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Processing method for improving corrosion resistance of Mg-Y-Nd based alloy

A treatment method and a technology of base alloys, which are applied in the field of treatment to improve the corrosion resistance of Mg-Y-Nd base alloys, can solve problems such as cumbersome process flow, and achieve strong operability, simple and easy-to-master methods, and a wide range of applications Effect

Active Publication Date: 2018-01-12
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current research on the cryogenic treatment process is all about magnesium-aluminum alloys. For the rare earth magnesium alloys with better properties, especially the representative Mg-Y-Nd alloys, the current research is still blank.
Moreover, the existing cryogenic treatment processes are all gradient cooling, and the process flow is relatively cumbersome.

Method used

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  • Processing method for improving corrosion resistance of Mg-Y-Nd based alloy
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  • Processing method for improving corrosion resistance of Mg-Y-Nd based alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0037]The preparation of Mg-Y-Nd alloy is according to the conventional preparation method, and industrial pure magnesium, industrial pure neodymium, industrial pure yttrium are smelted as raw materials; the sample is cut from the smelted magnesium alloy ingot. Select a representative part of the ingot to cut a magnesium alloy test piece with a size of 50×50×5mm for the corrosion weight loss rate test; cut a magnesium alloy test piece with a size of 10×10×10mm for the electrochemical corrosion performance test; According to the national standard GB / T 228.1-2010, the tensile specimens with mechanical properties at room temperature are cut and processed to meet the standards. The mass percent composition of the components in the obtained Mg-Y-Nd alloy: 7.11wt.% Y, 1.52wt.% Nd, impurity elements Al<0.01wt.%, Fe<0.01wt.%, Cu<0.01wt.%, Ni <0.01wt.%, the rest is Mg. The alloy was rolled at 450°C.

[0038] Cryogenic treatment and conventional treatment of the above obtained Mg-Y-Nd...

Embodiment 2

[0050] Cast Mg-5Y-1Nd

[0051] The as-cast Mg-5Y-1Nd alloy is prepared in a conventional way, and then the as-cast Mg-5Y-1Nd alloy is solid solution treated at a solution temperature of 515°C and kept for 16 hours; after solid solution, the alloy is immediately taken out and placed in liquid nitrogen Quenching in the environment, keeping deep cooling for 8h; then, heating to 200°C for aging treatment, the aging time is 12h; after aging, immediately take out the alloy and place it in a liquid nitrogen environment for quenching, keeping deep cooling for 6h (see Figure 6 ).

[0052] Depend on Figure 6 Visible, wherein (a) is cryogenic treatment Mg-5Y-1Nd alloy microstructural structure, (b) is routine processing Mg-5Y-1Nd alloy microstructural structure, can be seen through the alloy after cryogenic treatment of the present invention by two alloy microstructural structures The structure is better, and the precipitated phase is evenly distributed.

[0053] Carry out room temp...

Embodiment 3

[0057] Deformed Mg-7Y-1.5Nd-2Zn-0.5Zr

[0058] The deformed Mg-7Y-1.5Nd-2Zn-0.5Zr alloy is prepared in a conventional manner, and then the deformed Mg-7Y-1.5Nd-2Zn-0.5Zr alloy is solid solution treated at a solution temperature of 535°C and kept for 20 hours; After melting, the alloy is immediately taken out and placed in a liquid nitrogen environment for quenching, and kept in deep cooling for 12 hours; then, it is heated to 250°C for aging treatment, and the aging time is 12 hours; after aging, the alloy is immediately taken out and placed in a liquid nitrogen environment for quenching , kept in deep cold for 6h (see Figure 9 ). Depend on Figure 9 It can be seen that (a) is the microstructure of cryogenically treated Mg-7Y-1.5Nd-2Zn-0.5Zr alloy, and (b) is the microstructure of conventionally treated Mg-7Y-1.5Nd-2Zn-0.5Zr alloy. The structure of the alloy shows that the structure of the alloy after the cryogenic treatment of the present invention is better, and the prec...

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Abstract

The invention belongs to the technical field of metal material thermal treatment and particularly relates to a processing method for improving corrosion resistance of an Mg-Y-Nd based alloy. The method comprises the steps that the to-be-processed alloy is subjected to deep cooling and solid solution treatment, soaked in a liquid nitrogen environment for quenching after being treated, and placed inthe liquid nitrogen environment after being quenched; and then the alloy is subjected to deep cooling aging treatment again, soaked in the liquid nitrogen environment for quenching after being treated, and placed in the liquid nitrogen environment after being quenched, the sample is completely stabilized at the liquid nitrogen temperature of minus 196 DEG C, and thus the magnesium alloy with thecorrosion resistance improved is obtained. By adoption of the method, the corrosion resistance of the Mg-Y-Nd based alloy can be remarkably improved while the excellent mechanical performance is ensured. The application range of the Mg-Y-Nd based alloy treated by the deep cooling treatment process is broad.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of metal materials, in particular to a treatment method for improving the corrosion resistance of Mg-Y-Nd based alloys. Background technique [0002] As the lightest metal structural material, magnesium alloy has the advantages of high specific strength and specific stiffness, good damping and shock absorption, etc. It has important application value and broad market prospects in 3CD electronic products, automobile transportation and other fields. The rare earth magnesium alloy has excellent mechanical properties and ductility, which can meet the requirements of structural parts in harsh service environments. Among them, the most representative rare earth magnesium alloy is Mg-Y-Nd alloy. [0003] The application of magnesium alloys in various environments will inevitably cause corrosion problems. Because the chemical properties of magnesium are very active, a loose and porous MgO film ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06
Inventor 蒋全通郑萌张杰段继周侯保荣
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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