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Judging method of exfoliation corrosion level of 5083 aluminum alloy

A judgment method and exfoliation corrosion technology, which is applied in the field of aluminum alloys, can solve problems such as increased exfoliation corrosion sensitivity, and achieve the effect of shortening the judgment cycle

Inactive Publication Date: 2018-06-01
SOUTHWEST ALUMINUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main strengthening method of 5083 aluminum alloy is the solid solution strengthening and work hardening of Mg atoms, but even at room temperature, the β phase of this type of alloy is easy to precipitate from the matrix, which not only softens the properties of the alloy, but also due to the β phase Continuous precipitation along the grain boundary greatly increases its exfoliation corrosion sensitivity

Method used

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  • Judging method of exfoliation corrosion level of 5083 aluminum alloy
  • Judging method of exfoliation corrosion level of 5083 aluminum alloy
  • Judging method of exfoliation corrosion level of 5083 aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Sampling on the 5083 aluminum alloy marine plate sample to obtain the test block;

[0055] Grinding and eroding the longitudinal section of the test block to obtain a sample;

[0056] The grinding method is to go through rough grinding with sandpaper, fine grinding with sandpaper, rough polishing of canvas and fine polishing of woolen cloth;

[0057] The etching reagents include 3mL of HCl, 2mL of HF, 5mL of HNO 3 and 190 mL of H 2 O (that is, No. 6 etchant specified in the national standard GB / T3246.1 "Methods for Microstructure Inspection of Deformed Aluminum and Aluminum Alloy Products Part 1: Microstructure Inspection Method").

[0058] 200 times and 1000 times optical microscope observations were respectively performed on the samples to obtain the microstructure.

[0059] The microstructure that the embodiment of the present invention 1 obtains is as Figure 13 and Figure 14 as shown, Figure 13 It is the 200 times microstructure diagram of the 5083 aluminum...

Embodiment 2

[0063] Obtain the microstructure of the 5083 aluminum alloy marine plate sample of embodiment 2 according to the method of embodiment 1, the result is as follows Figure 16 and 17 as shown, Figure 16 It is the 200 times microstructure diagram of the 5083 aluminum alloy marine plate sample in Example 2 of the present invention; Figure 17 It is a 1000 times microstructure diagram of the 5083 aluminum alloy marine plate sample in Example 2 of the present invention; by observing Figure 16 and Figure 17 , there are obvious continuous corrosion grain boundaries in the microstructure, and the grain structure is fibrous, and the exfoliation corrosion grade should be grade E according to the judging method of the present invention.

[0064] According to the standard of ASTM G66 "the test method of visual assessment of the exfoliation corrosion sensitivity of 5XXX series aluminum alloys", the 5083 aluminum alloy marine plate samples in embodiment 2 are detected, and the detection...

Embodiment 3

[0067] Obtain the microstructure of the 5083 aluminum alloy marine plate sample of embodiment 3 according to the method of embodiment 1, the result is as follows Figure 19 and 20 as shown, Figure 19 It is a 200-fold microstructure diagram of the 5083 aluminum alloy marine plate sample in Example 3 of the present invention; Figure 20 It is a 1000 times microstructure diagram of the 5083 aluminum alloy marine plate sample in Example 3 of the present invention; by observing Figure 19 and Figure 20 , the number of β precipitates on the grain boundary in the microstructure is relatively large, but the distribution is discontinuous and in the form of point chains. According to the determination method of the present invention, the exfoliation corrosion level should be PB level.

[0068] According to the standard of ASTM G66 "the test method of the visual assessment of the exfoliation corrosion sensitivity of 5XXX series aluminum alloy", the 5083 aluminum alloy marine plate s...

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Abstract

The invention provides a judging method of exfoliation corrosion level of 5083 aluminum alloy. The judging method comprises the following steps: collecting 5083 aluminum alloy samples with different corrosion levels; performing microstructure test on the 5083 aluminum alloy samples; establishing the corresponding relationship between the corrosion levels of the 5083 aluminum alloy and microstructure characteristics according to microstructure test results; observing the microstructure of the to-be-tested 5083 alloy, and obtaining the corrosion level of the to-be-tested 5083 alloy according tothe corresponding relationship. Microstructure characteristic spectra corresponding to different exfoliation corrosion levels of the 5083 aluminum alloy are obtained by observation under an optical microscope, and microstructure characteristics of the to-be-tested 5083 aluminum alloy samples are observed and compared with the spectra, and accordingly, the exfoliation corrosion levels of the to-be-tested 5083 alloy samples are judged. With adoption of the provided method, the judging period of the exfoliation corrosion sensitivity levels of the 5083 aluminum alloy is shortened, and the method is quick and convenient.

Description

technical field [0001] The invention relates to the technical field of aluminum alloys, in particular to a method for judging the exfoliation corrosion level of 5083 aluminum alloy. Background technique [0002] The 5-series aluminum alloy is a non-heat-treated strengthened alloy with medium strength, excellent corrosion resistance and weldability. This type of alloy not only has excellent resistance to general corrosion in seawater and marine atmospheric conditions, but also resists exfoliation corrosion. Good performance, 5083 aluminum alloy is a kind of alloy that cannot be strengthened by heat treatment, and has suitable comprehensive properties such as strength, corrosion resistance and processability, so it is more widely used in ships than other 5 series alloys. [0003] Exfoliation corrosion is one of the main corrosion forms of 5083 aluminum alloy, which can cause great damage to the strength and plasticity of aluminum alloy and shorten the service life of aluminum ...

Claims

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Application Information

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IPC IPC(8): G01N21/88
CPCG01N21/8803
Inventor 冯旺温庆红冉进
Owner SOUTHWEST ALUMINUM GRP
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