-magnesium rare earth corrosion-resistant coating in accordance with the invention has wide application range, and meets the steel and iron corrosion resistance requirements under different environments; and brine corrosion resistance performance is over 2 times that of a pure zinc layer.

Description

technical field [0001] The invention relates to a zinc-aluminum-magnesium rare earth anticorrosion coating, which is used for anticorrosion of steel surfaces. Background technique [0002] Hot-dip galvanizing is a conventional technology for steel anti-corrosion. The cleaned iron parts are immersed in a zinc bath through wetting, so that the steel and molten zinc react to form an alloyed film. The surface of the steel treated in this way can be well protected, whether it is the inside of the pipe fitting in the depression or the corner where other coatings are difficult to enter, and the zinc layer is also very slowly consumed in the atmosphere. However, with the deterioration of the climate and environment, the traditional pure zinc layer can no longer meet the anti-corrosion requirements of steel components. In order to improve the anti-corrosion effect, zinc-aluminum alloy coatings have been invented, such as Galfan (Zn-5Al-RE) coating and Galvalume (Zn-55Al-1.6Si) coati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C18/04C23C4/08C23C4/131
Inventor 李辛庚王学刚王晓明闫风洁王宏胡新芳傅敏岳增武
Owner STATE GRID CORP OF CHINA
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