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Accelerated test method for simulating atmospheric corrosion of aluminum alloy in coastal ventilation room

A technique for atmospheric corrosion and accelerated testing, used in weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc.

Inactive Publication Date: 2019-03-01
AIR FORCE UNIV PLA
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  • Abstract
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  • Application Information

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Problems solved by technology

However, there is no literature on how to specifically monitor the corrosive medium (NO 2 , SO 2 etc.) The scientific and reasonable concentration is equivalent to the concentration of the corrosive medium in the corrosive solution

Method used

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  • Accelerated test method for simulating atmospheric corrosion of aluminum alloy in coastal ventilation room
  • Accelerated test method for simulating atmospheric corrosion of aluminum alloy in coastal ventilation room
  • Accelerated test method for simulating atmospheric corrosion of aluminum alloy in coastal ventilation room

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Embodiment Construction

[0040] In order to make the above-mentioned technical solution of the present invention more obvious and easy to understand, the present invention will be described in detail below by taking the example of simulating the atmospheric corrosion of aluminum alloy in a ventilation room in the coastal environment of Wanning, Hainan, China.

[0041] 1. Making test pieces

[0042] The material of the test piece is 2A12-T4 aluminum alloy, and the material composition is shown in Table 1.

[0043] Table 1 Chemical composition of test piece materials

[0044]

[0045] The test pieces and the accelerated corrosion test pieces exposed in the ventilation room in the coastal environment of Wanning, Hainan Province are dog-bone-shaped and flat-plate-shaped respectively, as shown in Figure 1(a) and Figure 1(b), the surfaces of these two test pieces are not Contains an aluminum clad layer.

[0046] For the test pieces exposed in the ventilated room in the coastal environment of Wanning, H...

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Abstract

The invention discloses an accelerated test method for simulating atmospheric corrosion of aluminum alloy in a coastal ventilation room. The method comprises the following steps: calculating equivalent concentration of a corrosive medium in a corrosive solution, preparing the corrosive solution and carrying out a laboratory accelerated simulation test, wherein calculation of the equivalent concentration of the corrosive medium in the corrosive solution specifically includes the following steps: (a) calculating solubility of local atmospheric pollutants SO2 and NO2 in water; (b) calculating theconcentration of H2SO4 and HNO3 in the solubility equilibrium state of the SO2 and the NO2 at the same equivalent of H+ concentration; (c) treating the concentration of NaCl as the mass concentrationof NaCl in seawater and weighing the concentration of the H2SO4 and the HNO3 in equal proportion. The method has the advantages of being capable of not only accurately simulating the corrosion characteristics of the aluminum alloy in the coastal ventilation room, but also completely meeting the two principles of the same corrosion damage mode and the consistent corrosion damage mechanism, and better reproducing the basic characteristics of the atmospheric corrosion.

Description

technical field [0001] The invention relates to an accelerated test method, in particular to an accelerated test method for simulating atmospheric corrosion of an aluminum alloy in a coastal ventilation room. Background technique [0002] Aluminum alloy materials are widely used in important structures such as beams, stringers, bulkheads, and skins of aircraft. Corrosion of these aluminum alloy structures of aircraft becomes more and more of a problem as the aircraft ages in service, especially in coastal environments. For the corrosion problem of the exterior (surface) of the aircraft, it can be found and dealt with in a timely manner through daily maintenance, but it is difficult to find the corrosion problem of the aluminum alloy structure inside the aircraft through daily maintenance, so the corrosion problem of the aluminum alloy structure inside the aircraft Serious threat to flight safety. In order to ensure flight safety, it is necessary to scientifically and reaso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00
CPCG01N17/006
Inventor 何宇廷张胜张腾崔荣洪伍黎明安涛冯宇杜旭马斌鳞张天宇
Owner AIR FORCE UNIV PLA
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