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Test method for simulating corrosion process of aluminum alloy in salt-rich salt lake in atmospheric environment

A technology of atmospheric environment and corrosion process, applied in the direction of weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., it can solve the problems such as the inability to simulate the atmospheric corrosion behavior of aluminum alloys well, and the accelerated research of aluminum alloy simulation, and achieve the Simulation, rapid evaluation and prediction, reproducible effect

Active Publication Date: 2014-08-06
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There have been some reports on accelerated simulation methods for aluminum alloys, but they are all based on simulating industrial pollution and the atmospheric environment in coastal areas. At present, there is no accelerated simulation research on the corrosion behavior of aluminum alloys in the atmospheric environment of rich salt lakes.
At the same time, it has been verified that various accelerated simulation experiments in the past cannot simulate the atmospheric corrosion behavior of aluminum alloys in the salt lake area very well.

Method used

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Effect test

Embodiment 1

[0032] Aluminum alloy AA2024-T3 is used as the test material, and salt lake water is used as the corrosion medium, and an aerosol generator is used to deposit salt solution droplets on the surface of the sample until the solid deposition amount after evaporation of water on the surface of the sample is 100 μg / cm 2 , deposited on the surface of the sample once every three days; then proceed alternately according to "wet→dry", and cycle every 3 hours, wherein: in each cycle, the temperature of the wetting process is 30°C, and the wetting time is 1 hour (relatively within 1 hour The humidity increases linearly from 20% to 80%); the drying process temperature is 40°C, and the drying time is 2 hours (the relative humidity decreases linearly from 80% to 20% within 2 hours); the test time is 3 days. Corrosion products and pitting pits are evenly dispersed on the surface of the sample. At this time, the pitting pits are small and the corrosion products are not connected to each other (...

Embodiment 2

[0034] Aluminum alloy AA2024-T3 is used as the test material, and salt lake water is used as the corrosion medium, and an aerosol generator is used to deposit salt solution droplets on the surface of the sample until the solid deposition amount after evaporation of water on the surface of the sample is 100 μg / cm 2 , deposited on the surface of the sample once every three days; then proceed alternately according to "wet→dry", and cycle every 3 hours, wherein: in each cycle, the temperature of the wetting process is 30°C, and the wetting time is 1 hour (within 1 hour The relative humidity increases linearly from 20% to 80%); the drying process temperature is 40°C, and the drying time is 2 hours (the relative humidity decreases linearly from 80% to 20% within 2 hours); the test time is 9 days. The surface of the sample is covered with more crack-like corrosion products and pits, the pits become larger, and the interval corrosion products begin to connect together ( image 3 (b))....

Embodiment 3

[0036] Aluminum alloy AA2024-T3 is used as the test material, and salt lake water is used as the corrosion medium, and an aerosol generator is used to deposit salt solution droplets on the surface of the sample until the solid deposition amount after evaporation of water on the surface of the sample is 100 μg / cm 2 , deposited on the surface of the sample once every three days; then proceed alternately according to "wet→dry", and cycle every 3 hours, wherein: in each cycle, the temperature of the wetting process is 30°C, and the wetting time is 1 hour (within 1 hour The relative humidity increases linearly from 20% to 80%); the drying process temperature is 40°C, and the drying time is 2 hours (the relative humidity decreases linearly from 80% to 20% within 2 hours); the test time is 15 days.

[0037] At this time, the corrosion product layer on the surface of the sample is thicker, and the area of ​​the pitting pit is larger ( image 3 (c)). The cross-sectional morphology sho...

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Abstract

The invention discloses a test method for simulating corrosion process of an aluminum alloy in a salt-rich salt lake in an atmospheric environment. According to the method, the aluminum alloy is used as a test material, salt lake water collected on site is used as a corrosion medium, salt solution drops are deposited on a sample surface in virtue of an aerosol generator, deposition is carried out once every three days, and the amount of deposited salt each time is 100 mu g / cm2; wetting and drying are alternately carried out, and a cycle of wetting and drying is carried out every three hours, wherein the temperature during wetting is 30 DEG C, wetting time is 1 h (wherein relative humidity is linearly increased to 80% from 20%), the temperature during drying is 40 DEG C, and drying time is 2 h (wherein relative humidity is linearly decreased to 20% from 80%); test time is 3 to 15 d. Test results obtained in the invention have the characteristics of simulation, acceleration and repeatability, and the method can be used for research on corrosion behaviors of the aluminum alloy in the salt-rich salt lake in the atmospheric environment and can realize rapid evaluation and prediction of atmospheric corrosion of the aluminum alloy.

Description

technical field [0001] The invention relates to an atmospheric corrosion simulation technology for aluminum alloys, in particular to a test method for simulating the corrosion process of aluminum alloys in the atmospheric environment of rich salt lakes. Background technique [0002] Due to its excellent performance, aluminum alloy has been widely used in various outdoor occasions, such as construction, electric power, aerospace and so on. Different atmospheric environments will lead to different corrosion behaviors. In the unpolluted inland atmospheric environment, it has good atmospheric corrosion resistance. In industrial pollution and marine atmospheric environments, due to high relative humidity and pollutant deposition Corrosion will occur. Because of its good corrosion resistance, the overall corrosion of aluminum alloys is not very serious in short-term exposure experiments in most areas of central and eastern my country. [0003] However, in the atmospheric environ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00
Inventor 王振尧王彬彬曹公望柯伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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