AZ31M alloy as well as preparation method and application thereof

A technology of alloy and alloy composition, which is applied in the field of AZ31M alloy and its preparation, can solve the problems of reducing current efficiency, inability to prevent corrosion of metal materials, and accelerate microcouple corrosion, etc., and achieve the effect of convenient operation, simple process and obvious protection effect

Inactive Publication Date: 2021-04-13
NORTHEAST DIANLI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as far as the AZ series magnesium anode is concerned, some elements in the alloy (such as elements with low oxygen evolution overpotential) will promote the self-dissolution of magnesium in the corrosive medium, and the impurity elements such as Fe, Ni, Cu, etc. Will act as a cathodic phase, accelerating the formation of microgalvanic corrosion, thereby reducing current efficiency
Due to the above reasons, the existing magnesium-based sacrificial anodes can not play a good anti-corrosion effect on metal materials

Method used

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  • AZ31M alloy as well as preparation method and application thereof
  • AZ31M alloy as well as preparation method and application thereof
  • AZ31M alloy as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0029] In this embodiment, the mass percentage of each element of an AZ31M alloy is as follows, Mg: 94.9%, Al: 3%, Zn: 1%, M: 1.1%.

[0030] Weigh each raw material, including pure magnesium: 99.99%, pure aluminum: 99.99%, pure zinc: 99.99% and Mg-25M master alloy;

[0031] Grind the surface of the cut magnesium block to remove the oxide film on the surface, clean the crucible for smelting, put magnesium alloy and covering agent: MgCl in the crucible 2 : KCl=1:1, then put the crucible into the oven and dry at 80°C for 30 minutes; 5 minutes before melting, open the ventilation valve and inject carbon dioxide protective gas; 1 minute before melting, open the circulating cooling water valve;

[0032] Turn on the light alloy smelting furnace, raise the furnace cover, move the furnace body to the left, put the dried crucible into the furnace smoothly, put the magnesium ingot in the middle of the crucible, evenly cover the magnesium ingot with the covering agent, move the furnace bo...

Embodiment 2

[0037] In this embodiment, the mass percentage of each element of an AZ31M alloy is as follows, Mg: 95.7%, Al: 3%, Zn: 1%, M: 0.3%.

[0038] Weigh each raw material, including pure magnesium: 99.99%, pure aluminum: 99.99%, pure zinc: 99.99% and Mg-25M master alloy;

[0039] Grind the surface of the cut magnesium block to remove the oxide film on the surface, clean the crucible for smelting, put magnesium alloy and covering agent: MgCl in the crucible 2 : KCl=1:1, then put the crucible into the oven and dry at 80°C for 30 minutes; 5 minutes before melting, open the ventilation valve and inject carbon dioxide protective gas; 1 minute before melting, open the circulating cooling water valve;

[0040] Turn on the light alloy smelting furnace, raise the furnace cover, move the furnace body to the left, put the dried crucible into the furnace smoothly, put the magnesium ingot in the middle of the crucible, evenly cover the magnesium ingot with the covering agent, move the furnace body...

Embodiment 3

[0045] In this embodiment, the mass percentages of elements of an AZ31M alloy are as follows, Mg: 94.7%, Al: 3%, Zn: 1%, M: 1.3%.

[0046] Weigh each raw material, including pure magnesium: 99.99%, pure aluminum: 99.99%, pure zinc: 99.99% and Mg-25M master alloy;

[0047] Grind the surface of the cut magnesium block to remove the oxide film on the surface, clean the crucible for smelting, put magnesium alloy and covering agent: MgCl in the crucible 2 : KCl=1:1, then put the crucible into the oven and dry at 80°C for 30 minutes; 5 minutes before melting, open the ventilation valve and inject carbon dioxide protective gas; 1 minute before melting, open the circulating cooling water valve;

[0048] Turn on the light alloy smelting furnace, raise the furnace cover, move the furnace body to the left, put the dried crucible into the furnace smoothly, put the magnesium ingot in the middle of the crucible, evenly cover the magnesium ingot with the covering agent, move the furnace body...

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Abstract

The invention relates to an AZ31M alloy. The AZ31M alloy is characterized by being expressed as Mg-3Al-1Zn-xM in percentage by mass, wherein x is 0wt%, 0.3wt%, 0.5wt%, 0.7wt%, 0.9wt%, 1.1wt% or 1.3wt%; Mg is 94.7% to 95.7%; Al is 3%; Zn is 1%; and M is 0.3% to 1.3%. According to a preparation method of the AZ31M alloy, an RLL-1100 light alloy smelting furnace is adopted, operation is convenient, and the process is simple. Through the application of a magnesium alloy anode of the AZ31M alloy to cathode protection of carbon steel, the weight loss ratio after operation for 60 days is only 0.57%, and the protection effect is remarkable. In all magnesium anodes, the protection effect of AZ31M is better, and higher current efficiency is achieved.

Description

technical field [0001] The invention relates to the field of alloy materials, in particular to an AZ31M alloy and its preparation method and application. Background technique [0002] In the power system, in order to ensure the safe operation of the power substation, the grounding device needs to be buried in the soil, but the grounding device is facing serious natural corrosion, and with the increase of power capacity in my country in recent years, the AC and DC grounding device is forced to corrode It is getting more and more serious, and major electric safety accidents caused by grounding grid corrosion have occurred frequently in China. There are many ways to prevent metal corrosion, mainly to improve the corrosion resistance of the metal itself, coating method, corrosive medium treatment method and cathodic protection method. Cathodic protection is to achieve metal anti-corrosion effect through external current or sacrificial anode. The sacrificial anode method has the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/02C22C1/03C23F13/14
CPCC22C1/03C22C23/02C23F13/14
Inventor 王嵬刘倩马月魏大卫刘艇安纪翰林吴春华
Owner NORTHEAST DIANLI UNIVERSITY
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