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Electrochemical corrosion-resistant reinforced Al-Zr-Er alloy material and preparation method thereof

An alloy material, electrochemical technology, applied in the field of metal alloys, can solve problems such as poor corrosion resistance

Active Publication Date: 2013-07-03
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of poor corrosion resistance of existing high-strength aluminum alloys, and to find an aluminum alloy material that can strengthen the aluminum or aluminum alloy matrix and improve the corrosion resistance of aluminum alloys and its preparation method

Method used

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  • Electrochemical corrosion-resistant reinforced Al-Zr-Er alloy material and preparation method thereof
  • Electrochemical corrosion-resistant reinforced Al-Zr-Er alloy material and preparation method thereof
  • Electrochemical corrosion-resistant reinforced Al-Zr-Er alloy material and preparation method thereof

Examples

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Effect test

example 1

[0018] Example 1: (1) Alloy castings were prepared by graphite crucible melting and iron mold casting. The raw materials used were pure aluminum and Al-6Er and Al-4Zr intermediate alloys. The melting temperature was 750-780 ° C. After reaching the melting temperature, keep it warm for 30 minutes , cast with an iron mold, and then directly cold-rolled. The cold-rolling process preferably controls the reduction of each pass at 10% to 25%, and the final cold deformation is 75% to 90%. Alloys with 5 different compositions were prepared, and their actual compositions were tested by XRF, as shown in Table 1 below. The S1 and S2 samples are Al-Er and Al-Zr binary alloys, respectively, for comparison.

[0019] Table 1 Experimental alloy composition

[0020]

[0021]

[0022] The alloy in step (1) is then subjected to solution treatment at 640° C. for 20 to 30 hours, and then water quenched to room temperature. Then anneal at intervals of 25°C for 3 hours between 200°C and 500°...

example 2

[0023] Example 2: For samples S3-S6 in step (1) of Example 1, solid solution at 640°C for 24 hours, water quenching to room temperature, and then isothermal aging at 375°C. figure 2 The hardness change curves of isothermal aging are given. The hardness peaks of samples S3, S4, S5, and S6 after aging for 96 hours are 40.6HV, 41.2HV, 40.9HV, and 40.1HV, respectively, and all have significant aging strengthening effects .

example 3

[0024] Example 3: For sample S3 in step (1) of Example 1, solid solution at 640°C for 24 hours, water quenching to room temperature, and then carry out isothermal aging at 375°C, keep warm for 10h, 100h, 200h, and then perform electrochemical corrosion resistance respectively Performance repeatability testing. The device used is a standard three-electrode system, the platinum electrode is used as the auxiliary electrode, the saturated calomel electrode is used as the reference electrode, and is connected by a saturated potassium chloride salt bridge, and the electrolyte solution is 3.5wt.%NaCl. Usually the corrosion potential E corr The magnitude of the thermodynamic driving force for corrosion of the alloy is judged, and the corrosion rate of the alloy is judged by the average corrosion current density i in the passivation zone. Corrosion potential E corr The more negative the corrosion is, the higher the average corrosion current density i is, the faster the corrosion rate...

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Abstract

The invention discloses an electrochemical corrosion-resistant reinforced Al-Zr-Er alloy material and a preparation method thereof, and belongs to the technical field of metal alloy. According to the invention, an aluminum matrix comprises the following constituents by weight percent: 0.21-0.29 percent of zirconium and 0.06-0.26 percent of erbium. The preparation method comprises the following steps: adding the AlEr-AlZr intermediate alloy during the aluminium smelting process at the temperature of 750-780 DEG C; casting with an iron die, and allowing ingoting to be subjected to homogenizing processing, rolling and solution treatment; and finally, allowing the quenched alloy to be subjected to isochronal aging heat treatment at the temperature between 200-500 DEG C at intervals of 25 DEG C and to be subjected to isothermal aging heat treatment at the temperature of 375+ / -10 DEG C. According to the invention, the alloy is greatly improved in strength due to aging heat treatment, and is improved in electrochemical corrosion resistance at the same time, and is different from the phenomenon that a current aluminum alloy is worse in corrosion resistance after being reinforced through heat treatment.

Description

technical field [0001] The invention relates to an electrochemical corrosion-resistant and strengthened micro-alloyed aluminum alloy material, which belongs to the technical field of metal alloys. Background technique [0002] Due to the advantages of low density, high specific strength, easy processing and corrosion resistance, aluminum-based alloys are widely used in aerospace, transportation and other fields. From the perspective of alloy composition, there are generally two ways to strengthen aluminum alloys: solid solution strengthening and precipitation strengthening. The aluminum alloy obtained by solid solution strengthening is only suitable for the low-strength or medium-strength range, but its good corrosion resistance makes up for the defects of low strength; high-strength aluminum alloys are often obtained by precipitation strengthening, but The potential difference between the precipitated phase and the aluminum matrix will destroy the electrochemical uniformit...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22F1/04
Inventor 高坤元刘丹聂祚仁文胜平黄晖
Owner BEIJING UNIV OF TECH
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