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Accelerated test method for simulating atmospheric corrosion of metal materials

A technology of atmospheric corrosion and metal materials, applied in the direction of weather resistance/light resistance/corrosion resistance, analytical materials, measuring devices, etc. Significantly accelerates the effect of corrosion

Inactive Publication Date: 2010-06-16
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this type of method is that there are many factors to be controlled and the operation is difficult

Method used

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  • Accelerated test method for simulating atmospheric corrosion of metal materials
  • Accelerated test method for simulating atmospheric corrosion of metal materials
  • Accelerated test method for simulating atmospheric corrosion of metal materials

Examples

Experimental program
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Effect test

Embodiment 1

[0048] The test materials are the above-mentioned 1050A, 3A21, 7A04. With 1mol / L NaCl+0.05mol / L Na 2 SO 4 +0mol / L Na 2 S 2 O 8 For the dipping solution, cycle according to the order of "dipping→wetting→drying→", in which dipping is at 50°C, wetting is at 50°C, and drying is at 70°C; the cycle time refers to the following conditions: cycle once every 90 minutes, including dipping for 5 minutes; wet for 65 minutes; dry 20 minutes; total experiment time is 24 hours, 48 ​​hours, 72 hours, 96 hours or 120 hours. In order to simulate the atmospheric corrosion process of the three materials, the corrosion weight loss and test time are listed in Table 4, and the relationship curve between corrosion weight loss and test time is shown in figure 2 , the regression analysis of corrosion weight loss and accelerated test time is shown in Table 5. Among the three kinds of aluminum and aluminum alloys, 7A04 has the largest corrosion weight loss, followed by 3A21, and the smallest is 105...

Embodiment 2

[0054] The test materials are 1050A, 3A21, 7A04. With 0.01mol / L NaCl+0.5mol / L Na 2 SO 4 +0.05Na 2 S 2 O 8 For the dipping solution, cycle according to the order of "dipping→wetting→drying→", in which dipping is at 25°C, wetting is at 25°C, and drying is at 40°C; the cycle time refers to the following conditions: cycle once every 150 minutes, including dipping for 10 minutes; wet for 110 minutes; dry 30 minutes; total experiment time is 24 hours, 48 ​​hours, 72 hours, 96 hours or 120 hours. This is used to simulate the atmospheric corrosion process of the three materials. The corrosion weight loss and test time are listed in Table 6. The relationship curve between corrosion weight loss and test time is shown in image 3 , the regression analysis of corrosion weight loss and accelerated test time is shown in Table 7. Among the three aluminum-based aluminum alloys, 7A04 has the largest corrosion weight loss, followed by 3A21, and the smallest is 1050A; the corrosion laws are...

Embodiment 3

[0060] The test materials are 1050A, 3A21, 7A04. With 0.01mol / L NaCl+0.05mol / L Na 2 SO 4 +0.01Na 2 S 2 O 8 For the dipping solution, cycle according to the order of "dipping→wetting→drying→", in which dipping is at 25°C, wetting is at 25°C, and drying is at 50°C; the cycle time refers to the following conditions: cycle once every 60 minutes, including dipping for 5 minutes; wet for 35 minutes; dry 20 minutes; total experiment time is 24 hours, 48 ​​hours, 72 hours, 96 hours or 120 hours. This is used to simulate the atmospheric corrosion process of the three materials. The corrosion weight loss and test time are listed in Table 8. The relationship curve between corrosion weight loss and test time is shown in Figure 4 , the regression analysis of corrosion weight loss and accelerated test time is shown in Table 9. Among the three aluminum-based aluminum alloys, 7A04 has the largest corrosion weight loss, followed by 3A21, and the smallest is 1050A; the corrosion laws are ...

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Abstract

The invention relates to an accelerated test method for simulating the atmospheric corrosion of metal materials, comprising the following steps: (1) preparing a metal sample; (2) preparing dipping solution from 0.01-1mol / L NaCl, 0.05-0.5mol / L Na2SO4 and 0-0.05mol / L Na2S2O8; (3) dipping the metal sample at 25-50 DEG C, humidifying the metal sample at 25-50 DEG C and drying the metal sample at 40-70 DEG C in a circulating way, and determining the single or total testing time according to the need; and (4) treating the metal sample to analyze the corrosion weight loss, the corrosion products and the morphology. The accelerated test method is used for simulating the behavior and the law on the atmospheric corrosion of the aluminum, the aluminum alloy and other aluminum materials in the humid and hot environment, the marine environment and other different environment and is also used for rapidly evaluating the corrosion resistance of various aluminum materials.

Description

Technical field [0001] The present invention relates to simulation technology of atmospheric corrosion, specifically an accelerated corrosion test method for simulating the atmospheric corrosion process of metal materials. Background technique [0002] The atmospheric corrosion of materials in the natural environment is an important basis for engineering design and anti-corrosion construction. Exposure test methods in the natural environment are usually used to understand the atmospheric corrosion of materials. However, the atmospheric exposure test cycle is very long, often lasting several years or even longer, and the test is highly regional. People hope to use laboratory accelerated corrosion tests to infer the results of outdoor long-term exposure tests, and then predict materials, products, and protective layers. Atmospheric corrosion life, to partially replace the atmospheric corrosion exposure test; on the other hand, people often want to obtain the corrosion differen...

Claims

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Application Information

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IPC IPC(8): G01N17/00
Inventor 郑弃非温军国孙霜青
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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