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Test method for simulating corrosion process of aluminum and aluminum alloy in industrially polluted atmospheric environment

A technology that pollutes the atmosphere and corrodes the environment. It is used in weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc. It can solve the problems of difficult control of environmental factors, long experimental period and high cost.

Inactive Publication Date: 2011-07-20
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The purpose of the present invention is to provide a simulation, acceleration and reproducibility test method for simulating the corrosion process of aluminum and aluminum alloys in industrially polluted atmospheric environments, to solve the problems of long test periods, high costs, and problems in traditional atmospheric exposure tests. Environmental factors are difficult to control and other issues

Method used

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  • Test method for simulating corrosion process of aluminum and aluminum alloy in industrially polluted atmospheric environment
  • Test method for simulating corrosion process of aluminum and aluminum alloy in industrially polluted atmospheric environment
  • Test method for simulating corrosion process of aluminum and aluminum alloy in industrially polluted atmospheric environment

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Embodiment 1

[0025] The test materials are the above-mentioned LC4 aluminum alloy with aluminum clad layer and the aluminum clad layer removed. The impregnation solution is 0.02mol / LNaHSO 3 , used to simulate Shenyang industrial pollution atmosphere environment. Cycle once every 15 minutes in the order of "dipping → drying → wetting", among which: dipping at 40°C for 2 minutes; drying at 50°C for 11 minutes; wet at 40°C for 2 minutes; the test time is 240 hours. For the relationship between corrosion weight loss and test time, see figure 1 , the corrosion of the LC4 aluminum alloy with and without the aluminum clad layer shows that the corrosion weight loss increases with the prolongation of the test time. Under the same corrosion medium conditions, the corrosion weight loss of the LC4 aluminum alloy with the aluminum clad layer removed Significantly greater than the corrosion weight loss of LC4 aluminum alloy with aluminum clad layer. This shows that the aluminum-clad layer on the surf...

Embodiment 2

[0031] The test materials are the above-mentioned LC4 aluminum alloy with aluminum clad layer and the aluminum clad layer removed. The impregnation solution is 0.02mol / LNaHSO 3 +0.006mol / L NaCl aqueous solution is used to simulate Shenyang's industrially polluted atmospheric environment. Cycle once every 15 minutes in the order of "dipping → drying → wetting", among which: dipping at 40°C for 2 minutes; drying at 50°C for 11 minutes; wet at 40°C for 2 minutes; the test time is 240 hours. For the relationship between corrosion weight loss and test time, see figure 1 , the corrosion of the LC4 aluminum alloy with and without the aluminum clad layer shows that the corrosion weight loss increases with the prolongation of the test time. Under the same corrosion medium conditions, the corrosion weight loss of the LC4 aluminum alloy with the aluminum clad layer removed Significantly greater than the corrosion weight loss of LC4 aluminum alloy with aluminum-clad layer, compared with...

Embodiment 3

[0037] The test materials are the above-mentioned LY12 aluminum alloy with cladding and aluminum cladding removed. The soaking solution is 0.02mol / L NaHSO 3 Aqueous solution and 0.02mol / L NaHSO 3 +0.006mol / L NaCl aqueous solution, used to simulate industrial pollution atmosphere environment. Cycle once every 15 minutes in the order of "dipping → drying → wetting", among which: dipping at 40°C for 2 minutes; drying at 50°C for 11 minutes; wet at 40°C for 2 minutes; the test time is 240 hours.

[0038] image 3 The LY12 aluminum alloy with and without the aluminum clad layer is given in two corrosion media st : 0.02mol / L NaHSO 3 ,2 nd : 0.02mol / L NaHSO 3 The relationship between the corrosion weight loss in +0.006mol / L NaCl and the test time. The relationship between the corrosion weight loss and the test time of the LY12 aluminum alloy with and without the aluminum clad layer in the two corrosive media is linear, but the corrosion of the LY12 aluminum alloy with the alum...

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Abstract

The invention relates to aluminum and aluminum alloy atmospheric corrosion simulation technique, in particular to a test method for simulating the corrosion process of aluminum and aluminum alloy in an industrially polluted atmospheric environment. In the method, aluminum or aluminum alloy is used as a tested material; aqueous solution containing NaHSO3 at a concentration of 0.02mol / L and NaCl at a concentration of 0 to 0.006mol / L is used as corrosive liquid; and soaking, drying and wetting are carried out in turn and are circulated every 10 to 20 minutes, wherein soaking is performed at 45 to 50 DEG C for 1 to 2 minutes, drying is performed at 50 to 60 DEG C for 8 to 15 minutes, wetting is performed at 40 to 50 DEG C for 1 to 3 minutes, and the test time is 48 to 240 hours. The method has simulating performance, accelerating performance and repeatability, can be used in study on the corrosion behaviors of the aluminum and aluminum alloy in the industrially polluted atmospheric environment to evaluate and predict the atmospheric corrosion of the aluminum and aluminum alloy quickly, and can solve the problems of long test period, high cost, difficult environmental factor control and the like of the conventional atmospheric exposure test.

Description

technical field [0001] The invention relates to an atmospheric corrosion simulation technology for aluminum and aluminum alloys, in particular to a test method for simulating the corrosion process of aluminum or aluminum alloys in an industrially polluted atmospheric environment. Background technique [0002] Aluminum and aluminum alloys have excellent properties and are widely used in transportation, energy, food, electronics and other fields, especially in the aviation industry. Most aluminum and aluminum alloys have good atmospheric corrosion resistance, and can usually be used for a long time without protection, and will not cause structural failure due to pitting corrosion, etc., but in highly corrosive industrial atmospheres and marine atmospheres The corrosion problem of aluminum alloy is still relatively prominent. Aluminum alloy LY12 and aluminum alloy LC4 (corresponding to AA2024 and AA7075) are two widely used heat-treatable deformed aluminum alloys. In order to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00
Inventor 王振尧汪川魏伟谢陈平韩薇马腾
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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