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Test method for stimulating corrosion process of low-alloy steel in atmospheric environment in salt lake

A low-alloy steel, atmospheric environment technology, applied in the direction of weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., can solve problems such as long time

Inactive Publication Date: 2009-11-04
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

Outdoor exposure testing at an atmospheric corrosion station is the traditional method for studying atmospheric corrosion of low alloy steels, but it takes a long time to complete
There are currently no studies on simulating the corrosion of low-alloy steels in a saline-rich salt lake atmosphere

Method used

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  • Test method for stimulating corrosion process of low-alloy steel in atmospheric environment in salt lake
  • Test method for stimulating corrosion process of low-alloy steel in atmospheric environment in salt lake
  • Test method for stimulating corrosion process of low-alloy steel in atmospheric environment in salt lake

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The test material is the above-mentioned Corten A weathering steel, and the saline lake water diluted 20 times with distilled water is used as the corrosion medium, and the cycle is repeated every 20 minutes in the order of "dipping→drying→wetting", among which: dipping at 40°C for 2min; drying at 50°C 15min; wet at 40°C, 3min; test time is 6 hours. The rust layer on the surface of the sample contains a large amount of foreign elements such as Cl and Mg. From figure 1 It can be seen from the X-ray diffraction spectrum of the corrosion products in the medium that the rust layer is mainly composed of β-FeOOH, Fe 8 (O,OH) 16 Cl 1.3 and γ-FeOOH; Among them, A: β-FeOOH; L: γ-FeOOH; M: Fe 3 o 4 ; C: Fe 8 (O,OH) 16 Cl 1.3 ; D: Mg 4 Fe(OH) 8 OCl·xH 2 O.

Embodiment 2

[0035] The test material is the above-mentioned Corten A weathering steel, and the saline lake water diluted 20 times with distilled water is used as the corrosion medium, and the cycle is repeated every 20 minutes in the order of "dipping→drying→wetting", among which: dipping at 40°C for 2min; drying at 50°C 15min; wet at 40°C, 3min; test time is 12 hours. Such as figure 2 As shown, the corrosion amount of the 12-hour sample is 63.32g m -2 . The rust layer contains a large amount of foreign elements such as Cl and Mg. From image 3 It can be seen from the electrochemical polarization curve that the anodic current of the 12-hour sample increases exponentially with the potential. The cathodic current varies little with the increase of potential and is controlled by oxygen diffusion. Rust layer resistance R of the sample R The value is 4.09Ω·cm 2 .

Embodiment 3

[0037] The test material is the above-mentioned Corten A weathering steel, and the saline lake water diluted 20 times with distilled water is used as the corrosion medium, and the cycle is repeated every 20 minutes in the order of "dipping→drying→wetting", among which: dipping at 40°C for 2min; drying at 50°C 15min; wet at 40°C, 3min; test time is 24 hours. From figure 1 It can be seen from the X-ray diffraction spectrum of corrosion products that the rust layer is mainly composed of β-FeOOH, Fe 8 (O,OH) 16 Cl 1.3 , γ-FeOOH, Fe 3 o 4 and Mg 4 Fe(OH) 8 OCl·xH 2 O. Compared with the 6-hour sample, the corrosion product of the 24-hour sample appeared a new phase Fe 3 o 4 and Mg 4 Fe(OH) 8 OCl·xH 2 O. Such as figure 2 As shown, the corrosion amount of the 24-hour sample is 114.06g m -2 . The rust layer contains a large amount of foreign elements such as Cl and Mg. From image 3 From the electrochemical polarization curve, it can be seen that the polarization cu...

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Abstract

The invention relates to an atmospheric corrosion simulation technology for low-alloy steel, in particular to a test method for stimulating the corrosion process of low-alloy steel in the atmospheric environment in a salt lake. The method comprises the following steps: the low-alloy steel is taken as the test material, the salt lake water diluted by 20-50times is used as the corrosive medium, the low-alloy steel is dipped, dried and humidified in sequence every 20-30 minutes, wherein the low-alloy steel is dipped for 2-4 min at 40-50 DEG C; the low-alloy steel is dried for 15-20 min at 50-70 DEG C; the low-alloy steel is humidified for 3-6 min at 40-50 DEG C; and the test time is 6-96 h. The invention has the imitativeness, the acceleration capability and the reproducibility so as to stimulate the atmospheric corrosion process in the slat lake, can be used for studying the corrosion behavior of the low-alloy steel in the atmospheric environment in the salt lake, can perform evaluation and predication and provides the basis for reasonably selecting the material and using the proper protection method.

Description

technical field [0001] The invention relates to atmospheric corrosion simulation technology of low-alloy steel, and in particular provides a test method for simulating the corrosion process of low-alloy steel in the atmospheric environment of rich salt lakes. Background technique [0002] Low-alloy steel is the most basic structural material for construction, machinery, transportation, and conventional weapons. From raw material inventory, parts processing and assembly, transportation and storage of finished products, to the final service process, they will be subject to varying degrees. Atmospheric corrosion, resulting in reduced performance and shortened service life. The traditional methods for studying the atmospheric corrosion of low alloy steel include outdoor exposure test and indoor accelerated corrosion test. Outdoor exposure testing at an atmospheric corrosion station is a traditional method for studying atmospheric corrosion of low alloy steels, but it takes a lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00
Inventor 王振尧李巧霞韩恩厚
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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