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A corrosion-resistant bracket

A corrosion-resistant, magnesium alloy technology, applied in the field of corrosion-resistant brackets, can solve the problems of easy falling off, poor corrosion resistance and limitations of magnesium and its alloys, and achieve improved strength and corrosion resistance, small diffusion coefficient, and improved heat resistance Effect

Active Publication Date: 2020-08-07
宁波晋畅机电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Magnesium alloys also have the advantages of high specific strength, good processing performance, and large energy attenuation coefficient, but the electrode potential of magnesium is very low (-2.37V), and an oxide film will be formed even in the atmospheric environment, and this oxide film The PBR value of magnesium is less than 1 (0.99), and the constant temperature oxidation kinetics curve is linear. Therefore, the natural oxide film of magnesium is loose and porous and easy to fall off, resulting in poor corrosion resistance of magnesium and its alloys, and its application is limited.

Method used

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  • A corrosion-resistant bracket

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Ball milling powder: Weigh the magnesium alloy raw materials into a ball mill, and add 1.2% of the magnesium alloy raw materials mass under Ar gas for ball milling. The speed of the ball mill is 480r / min and the milling time is 6h to obtain powder; magnesium The alloy is composed of the following components by mass percentage: Al: 6.8%, Zn: 0.38%, Mn: 0.2%, Si: 0.1%, Nd: 0.1%, Ca: 0.12%, La: 0.50%, and the balance is Mg.

[0026] Cold rolled billet: the powder is pressed into a bracket blank under vacuum and room temperature;

[0027] Heat treatment: heat the blank at 540°C for 8 hours, then cool it with the furnace, then heat it to 315°C at a rate of 1.5°C / s, cool it to room temperature after 3 hours in air, to obtain a semi-finished bracket;

[0028] Micro-arc oxidation: immerse the semi-finished stent and stainless steel needles in the electrolyte, connect an external power supply, control the current density and power-on time for micro-arc oxidation; the temperature of the...

Embodiment 2

[0031] Ball milling powder: Weigh the magnesium alloy raw materials into a ball mill, and add 1.0% of the magnesium alloy raw materials to the mass of the magnesium alloy raw materials under Ar gas for ball milling. The speed of the ball mill is 460r / min and the milling time is 7 hours to obtain powder; magnesium The alloy is composed of the following mass percentage components: Al: 6.9%, Zn: 0.36%, Mn: 0.22%, Si: 0.09%, Nd: 0.12%, Ca: 0.1%, La: 0.60%, and the balance is Mg.

[0032] Cold rolled billet: the powder is pressed into a bracket blank under vacuum and room temperature;

[0033] Heat treatment: heat the blank at 530°C for 8 hours, cool it with the furnace, then heat it up to 310°C at a rate of 1.2°C / s, cool it in air to room temperature after holding it for 4 hours, to obtain a semi-finished bracket;

[0034] Micro-arc oxidation: Immerse the semi-finished stent and stainless steel needles in the electrolyte, connect an external power supply, control the current density and ...

Embodiment 3

[0037] Ball milling powder: Weigh the magnesium alloy raw materials into a ball mill, add 1.4% of the magnesium alloy raw materials mass to anhydrous ethanol for ball milling under Ar gas, the speed of the ball mill is 490r / min, and the milling time is 6h to obtain powder; magnesium The alloy is composed of the following components in mass percentages: Al: 6.6%, Zn: 0.38%, Mn: 0.16%, Si: 0.11%, Nd: 0.08%, Ca: 0.14%, La: 0.40%, and the balance is Mg.

[0038] Cold rolled billet: the powder is pressed into a bracket blank under vacuum and room temperature;

[0039] Heat treatment: heat the blank at 525°C for 7 hours, then cool it with the furnace, then heat it up to 325°C at a rate of 1.8°C / s, and cool it to room temperature after 3 hours in air to obtain a semi-finished bracket;

[0040] Micro-arc oxidation: Immerse the semi-finished stent and stainless steel needles in electrolyte, connect an external power supply, control the current density and power-on time for micro-arc oxidation...

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Abstract

The invention relates to an anti-corrosion bracket, and belongs to the technical field of alloy materials. The anti-corrosion bracket is made of magnesium alloy which comprises, by mass, 6.5-7.0% of Al, 0.35-0.4% of Zn, 0.15-0.25% of Mn, 0.08-0.12% of Si, 0.05-0.15% of Nd, 0.08-0.15% of Ca, 0.20-0.80% of La and the balance Mg. The bracket is made of the magnesium alloy which is reasonable in proportion, a blank is manufactured through cold rolling, then, the blank is heated to the high temperature and subjected to heat preservation, through the momentary temperature difference, the strength ofthe blank is improved, the heat preservation time is shortened, the temperature is increased to the low temperature after cooling, and a good-performance blank can be obtained; and then, the semi-finished bracket is subjected to micro-arc oxidation and rust-proof treatment, and the abrasion resistance of the bracket is further improved.

Description

Technical field [0001] The invention relates to a corrosion-resistant bracket, which belongs to the technical field of alloy materials. Background technique [0002] At present, as people pay more and more attention to energy and the environment, magnesium and magnesium alloys known as "green metals" are receiving unprecedented attention, and because of their high strength, high rigidity, light weight, sound insulation and shock absorption, etc. , Has become the world's recognized best material to replace aluminum, and has extremely wide and important applications in aerospace, military industry, automobiles, communications, electronics, medicine, etc. Benefiting from its resource advantages, my country's magnesium metal has a pivotal position in the world. Since 1999, the output of magnesium metal in my country has been ranked first in the world for 10 years. [0003] Magnesium alloys also have the advantages of high specific strength, good processing performance, large energy a...

Claims

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Application Information

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IPC IPC(8): C22C23/02C22C1/04C25D11/30C23C22/07B22F9/04B22F3/18
CPCB22F3/18B22F9/04B22F2009/042B22F2009/043B22F2998/10C22C1/0408C22C23/02C23C22/07C25D11/026C25D11/30B22F2003/248
Inventor 陈思妤李金龙陈斌干勐俊林楠
Owner 宁波晋畅机电科技有限公司
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