Method for simulating erosion acceleration test of high-strength aluminum alloys in industrial atmosphere environments

An accelerated test, aluminum alloy technology, applied in the direction of weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., can solve the problems of little correlation, inaccurate results, difficult to evaluate the effect, etc., and achieve the effect of wide application range

Inactive Publication Date: 2014-07-23
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Application Information

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Problems solved by technology

But it also has many insurmountable shortcomings: First, the test period is long, and long-term exposure experiments generally exceed 20 years, which makes it difficult to quickly evaluate the corrosion resistance of materials; second, atmospheric corrosion is characterized by complexity and diversity , is generally the result of a combination of multiple environmental factors, so it is difficult to assess the role played by each variable
[0008] The above two types of methods both use the visual method to qualitatively evaluate the degree of exfoliation corrosion, so as to determine the exfoliation corrosion sensitivity of the material, which is somewhat subjective and the results are not accurate enough; and because the EXCO full immersion test and salt spray test cannot truly simulate the real atmosphere The exfoliation corrosion of high-strength aluminum alloys in the environment cannot predict the exfoliation corrosion results of outdoor field exposure experiments well. The correlation between these two accelerated test methods and field exposure results is not great, and their simulation and reproducibility are relatively poor.
In addition, these two methods cannot be used to study the kinetics and laws of exfoliation corrosion

Method used

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  • Method for simulating erosion acceleration test of high-strength aluminum alloys in industrial atmosphere environments
  • Method for simulating erosion acceleration test of high-strength aluminum alloys in industrial atmosphere environments
  • Method for simulating erosion acceleration test of high-strength aluminum alloys in industrial atmosphere environments

Examples

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Effect test

Embodiment 1

[0048] An accelerated exfoliation corrosion test method simulating high-strength aluminum alloys in an industrial-marine atmospheric environment, comprising the following steps:

[0049] The first step is to prepare 1mol / L NaCl aqueous solution as the electrolyte solution, and pass the electrolyte solution into figure 2 In the plexiglass fixture shown, then immerse the above-mentioned pretreated sample in the electrolyte solution for constant potential pre-polarization. The constant potential is selected from -570 to -620mV, and polarized for 4 hours to obtain the polarized sample. ;

[0050] In the second step, put the polarized sample in the first step into distilled water for ultrasonic cleaning, and the cleaning time is 3 hours;

[0051] The 3rd step, set up constant environment with relative humidity and temperature by saturated salt solution humidity method and oven method, its temperature, relative humidity are as shown in Table 3,

[0052]

[0053] The fourth ste...

Embodiment 2

[0060] The first step is to prepare 1mol / L NaCl aqueous solution as the electrolyte solution, and pass the electrolyte solution into figure 1 In the plexiglass fixture shown, then immerse the above-mentioned pretreated sample in the electrolyte solution for constant potential pre-polarization. The constant potential is selected from -570 to -620mV, and polarized for 32 hours to obtain the polarized sample. ;

[0061] The second step is to put the polarized sample in the first step into distilled water for ultrasonic cleaning, and the cleaning time is 1 hour;

[0062] The 3rd step, set up constant environment with relative humidity and temperature by saturated salt solution humidity method and oven method, its temperature, relative humidity are as shown in Table 3,

[0063] table 3

[0064]

[0065] The fourth step, respectively prepare 0.6mol / L Na 2 SO 4 Solution and 0.6mol / L NaCl solution, mix the two as the impregnating solution;

[0066] The fifth step is to place ...

Embodiment 3

[0071] The difference from Example 1 is that in the fourth step, 0.15mol / L of Na 2 SO 4 solution and 0.6mol / L NaCl solution, mix the two as the impregnating solution.

[0072] Figure 5 It is the exfoliation corrosion diagram of the side of the sample exposed for 26 days, 33 days, 39 days, 48 ​​days, 55 days, and 61 days in this example. As the exposure time prolongs, the corrosion of the 2024 high-strength aluminum alloy sample becomes more and more serious ; Figure 5 The left side of the middle sample is the constant potential polarization surface. After the accelerated exfoliation corrosion test, the exfoliation corrosion occurred along the left side of the sample from left to right. After 26 days of the test, the elongated grains inside the 2024 high-strength aluminum alloy were caused by corrosion products Al(OH) 3 and Al 2 SO 4 (OH) 4 ·H 2 O was pried up due to the wedge-shaped force. As the test time prolongs, more and more corrosion products are produced, and ...

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Abstract

The invention discloses a method for simulating erosion acceleration test of high-strength aluminum alloys in industrial-marine atmosphere environments, belonging to the technical field of simulation of exfoliation corrosion of high-strength aluminum alloys. The method comprises the following steps: firstly preprocessing samples, putting the preprocessed samples into an electrolyte solution to perform constant-potential pre-polarization, carrying out polarization and then ultrasonically washing the samples, putting the samples washed ultrasonically in a dipping solution to dip for a period of time, subsequently putting the samples in environment with relative humidity and temperature and analyzing exfoliation corrosion depth; selecting polarization time, contents of Na2SO4 and NaCl in the dipping solution, the temperature and the relative humidity and simulating the exfoliation corrosion process of the high-strength aluminum alloys in the industrial-marine atmosphere environments. The method is capable of researching the exfoliation corrosion rules and principles of the high-strength aluminum alloys in the industrial-marine atmosphere environments, good in simulation and capable of speculating the result of outdoor long-term exposure exfoliation corrosion test according to the result of simulation of the acceleration test of the laboratory in short sight.

Description

technical field [0001] The invention belongs to the simulation technical field of exfoliation corrosion of high-strength aluminum alloys, and in particular relates to an accelerated test method for simulating the exfoliation corrosion of high-strength aluminum alloys in an industrial-marine atmospheric environment. Background technique [0002] High-strength aluminum alloy has high specific strength, excellent weldability, and good fracture toughness. It is an ideal light-weight welding structural material for ground armored vehicles, military equipment, and aerospace vehicles. The tendency of exfoliation corrosion is relatively high, and 2024 high-strength aluminum alloy has obvious exfoliation corrosion after 20 years of exposure at the Qingdao test station in my country's industrial-marine atmospheric environment, which will lead to a substantial decrease in the strength and plasticity of the material, thereby reducing the service life of the material . [0003] The outdoo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00
Inventor 孙霜青胡松青李春玲王秀民杜建平
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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