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Aluminum alloy corrosion resistance strengthening process combining regression reaging and subzero treatment

A technology of regressive reaging and cryogenic treatment, which is applied in the field of corrosion resistance strengthening combined with regressive reaging and cryogenic treatment of aluminum alloys. It can solve problems such as the lack of cryogenic treatment processes for aluminum alloys, and improve mechanical properties, corrosion resistance, and treatment quality. Good, simple operation effect

Active Publication Date: 2021-08-27
明达铝业科技(太仓)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of the lack of cryogenic treatment process of aluminum alloy in the prior art, the present invention provides a corrosion resistance strengthening method combining regressive reaging and cryogenic treatment of aluminum alloy, aiming at changing the heating process of regressive reaging through cryogenic treatment, affecting the alloy The Size, Quantity and Distribution of the Precipitated Phases at the Mesograin Boundary Improve the Corrosion Resistance of the Alloy

Method used

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  • Aluminum alloy corrosion resistance strengthening process combining regression reaging and subzero treatment
  • Aluminum alloy corrosion resistance strengthening process combining regression reaging and subzero treatment
  • Aluminum alloy corrosion resistance strengthening process combining regression reaging and subzero treatment

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Effect test

Embodiment 1

[0057]Step 1. Polish the aluminum alloy workpiece with a thickness of 0.5mm to a metallic luster with No. 2000 sandpaper, polish it with 1000-8000 mesh polishing paste, and place it on the workbench;

[0058] Step 2. Heat up the box-type resistance furnace to 450°C. After the temperature is stable, put the 7xxx series aluminum alloy into the furnace, and perform solid solution treatment on the aluminum alloy. The solid solution treatment time is 1 hour, and the furnace temperature is monitored by a potentiometer. The error of the furnace temperature is controlled within ±2°C; for quenching treatment, use deionized water at a temperature of 0-5°C, and the transfer time is within 2s;

[0059] Step 3. Put it into a digital display blast drying oven for aging treatment, and keep it warm for 12 hours at 120°C;

[0060] Step 4. Put it into a digital display blast drying oven for aging treatment, and keep it warm at 180°C for 8 minutes;

[0061] Step 5. Put it into a digital display...

Embodiment 2

[0064] Step 1. Polish the aluminum alloy workpiece with a thickness of 0.5mm to a metallic luster with No. 2000 sandpaper, polish it with 1000-8000 mesh polishing paste, and place it on the workbench;

[0065] Step 2, subject the alloy to cryogenic treatment, put it into liquid nitrogen, and keep it at -196°C for 10h;

[0066] Step 3. Heat up the box-type resistance furnace to 450°C. After the temperature is stable, put the 7xxx series aluminum alloy into the furnace, and perform solid solution treatment on the aluminum alloy. The solid solution treatment time is 1 hour, and the furnace temperature is monitored by a potentiometer. The error of the furnace temperature is controlled within ±2°C; for quenching treatment, use deionized water at a temperature of 0-5°C, and the transfer time is within 2s;

[0067] Step 4. Put it into a digital display blast drying oven for aging treatment, and keep it warm at 100°C for 16 hours;

[0068] Step 5. Put it into a digital display blast ...

Embodiment 3

[0072] Step 1. Polish the aluminum alloy workpiece with a thickness of 0.5mm to a metallic luster with No. 2000 sandpaper, polish it with 1000-8000 mesh polishing paste, and place it on the workbench;

[0073] Step 2. Heat up the box-type resistance furnace to 470°C. After the temperature is stable, put the 7-series aluminum alloy into the furnace, and perform solution treatment on the aluminum alloy. The solution treatment time is 2 hours, and the furnace temperature is monitored by a potentiometer. The error of the furnace temperature is controlled within ±2°C; for quenching treatment, use deionized water at a temperature of 0-5°C, and the transfer time is within 2s;

[0074] Step 3, subject the alloy to cryogenic treatment, put it into liquid nitrogen, and keep it at -196°C for 10h;

[0075] Step 4. Put it into a digital display blast drying oven for aging treatment, and keep it warm for 12 hours at 120°C;

[0076] Step 5. Put it into a digital display blast drying oven fo...

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Abstract

The invention belongs to the field of aluminum alloy heat treatment, particularly relates to an aluminum alloy corrosion resistance strengthening method combining regression reaging and subzero treatment. In subzero treatment, liquid nitrogen is used as a medium, and the temperature is kept at the temperature of -196 DEG C for 10-16 h. Subzero treatment is applied to different steps of solid solution and aging, the number, sizes and distribution of grain boundary precipitated phases are changed, and then the electrochemical corrosion mode of an alloy is changed. Subzero treatment is adopted after regression treatment, discontinuous grain boundary precipitates show a good distribution state, and corrosion resistance can be improved easily.

Description

technical field [0001] The invention belongs to the field of heat treatment of aluminum alloys, and relates to a method for strengthening corrosion resistance of aluminum alloys by combining regressive reaging and cryogenic treatment. Background technique [0002] As a representative of high-strength aluminum alloys, 7xxx aluminum alloys are more and more widely used because of their excellent performance. The performance of this type of aluminum alloy is sensitive to the microstructure and is affected by the nucleation, growth and distribution of precipitated phases in the alloy. The traditional heat treatment process is solution treatment and aging treatment. Regression re-aging treatment has been proved to be a heat treatment process that can improve the corrosion resistance of the alloy, but the single aging treatment will cause the mechanical properties of the alloy to be lost. Compared with T6 Dealing with partial loss. Cryogenic treatment can modify the aluminum all...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/053C22C21/10
CPCC22F1/002C22F1/053C22C21/10
Inventor 苏睿明马思怡曲迎东李广龙王楷甯杨玉萍王磊
Owner 明达铝业科技(太仓)有限公司
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