Anti-corrosion wrought magnesium alloy containing rare earth elements and manufacturing method of anti-corrosion wrought magnesium alloy

A technology for deforming magnesium alloys and rare earth elements, which is applied in the field of magnesium alloy production, can solve the problems of magnesium alloys that are not resistant to corrosion and cannot be protected, and achieve the effect of inhibiting nucleation and growth.

Active Publication Date: 2016-06-01
扬州宏福铝业有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When PBR<1, it is generally considered that a non-protective oxide film is formed, which cannot effectively protect the structure inside the film layer, so magnesium alloys are not corrosion resistant

Method used

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  • Anti-corrosion wrought magnesium alloy containing rare earth elements and manufacturing method of anti-corrosion wrought magnesium alloy
  • Anti-corrosion wrought magnesium alloy containing rare earth elements and manufacturing method of anti-corrosion wrought magnesium alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The corrosion-resistant and deformation-resistant magnesium alloy containing rare earth elements in this embodiment has the composition and mass percentage of each component: Al: 8.82%; Zn: 0.77%; Mn: 0.15%; Ce: 1.08%; Gd: 0.32% ; The balance is Mg and unavoidable impurity elements. Among them, magnesium ingot is high-purity magnesium; aluminum is high-purity aluminum; zinc is high-purity zinc; manganese source is aluminum-manganese master alloy containing 10% manganese, cerium is magnesium-cerium master alloy containing 20% ​​cerium, gadolinium is 20% gadolinium magnesium-gadolinium master alloy.

[0039] The composition of No. 5 flux is shown in the table below:

[0040]

[0041]The melting and casting process is as follows: preheat all raw materials and No. 5 flux to 100°C respectively. Add magnesium to an iron crucible preheated to 250°C, and add flux to cover it. After the magnesium is completely melted, when the melt temperature rises to 730°C, add preheated ...

Embodiment 2

[0044] The corrosion-resistant and deformation-resistant magnesium alloy containing rare earth elements in this embodiment has the composition and mass percentage of each component: Al: 8.3%; Zn: 0.5%; Mn: 0.3%; Ce: 1.5%; Y: 0.2% ; The balance is Mg and unavoidable impurity elements.

[0045] The melting and casting process is as follows: preheat all raw materials and No. 5 flux to 80°C, add magnesium to an iron crucible preheated to 200°C, and add No. 5 flux to cover; after the magnesium is completely melted, the melt temperature rises to 740°C At ℃, high-purity aluminum, high-purity zinc, magnesium-cerium master alloy containing 20% ​​cerium, magnesium-yttrium master alloy containing 20% ​​yttrium, and aluminum-manganese master alloy containing 10% manganese were added in batches. The temperature of the melt is not lower than 720°C. After all the additions are completed, stir for 20 minutes, refine with argon, and then stand for 40 minutes; use semi-continuous casting to cas...

Embodiment 3

[0048] The corrosion-resistant and deformation-resistant magnesium alloy containing rare earth elements in this embodiment has the composition and mass percentage of each component: Al: 9.2%; Zn: 0.8%; Mn: 0.1%; La: 0.8%; Gd: 0.6% ; The balance is Mg and unavoidable impurity elements.

[0049] The melting and casting process is as follows: preheat all raw materials and flux to 100°C, add magnesium to an iron crucible preheated to 300°C, and add No. 5 flux to cover; after the magnesium is completely melted, the melt temperature rises to 720°C , adding high-purity aluminum, high-purity zinc, magnesium-lanthanum master alloy containing 20% ​​lanthanum, magnesium-gadolinium master alloy containing 20% ​​gadolinium, and aluminum-manganese master alloy containing 10% manganese in batches. The temperature is not lower than 720°C. After all the addition is completed, stir for 20 minutes, refine with argon, and then stand for 40 minutes; use semi-continuous casting to cast magnesium al...

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Abstract

The invention discloses anti-corrosion wrought magnesium alloy containing rare earth elements and a manufacturing method of the anti-corrosion wrought magnesium alloy and relates to the technical field of magnesium alloy production. The anti-corrosion wrought magnesium alloy includes, by mass percentage, 8.3%-9.2% of Al, 0.5%-0.8% of Zn, 0.1-%-0.3% of Mn, 0.8%-1.5% of LRE, 0.2%-0.6% of HRE and the balance Mg and inevitable impurity elements, wherein the LRE represents the light rare earth elements, and the HRE represents the heavy rare earth elements. A magnesium alloy ingot is manufactured through a semi-continuous casting method, the ingot is turned into a round ingot after being subjected to solution treatment, and then the round ingot is subjected to hot extrusion. The manufactured magnesium alloy is subjected to a 5% NaCl neutral salt spray test at the temperature of 35 DEG C for 100 hours, the corrosion rate is 0.01684 mg/cm<2>/d, and the anti-corrosion wrought magnesium alloy is high-anti-corrosion wrought magnesium alloy with the low rare earth content.

Description

technical field [0001] The invention relates to the technical field of magnesium alloy production. Background technique [0002] AZ80 magnesium alloy is widely used in extrusion and forging production due to its excellent performance and low price, and is currently the most widely used high-strength wrought magnesium alloy. However, due to the strong chemical activity of magnesium, it has a small electronegativity and a relatively negative electrode potential (the electronegativity of magnesium is 1.31, and the standard electrode potential is -2.37V), and it is easy to occur with alloy elements and impurities in the alloy. Galvanic corrosion; at the same time, the Pilling-Bedworth ratio (PBR, that is, the ratio of the molar volume of the oxide to the molar volume of the base metal) of the magnesium oxide film formed on the surface of the magnesium alloy during the corrosion process is 0.81. When PBR<1, it is generally considered that a non-protective oxide film is formed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C22/00C22C1/03C22F1/06
CPCC22C1/03C22C22/00C22F1/06
Inventor 邱鑫孟健尹飞陈联洲吕恒林牛晓东黎智萍孙伟江廷辉
Owner 扬州宏福铝业有限公司
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