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Method for quantitatively measuring rusting ratio of surface of metal material

A technology for quantitative determination of metal materials, applied in the field of quantitative determination of surface corrosion rate, can solve the problems of difficulty in accurate quantitative determination of corrosion rate, no introduction, etc., and achieve the effect of continuous determination of corrosion rate

Inactive Publication Date: 2013-12-11
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, it is still difficult to accurately and quantitatively measure the corrosion rate, and none of the existing patents and documents have introduced it.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The corrosion rate of U71Mn high carbon heavy rail steel during the natural corrosion test. After the surface of the steel is subjected to a natural corrosion test, the surface of the sample to be tested is photographed with a camera to obtain a clear color image on the surface with an image quality of 5 million pixels. Then, use the two-phase area content determination software of the automatic metallographic image analyzer to open the surface image of the sample to be tested; select all the processed surface areas in the surface image of the sample to be tested; directly binarize the selected area image, and The selected area image is transformed into a binary image with only white and green, where green represents the color of the rusted area, and white represents the color of the uncorroded area; adjust the threshold range of the binarization until the rusted area in the binary image is completely changed Is green, and then extract the green area that represents the ...

Embodiment 3

[0026] Determination of the corrosion rate during the natural corrosion test of Q235 steel. After the steel surface is subjected to the salt spray corrosion test, the surface of the sample to be tested is photographed with a camera to obtain a clear color image on the surface with an image quality of 3 million pixels. Then, use photoshop or drawing board software to select all the processed surface areas in the surface image of the sample to be tested, and use the alpha phase area content determination software of the automatic metallographic image analyzer to open the surface image of the sample to be tested; directly enter the function of extracting the alpha phase , That is, binarize the selected area image, and convert the selected area image into a binary image using only white and green, where the green area represents the rusted color area, and white represents the color of the uncorroded area; Adjust the threshold range of binarization (for example, the threshold range ...

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Abstract

The invention provides a method for quantitatively measuring the rusting ratio of the surface of a metal material, and the method includes the following steps: obtaining a local or total surface image of a to-be-measured sample through image acquisition equipment and inputting the image in a computer; opening the surface image of the to-be-measured image through phase area content measuring software of an automatic metallographical image analyzer; selecting a regional image required for measurement in the surface image of the to-be-measured sample; performing binaryzation treatment on the regional image, so as to convert the regional image into a two-value image only containing two colors; converting colors of all the rust regions in the regional image into one color of the two colors through adjusting the range of the threshold; extracting regions with the color representing the rust regions in the two-value image of the regional image; and calculating the percentage of the total area of the regions with the color representing the rust regions and the area of the regional image through the content measuring function of the phase area content measuring software, so as to obtain the rusting ratio of the surface of the to-be-measured sample. The method provided by the invention can be used for accurately measuring the rusting ratio of the surface of the metal material sample, and is simple, convenient and quick.

Description

Technical field [0001] The invention relates to the field of metal material surface corrosion testing, and more specifically, to a method for quantitatively determining the surface corrosion rate. Background technique [0002] In the atmospheric corrosion or salt spray neutral corrosion test of metal materials, it is necessary to accurately and quantitatively evaluate the percentage of all or part of the rust area of ​​the sample surface to evaluate the test results. At present, for the samples after the corrosion test, the manual visual method and the one-hundred grid method are generally used to roughly evaluate the rust rate (that is, the percentage of the rust area of ​​the sample area). [0003] The manual visual inspection method is a method in which the tester conducts visual inspection and mental calculation to estimate the sum of the corrosion area of ​​the sample. Due to the large error of manual evaluation, large deviation of test results, and poor repeatability, even f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N17/00
Inventor 刘锦燕李大东王春建
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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