Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Process for optimizing cold rolling reduction in machining process of Zn-containing and Er-containing high-Mg aluminum alloy plate resistant to long-term corrosion

A technology of aluminum alloy plate and cold rolling deformation, which is applied in the field of non-ferrous metals, can solve the problems of reducing the service life of materials, stress corrosion, and aluminum alloys cannot be strengthened by heat treatment, etc., and achieve the effect of improving service life and high long-term corrosion resistance

Active Publication Date: 2014-07-16
BEIJING UNIV OF TECH
View PDF6 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This series of aluminum alloys cannot be strengthened by heat treatment, and the strength is mainly increased by solid solution strengthening and strain strengthening of Mg atoms. However, when the Mg content exceeds 3.5wt.%, the alloy will lose its 2 Al 3 ) is easy to continuously precipitate along the grain boundary to form an intergranular network, causing severe intergranular corrosion and stress corrosion, thereby reducing the service life of the material

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Process for optimizing cold rolling reduction in machining process of Zn-containing and Er-containing high-Mg aluminum alloy plate resistant to long-term corrosion
  • Process for optimizing cold rolling reduction in machining process of Zn-containing and Er-containing high-Mg aluminum alloy plate resistant to long-term corrosion
  • Process for optimizing cold rolling reduction in machining process of Zn-containing and Er-containing high-Mg aluminum alloy plate resistant to long-term corrosion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Step 1) Same as Comparative Example 1.

[0034] 2) Cold rolling the Zn, Er and high Mg aluminum alloy obtained in step 1), the cold deformation is 55%±2% (due to the unevenness of rolling, there is a 2% error in the deformation).

[0035] 3) The cold-rolled sheet obtained in step 2) is annealed at 240° C. for different times. According to the American Society for Testing and Materials standard AST G67, the nitric acid weight loss test was carried out on the alloy cold-rolled and different annealed samples, and the intergranular corrosion susceptibility of the material was evaluated by the weight loss per unit area of ​​the alloy before and after immersion. The change curve of weight loss per unit area with annealing time is as follows: Figure 5 shown.

[0036] Depend on Figure 1-Figure 5 It can be seen that after annealing at 240 °C for each deformation alloy, the weight loss per unit area first increases and then decreases with the prolongation of the annealing ti...

Embodiment 2

[0038] 1) The cold-rolled sheets obtained in step 2) of Comparative Example 1, Comparative Example 2, Comparative Example 3, Comparative Example 4 and Example 1 were annealed at 240° C. for 2 hours and then air-cooled. The exfoliation corrosion test was carried out on the annealed sample according to ASTM G66-99 standard of the American Society for Testing and Materials, and the exfoliation corrosion resistance grade of the material was evaluated by the corrosion morphology of the alloy after immersion. The exfoliation corrosion morphology of the annealed state at 240℃ / 2h for each deformation is as follows Image 6 shown.

[0039] Depend on Image 6It can be seen that the alloys with different deformation amounts in this state are corroded to different degrees, and a large number of corrosion pits are formed on the surface of the alloy with a deformation amount of 70%±2%, and the corrosion pits have slightly penetrated into the surface of the sample (at the arrow), and the al...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a process for optimizing cold rolling reduction in the machining process of a Zn-containing and Er-containing high-Mg aluminum alloy plate resistant to long-term corrosion, and belongs to the technical field of non-ferrous metals. The Zn-containing and Er-containing high-Mg aluminum alloy plate comprises the following components in percentage by mass: 5.3-6.3 percent of Mg, 0.4-0.8 percent of Zn, 0.4-0.8 percent of Mn, 0.15-0.3 percent of Er, 0.15-0.25 percent of Zr, less than 0.4 percent of inevitable impurities and the balance of Al. A hot-rolled plate is subjected to hot-rolling, intermediate annealing and cold rolling in sequence, and the final cold reduction is 33-72 percent; the plate is annealed at different time at 240 DEG C to be subjected to nitric acid weightlessness test, exfoliation corrosion test is carried out in an annealing state at 240 DEG C for 2 hours, and the optimal reduction under the resistance to long-term corrosion is 55+ / -2 percent. By adopting the process, the reduction of the Zn-containing and Er-containing high-Mg aluminum alloy plate resistant to long-term corrosion is optimized. Through the reduction, the alloy has high long-term corrosion resistance as well as high strength.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metals, and in particular relates to a deformation optimization process for improving the long-term corrosion resistance of Zn, Er and high-Mg aluminum alloy plates. The process optimizes the alloy to have both long-term corrosion resistance and strength Excellent deformation. Background technique [0002] Al-Mg alloys are widely used in automotive, aerospace and other fields due to their excellent properties. This series of aluminum alloys cannot be strengthened by heat treatment, and the strength is mainly increased by solid solution strengthening and strain strengthening of Mg atoms. However, when the Mg content exceeds 3.5wt.%, the alloy will lose its 2 Al 3 ) is easy to continuously precipitate along the grain boundary to form an intergranular network, causing severe intergranular corrosion and stress corrosion, thereby reducing the service life of the material. In addition, strain str...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/047C22C21/06
Inventor 高坤元戴小伟聂祚仁文胜平黄晖张义
Owner BEIJING UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com