Denudation rapid testing method for simulating high-strength aluminum alloy in ocean atmospheric environment
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A marine atmosphere, accelerated test technology, applied in the direction of weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc. problems, to achieve the effect of a wide range of applications
Inactive Publication Date: 2014-07-02
CHINA UNIV OF PETROLEUM (EAST CHINA)
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[0007] Although the EXCO full immersion test and the salt spray test have certain applications in the development of new materials, neither of them can predict the exfoliation corrosion results well. The correlation between these two accelerated test methods and field exposure results is not great. The simulation and reproducibility are relatively poor
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Embodiment 1
[0037] An accelerated exfoliation corrosion test method simulating a high-strength aluminum alloy in a marine atmosphere environment, comprising the following steps:
[0038] Step 1. Prepare an aqueous NaCl solution with a mass fraction of 0.8 mol / L as an electrolyte solution, immerse the above-mentioned pretreated sample in the electrolyte solution for constant current prepolarization, and the current density is 0.83mV / cm 2 , and the polarization time is respectively selected as 2 hours, 4 hours, 6 hours, and 8 hours, such as figure 1 As shown, the variation curve of the maximum intergranular corrosion depth with the polarization time after constant current polarization is obtained; the sample polarized for 4 hours is preferred for use;
[0039] Step 2. Establish a constant environment with relative humidity and temperature by the saturated salt solution humidity method and water bath method. The temperature and relative humidity are shown in Table 3. The temperature is 30°C,...
Embodiment 2
[0050] An accelerated exfoliation corrosion test method simulating a high-strength aluminum alloy in a marine atmosphere environment, comprising the following steps:
[0051] Step 1. Prepare a NaCl aqueous solution with a mass fraction of 0.8 mol / L as an electrolyte solution, immerse the above-mentioned pretreated sample in the electrolyte solution for constant current prepolarization, the current density is 0.83mV / cm2, and polarize for 4 hours , to obtain the polarized sample;
[0052] Step 2. Establish a constant environment with relative humidity and temperature by the saturated salt solution humidity method and water bath method. The temperature and relative humidity are shown in Table 3. The temperature is 30°C, and the relative humidity is 75%, 84% and 92% respectively ;
[0053] table 3
[0054]
[0055] Step 3, preparing a NaCl solution with a molar concentration of 0.08mol / L as an impregnating solution;
[0056] Step 4. Place the polarized sample in the above st...
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Abstract
The invention discloses a denudation rapid testing method for simulating a high-strength aluminum alloy in an ocean atmospheric environment and belongs to the technical field of simulation of exfoliation corrosion of the high-strength aluminum alloy. The denudation rapid testing method comprises the following steps: pre-treating a test sample; putting the pre-treated test sample into an electrolyte solution to carry out constant-current pre-polarization; after the polarization, carrying out ultrasonic cleaning; putting the test sample subjected to the ultrasonic cleaning into an immersion solution and immersing for a period of time; then putting the test sample into the environment with relative humidity and temperature and carrying out an analysis on the exfoliation corrosion depth; selecting constant-current polarization time, the content of NaCl in the immersion solution, the constant temperature and the relative humidity to simulate an exfoliation corrosion process of the high-strength aluminum alloy in the ocean atmospheric environment, and researching exfoliation corrosion laws and mechanisms of the high-strength aluminum alloy under the effects of different ocean atmospheric environment factors. The method disclosed by the invention can be used for researching exfoliation corrosion behaviors and laws of the high-strength aluminum alloy under the effects of the different ocean atmospheric environment factors.
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 a marine atmospheric environment. Background technique [0002] High-strength aluminum alloy has the characteristics of high specific strength, fracture toughness and excellent processing performance. It is widely used in the vehicle and shipbuilding industries, especially as an indispensable structural material in the aviation and aerospace fields. However, the 2024 high-strength aluminum alloy was denuded after being exposed for 6 years and 10 years respectively in Wanning and Qionghai, which are the marine and atmospheric environments of our country. After the denudation, the mechanical properties of the material dropped sharply, which directly affected its service life and service safety. Long-term on-sit...
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