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Salt spray test relative corrosion area measurement method

A salt spray test, corrosion area technology, used in weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., can solve the problems of high pixel dependence, regular system and software upgrades, inconvenient operation, etc., to achieve clear pictures , the effect of low pixel dependence and easy operation

Inactive Publication Date: 2018-08-17
TANGSHAN GUOFENG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The conventional method of salt spray test is to measure with a ruler, and it is impossible to measure the precise size of the irregular shape. The area of ​​pitting corrosion is too small, and the calculation is often neglected. The measurement error is large and the operation is inconvenient.
[0004] Use the image software to distinguish the corroded area from the uncorroded area by the color difference value to calculate the relative corrosion area ratio, which is highly dependent on pixels, and cannot identify and judge the corroded area and the non-corroded area of ​​the board surface, which is highly dependent on the image and the external environment. , need to increase investment in equipment and software, the system and software need to be upgraded regularly, and long-term maintenance is required

Method used

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  • Salt spray test relative corrosion area measurement method
  • Salt spray test relative corrosion area measurement method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Make paper samples such as Figure 5 , the length is 150mm, and the width is 75mm. Any angle in the sample is transformed into a square and an isosceles right triangle, representing the corrosion area, and the side length is 20mm;

[0062] Mobile phone camera samples to ensure that the pictures are clear, and the naked eye can distinguish the corroded area from the uncorroded area;

[0063] Paste the picture into the white background AUTOCAD software;

[0064] Use the PL command to draw a finite closed polygon to fit the corrosion area and the total area of ​​the test sample;

[0065] Use the LI command to calculate the area of ​​each corrosion area and the area of ​​the entire sample;

[0066] Comparing the addition of each corrosion area with the total area of ​​the sample to calculate the relative corrosion area, the calculation results are shown in Figure 10 , the difference between the fitting value and the actual value is 0.02%, indicating that the accuracy of...

Embodiment 2

[0068] Preparation of salt spray test samples, such as Image 6 shown;

[0069] Salt spray test according to national standards;

[0070] After 72 hours of salt spray test, rinse the sample sample with desalted water, let it stand for 0.5-1 hour, blow it dry with a hair dryer, and wipe it clean with test paper;

[0071]Take photos of the salt spray test sample with the mobile phone to ensure that the picture is clear, and the naked eye can distinguish the corroded area from the uncorroded area;

[0072] Paste the picture into AUTOCAD software with white background; AUTOCAD version is 2004 and above;

[0073] Use the PL command to draw a finite closed polygon to fit the corrosion area and the total area of ​​the test sample; see Figure 7 with Figure 8 ;

[0074] Use the LI command to calculate the area of ​​each corrosion area and the area of ​​the entire sample; see Figure 9 ;

[0075] The relative corrosion area is calculated by comparing the addition of each corros...

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Abstract

The invention relates to a salt spray test relative corrosion area measurement method and belongs to the technology of coating relative corrosion area measurement. The salt spray test relative corrosion area measurement method comprises the steps of taking a passivated galvanized plate as a salt spray test sample plate, after salt spray test is performed for 72 h, standing the sample plate for 0.5-1 h, washing the salt spray test sample plate through desalted water, blow-drying the salt spray test sample plate through a blow dryer, and wiping the salt spray test sample plate through test paperuntil no residue remains; taking photos of the salt spray test sample plate, ensuring clearness of images so that a user can identified corroded zones and uncorroded zones by naked eyes; adhering theimages to a white background of the software of AUTOCAD; drawing limited closed polygons through PL command to separately fit every corroded zone and the overall zone of the salt spray test sample plate; computing the area of every corroded zone and the area of the entire salt spray test sample plate through LI command; comparing the sum of the areas of the corroded zones and the overall area ofthe salt spray test sample plate to calculate a relative corrosion area. The salt spray test relative corrosion area measurement method saves ruler measurement and is simple in operation, low in dependence on pixel and capable of distinguishing corrosion morphology of various salt spray tests.

Description

technical field [0001] The invention relates to a method for measuring and calculating the relative corrosion area of ​​a salt spray test, which is used for calculating the relative corrosion area ratio of galvanized steel sheets, and belongs to the calculation technology for the relative corrosion area of ​​coatings. Background technique [0002] The salt spray test of galvanized steel sheet is an important index to check the corrosion resistance of the coating. The salt spray test is generally carried out according to the national standard GB6458-86, and the corrosion level is judged according to the GB / T6461-2002 standard. [0003] The conventional method of salt spray test is to measure with a ruler, and it is impossible to measure the precise size of the irregular shape. The area of ​​pitting corrosion is too small, and the calculation is often neglected. The measurement error is large and the operation is inconvenient. [0004] Use the image software to distinguish the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00G01B11/28
CPCG01B11/28G01N17/006
Inventor 苏金波李岩杰王鹏李科学牛世浦佟正臣兰明清柳作成杨宁李江张立军杨磊
Owner TANGSHAN GUOFENG IRON & STEEL
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