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Evaluation method for surface rust layer after rapid rust formation of weathering resistant steel

An evaluation method, weather-resistant steel technology, applied in the direction of weather resistance/light resistance/corrosion resistance, climate sustainability, instruments, etc., can solve the problems of no better and objective evaluation method, and achieve the effect of portability

Active Publication Date: 2021-10-01
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after the rapid rusting of weathering steel, the evaluation method of whether the performance of the rust layer meets the requirements for use is currently limited to visual evaluation of weathering steel after rapid rusting, and whether the performance of the rust layer can meet the requirements for use There is no better and objective evaluation method, so it is necessary to establish a quantifiable measurement method for weathering steel rust layer

Method used

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  • Evaluation method for surface rust layer after rapid rust formation of weathering resistant steel
  • Evaluation method for surface rust layer after rapid rust formation of weathering resistant steel
  • Evaluation method for surface rust layer after rapid rust formation of weathering resistant steel

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Experimental program
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Effect test

Embodiment 1

[0035] Embodiment 1 A method for evaluating the surface rust layer after rapid rusting of weathering steel, the specific steps are as follows:

[0036] (1) Select Q690 steel with length × width = 10 × 5cm, and after 2 weeks of storage in an area with high humidity, obvious yellow rust appears on the surface, see figure 1 , retrieve the sample;

[0037] (2) Select the galvanized steel plate with length × width = 10 × 5cm to make the standard plate-grid plate, and cut the surface of the galvanized steel plate into 32 grids of the same size (length × width = 1 × 1cm), between adjacent grids The intervals are 2.5mm, and the grids are labeled from top to bottom and from left to right (such as figure 2 shown);

[0038] (3) Put the standard plate on the surface of the sample to be tested, and the surface of the sample is exposed corresponding to the grid of the standard plate. A total of 32 such surfaces are exposed, choose 1, 3, 6, 10, 12, 17, 19, 22, 24 , No. 27 and other 10 p...

Embodiment 2

[0050] Embodiment 2 A kind of method for evaluating the surface rust layer after weathering steel quickly rusts, the specific steps are as follows:

[0051] Choose weathering steel after two years of outdoor exposure, and a relatively uniform brown rust layer appears on the surface (see Figure 4 ), carry out the detection of Raman and color difference value according to the method of embodiment 1, the color difference value ΔE scope of detection is 65~68, median value 66, and Raman records gamma-FeOOH and α-FeOOH in the rust layer The content ratio of γ-FeOOH and α-FeOOH is between 0.8-2.3. Through statistical analysis, it is found that the median value in each group of data is representative, and the content ratio of γ-FeOOH and α-FeOOH is about 1.331.

Embodiment 3

[0052] Embodiment 3 A method for evaluating the surface rust layer after rapid rusting of weathering steel, the specific steps are as follows:

[0053] The bridge weathering steel after 8 years of outdoor exposure was selected. Without any treatment before exposure, a relatively uniform brown rust layer appeared on the surface of the weathering steel (see Figure 5 ). Carry out the detection of Raman and color difference value according to the method for embodiment 1, the color difference value ΔE scope of detection is 70-75, median value 73; Raman records the content of γ-FeOOH and α-FeOOH in the rust layer The ratio is between 0.5-1.0, and through statistical analysis, the median value of the content ratio of γ-FeOOH and α-FeOOH is about 0.725.

[0054] The rust layer of bridge weathering steel after 8 years of outdoor exposure is darker than other rust layers. According to practical experience, it can better adhere to the surface of weathering steel and is less prone to th...

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Abstract

The invention belongs to the technical field of corrosion inspection, and particularly relates to an evaluation method for a surface rust layer after rapid rust formation of weathering resistant steel. The method comprises the following steps: accurately partitioning the surface of a weathering resistant steel sample by using a standard grating plate, carrying out microscopic analysis through Raman spectrum, confirming components of the rust layer and the ratio of the components, carrying out semi-quantitative analysis on the color of the rust layer through a colorimeter, and finding out the corresponding relation between the macroscopic color and the microscopic components of the rust layer on the surface of the weathering resistant steel. A set of method for macroscopically evaluating the performance of the rust layer can be established by contrastive analysis of the rust layers with different colors, the content range of each component in the rust layer can be determined only by measuring the chromatic aberration value of the rust layer, accurate support is provided for engineering use, and a colorimeter is convenient to carry to engineering application places and strong support is provided for later evaluation of the rusting condition of the weathering resistant steel on a construction site.

Description

technical field [0001] The invention belongs to the technical field of corrosion inspection, and in particular relates to an evaluation method for a rust layer on the surface of weathering steel after rapid rust formation. Background technique [0002] Atmospheric corrosion is an important cause of early failure and destruction of products, equipment, devices, and structural parts. The annual economic loss caused by atmospheric corrosion accounts for about 5% of the total value of the national economy, and the loss is extremely alarming. The atmospheric corrosion rate of steel is closely related to its atmospheric environment. Different pollutants in the atmosphere have different effects on the corrosion rate of steel. SO in industrial atmosphere 2 The salt particles in the oceanic atmosphere have the greatest influence on the corrosion rate of steel, and the corrosion rate of steel is very low in the pure rural atmospheric environment. Atmospheric corrosion of steel is ...

Claims

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Application Information

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IPC IPC(8): G01N17/00G01N21/65
CPCG01N17/006G01N21/65Y02A90/10
Inventor 李江文郎丰军周庆军黄先球马颖程鹏吴玮巍庞涛宋建红
Owner 武汉钢铁有限公司
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