CN103411875A - Quantitative measurement method for surface corrosion rate of film coated steel plate - Google Patents
Quantitative measurement method for surface corrosion rate of film coated steel plate Download PDFInfo
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Abstract
The invention discloses a quantitative measurement method for the surface corrosion rate of a film coated steel plate. The quantitative measurement method comprises the following steps: A, filling in the white rust areas of the film coated steel plate to be measured with dark color so as to form color contrast between the white rust areas and a basal body; B, acquiring the surface image of the film coated steel plate to be measured through an image acquisition device, and inputting the surface image to a computer; C, performing binarization processing on the surface image to obtain a binary image, and extracting the areas I, representing the white rust areas, in the binary image; D, calculating the sum of the areas of the areas I and the percentage of the areas of the areas I to the total area of the binary image through the content measurement function of the phase area content measurement software of an automatic metallographic image analyzer, so as to obtain the surface corrosion rate of the film coated steel plate. Through the adoption of the quantitative measurement method, more accurate quantitative measurement can be performed on the surface corrosion rate of the film coated steel plate. Besides, the operation of the quantitative measurement method is simple and convenient, and is very suitable for a laboratory environment.
Description
Technical field
The present invention relates to corrosion test field, more particularly, relate to a kind of the film method of surface of steel plate rate of corrosion of quantitative measurement.
Background technology
In order to prevent that surface of steel plate corrosion need to be coated with rust-preventing film on its surface, then need to its carry out salt air corrosion and Water Resistance Test and qualitative assessment steel plate sample all or the number percent of local corrosion area, with the film corrosion resistance of surface of steel plate of evaluation.Because white rust district and matrix after corrosion on plated film steel plate sample are more or less the same, and because the angle of taking is different with light, easily make to corrode shallow white rust zone while with image input device, gathering image, disappear, unsharp picture can not extract the shallow white rust district of corrosion fully.At present, for the sample after corrosion test, generally adopt artificial visually examine's method, stroke hundred lattice methods to carry out general coarse evaluation rate of corrosion (number percent).
Artificial visually examine's method be by testing crew to the corroded area sum of sample estimate, mental arithmetic, even veteran testing crew also causes easily that the manual evaluation error is large, the test findings deviation is large and poor repeatability.The rate of corrosion assessment result difference of different testing crews to same sample, same testing crew is also different to the rate of corrosion assessment result of same sample in the different time, and unique advantage is that speed is fast.
The hundred lattice methods of drawing are by testing crew, to be drawn hundred lattice of 10 row * 10 row at the sample surfaces of needs assessment, carry out evaluation of corrosion rate (number percent) by the grid quantity that white rust district area accounts in hundred lattice.White rust edge or indivedual white rust point also can not take 1 grid, need the several grid sums of testing crew estimation to calculate and take 1 grid.Hundred lattice methods like this can only be slightly more accurate than ocular estimate evaluation of corrosion rate (number percent), but actual result differs also very large.
The automatic metallic phase image analyzer is an auxiliary device on metaloscope, and what analyze is the phase in microstructure, and image is by the microscope collection.The present invention utilizes stereology principle in quantitative metallography and the phase area assay software function in the automatic metallic phase image analyzer to invent a kind of method for quantitatively determining of the steel plate corrosion rate of filming.
Also more difficult to the accurate quantification mensuration of the surface of steel plate rate of corrosion of filming at present, the data at home and abroad document is without introduction.
Summary of the invention
For the deficiencies in the prior art, one of purpose of the present invention is to solve in above-mentioned prior art the one or more problems that exist.
Fundamental purpose of the present invention is to provide a kind of quantitative measurement comparatively exactly method of surface of steel plate rate of corrosion of filming.
To achieve these goals, the invention provides a kind of method for quantitatively determining of the surface of steel plate rate of corrosion of filming, described method comprises the steps: A, the white rust district on the steel plate of filming to be measured is filled to matrix, form colour contrast with dark pen; B, obtain the surface image of the described steel plate of filming to be measured and input computing machine by image capture device; C, described surface image is carried out to binary conversion treatment obtain bianry image, extract the zone that represents the color in white rust district in bianry image; In the described bianry image of assay function calculating in the phase area assay software of D, employing automatic metallic phase image analyzer, represent that the region area sum of the color in white rust district accounts for the number percent of total image area, obtains the surface corrosion rate of the steel plate of filming to be measured.
An embodiment according to the method for quantitatively determining of the surface of steel plate rate of corrosion of filming of the present invention, take to obtain all surfaces image or local surfaces image with image capture device to all surfaces or the local surfaces of the steel plate of filming to be measured.
An embodiment according to the method for quantitatively determining of the surface of steel plate rate of corrosion of filming of the present invention, described step C also comprises that debugging functions are by hand augmented or repaiied the zone of the color that represents the white rust district extracted and subtracts, and the zone of the color in white rust district is extracted fully until represent.
According to an embodiment of the method for quantitatively determining of the surface of steel plate rate of corrosion of filming of the present invention, the described step C of repetitive operation is to step D many times, and the surface corrosion rate of the steel plate of filming to be measured that repeatedly obtains is averaged.
Adopt method of the present invention, can carry out quantitative measurment comparatively accurately to the surface corrosion rate of the steel plate of filming, simple to operation, be very suitable for the application under laboratory environment.
Embodiment
Hereinafter, in connection with exemplary embodiment, specifically describe the method for quantitatively determining of the surface of steel plate rate of corrosion of filming of the present invention.
Method for quantitatively determining of filming the surface of steel plate rate of corrosion of the present invention comprises the following steps:
At first, the white rust district on the steel plate of filming to be measured is filled to matrix, form colour contrast with dark pen.The rusty stain of steel plate is white rust because film, and on ropy photo, can't see the shallow white rust of corrosion at all, therefore need to carry out pre-service to the surface of the steel plate of filming to be measured, so that white rust district and matrix form obvious colour contrast, is convenient to follow-up image and processes.Wherein, the steel plate of filming is steel plate or the antirust coat steel plate that is coated with oil/moisture film, be specifically as follows and be coated with metal level and be the steel of white rust at the rust that corrosion forms afterwards, as galvanized steel plain sheet, Al-Zn coated steel, nickel-clad steel plate, alclad sheet or zinc-plated magnalium plate etc., the steel plate of filming to be measured is for having carried out surperficial water resistant test, natural rust test or the resulting sample of salt fog corrosion test to the above-mentioned steel plate of filming.
Then, obtain the surface image of the described steel plate of filming to be measured and input computing machine by image capture device, image capture device can be scanner, digital camera or stereomicroscope etc.But due to above-mentioned pre-treatment step being arranged, thereby the present invention do not require for the resolution of collection image, and image can be clearly, can be also unsharp.Also can as required, to all surfaces or the local surfaces of the steel plate of filming to be measured, take to obtain all surfaces image or local surfaces image with image capture device.
Afterwards, described surface image is carried out to binary conversion treatment and obtain bianry image, extract the zone that represents the color in white rust district in bianry image.After binary conversion treatment, surface image comprises the zone of the color that represents the white rust district and represents the zone of the color of matrix, so just can carry out follow-up white rust district extraction step.
Finally, in the described bianry image of assay function calculating in the phase area assay software of employing automatic metallic phase image analyzer, represent that the region area sum of the color in white rust district accounts for the number percent of total image area, obtains the surface corrosion rate of the steel plate of filming to be measured.
Owing on surface image, may having brightness or the inhomogeneous place of contrast, this easily causes the error extraction of software, therefore, the operator preferably can augment or repair the zone of the color that represents the white rust district extracted by manual debugging functions according to actual conditions and subtract, be about to that the undrawn zone that represents the color in white rust district is filled or be not that delete in the zone that represents the color in white rust district by this, the zone of the color in white rust district is extracted fully until represent, can effectively improve like this accuracy of result.Simultaneously, in order to reduce the error in manual operation and to improve the precision that detects data, also can carry out repeatedly for same image the step of binary conversion treatment, extraction and statistical computation, and the surface of steel plate rate of corrosion of filming to be measured that will repeatedly record averages, namely obtain the final measurement result of the surface of steel plate rate of corrosion of filming to be measured.In addition, can also carry out subregion to the large-area steel plate sample of filming to be measured and take pictures and the subregion method for measuring, the purpose that subregion is measured is can carry out part amplification to corroding shallow sample, in order to measure more accurately its rate of corrosion.
Below by concrete example, method for quantitatively determining of filming the surface of steel plate rate of corrosion of the present invention is described.
Example 1:
The rate of corrosion of galvanized steel sheet surface water resistant test of filming is measured
At first, one of the galvanized steel plain sheet of filming of intercepting 75 * 100mm, the about pure water of 100 ℃ is dropped in to the galvanized steel sheet surface of filming to carry out water resistant test and obtains the steel plate of filming to be measured No. 1, then on No. 1 steel plate of filming to be measured, determine the white rust district with dark oil pike, with digital camera, carry out full surface again and take, obtain surface image.
Determination step: 1) adopt metallographic examination special software-two phase area assay software to open surface image; 2) choose in image and need the surface area of measuring (total Test area); 3) image transitions is become to gray level image, then carry out binary conversion treatment, image is changed into to the bianry image that only has two kinds of colors, the zone of adjusting the upper and lower limit threshold value and extracting the color that represents the white rust district, until the white rust district is extracted fully; 4) debugging functions are augmented or are repaiied and subtract by hand, guarantee that the white rust district is all extracted; 5) degree that the region area sum that represents the color in white rust district in the bianry image obtained with two phase area assay function calculatings accounts for total image area is rate of corrosion.In this example, rate of corrosion has been carried out to three times and measured, its rate of corrosion measured value is as shown in table 1, and the average corrosion rate of No. 1 steel plate of filming to be measured is 1.47%.
The rate of corrosion test findings of table 1 example 1
| Numbering | Rate of corrosion (%) |
| A1 | 1.66 |
| A2 | 1.12 |
| A3 | 1.62 |
Example 2:
The rate of corrosion of surface of steel plate salt fog corrosion test of filming is measured
At first, one group of the galvanized steel plain sheet of filming of intercepting 75 * 100mm, totally three, the surface of steel plate of filming carries out on request the salt fog corrosion test and obtains three No. 2 steel plates of filming to be measured, then on the steel plate of filming to be measured, determine the white rust district with dark oil pike respectively, with digital camera, carry out full surface again and take, obtain surface image.
Determination step: 1) adopt metallographic examination special software-α phase area assay software to open surface image; 2) choose in image and need the surface area of measuring (total Test area); 3) image transitions is become to gray level image, then carry out binary conversion treatment, image is changed into to the bianry image that only has two kinds of colors, enter and extract α phase function, the zone of adjusting threshold curve and extracting the color that represents the white rust district, until the white rust district is extracted fully; 4) debugging functions are augmented or are repaiied and subtract by hand, guarantee that the white rust district is all extracted; 5) degree that the region area sum that represents the color in white rust district in the bianry image obtained with α phase area assay function calculating accounts for total image area is rate of corrosion.In this example, the rate of corrosion of three samples has respectively been carried out to one-shot measurement, its rate of corrosion measured value is as shown in table 2, and the average corrosion rate of No. 2 steel plates of filming to be measured is 20.9%.
The rate of corrosion test findings of table 2 example 2
| Numbering | Rate of corrosion (%) |
| B1 | 30.94 |
| B2 | 18.58 |
| B3 | 13.29 |
Example 3:
The rate of corrosion of surface of steel plate salt fog corrosion test of filming is measured
At first, one of the galvanized steel plain sheet of filming of intercepting 225 * 300mm, after the surface of steel plate of filming carries out the salt fog corrosion test on request, the surface area of the steel plate of filming to be measured is divided into to three regional areas, then with digital camera or stereomicroscope, three regional areas of the steel plate of filming to be measured are carried out to surface and take, obtain the surface image of several regional areas.
Determination step: 1) adopt metallographic examination special software-α phase area assay software to open the surface image of a width regional area; 2) choose in image and need the surface area of measuring; 3) image transitions is become to gray level image, then carry out binary conversion treatment, image is changed into to the bianry image that only has two kinds of colors, enter and extract α phase function, the zone of adjusting threshold curve and extracting the color that represents the white rust district, until the white rust district is extracted fully; 4) debugging functions are augmented or are repaiied and subtract by hand, guarantee that the white rust district is all extracted; 5) degree that the region area sum that represents the color in white rust district in the bianry image obtained with α phase area assay function calculating accounts for total image area is the rate of corrosion of this regional area; 6) measure respectively the rate of corrosion of each regional area, then the rate of corrosion addition that each regional area is measured is obtained to the mean value of the rate of corrosion of the whole steel plate of filming to be measured divided by the number of regional area.The mean value of the rate of corrosion of the steel plate of filming whole to be measured of the rate of corrosion measured value of each regional area and calculating gained is as shown in table 3.
The rate of corrosion test findings of table 3 example 3
In sum, the method for quantitatively determining of the surface of steel plate rate of corrosion of filming of the present invention can be quick and easy, realize the filming quantitative measurement of surface of steel plate rate of corrosion efficiently and accurately.
Although specifically described the method for quantitatively determining of the surface of steel plate rate of corrosion of filming of the present invention, those skilled in the art will appreciate that without departing from the spirit and scope of the present invention, can make various forms of changes to the present invention.
Claims (4)
1. the method for quantitatively determining of surface of steel plate rate of corrosion of filming, is characterized in that, described method comprises the steps:
A, the white rust district on the steel plate of filming to be measured is filled to matrix, form colour contrast with dark pen;
B, obtain the surface image of the described steel plate of filming to be measured and input computing machine by image capture device;
C, described surface image is carried out to binary conversion treatment obtain bianry image, extract the zone that represents the color in white rust district in bianry image;
In the described bianry image of assay function calculating in the phase area assay software of D, employing automatic metallic phase image analyzer, represent that the region area sum of the color in white rust district accounts for the number percent of total image area, obtains the surface corrosion rate of the steel plate of filming to be measured.
2. the method for quantitatively determining of the surface of steel plate rate of corrosion of filming according to claim 1, is characterized in that, with image capture device, all surfaces or the local surfaces of the steel plate of filming to be measured taken to obtain all surfaces image or local surfaces image.
3. the method for quantitatively determining of the surface of steel plate rate of corrosion of filming according to claim 1, it is characterized in that, described step C also comprises that debugging functions are by hand augmented or repaiied the zone of the color that represents the white rust district extracted and subtracts, and the zone of the color in white rust district is extracted fully until represent.
4. the method for quantitatively determining of the surface of steel plate rate of corrosion of filming according to claim 1, is characterized in that, the described step C of repetitive operation is to step D many times, and the surface corrosion rate of the steel plate of filming to be measured that repeatedly obtains is averaged.
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| CN104391101A (en) * | 2014-11-19 | 2015-03-04 | 中国航空工业集团公司沈阳飞机设计研究所 | Optimization method for thickness of aluminum alloy high-corrosion-resistance sulfuric acid anodized film layer |
| CN104404582A (en) * | 2014-11-19 | 2015-03-11 | 中国航空工业集团公司沈阳飞机设计研究所 | Method for optimizing high-corrosion resistance cadmium titanium plating layers of ultrahigh-strength steel |
| CN105548229A (en) * | 2015-12-08 | 2016-05-04 | 国网山东省电力公司电力科学研究院 | Detection method for assessment of corrosion state of tower zinc coating surface |
| CN106770327A (en) * | 2016-12-26 | 2017-05-31 | 钢铁研究总院 | A kind of quantitative detecting method of the surface corrosion area for hot-rolled reinforced bar |
| CN108226158A (en) * | 2017-12-27 | 2018-06-29 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of detection method for irregular masonry mortar plumpness |
| CN108414430A (en) * | 2018-03-12 | 2018-08-17 | 唐山国丰钢铁有限公司 | The measuring method of the relatively corrosive area of salt spray test |
| CN110806377A (en) * | 2019-11-21 | 2020-02-18 | 出门问问信息科技有限公司 | Corrosion resistance testing method, device, equipment and computer readable storage medium |
| CN113093845A (en) * | 2021-04-07 | 2021-07-09 | 武汉量卓科技有限公司 | Exhibition hall exhibition environment analysis regulation and control central control system based on cloud computing and Internet of things |
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| CN104391101A (en) * | 2014-11-19 | 2015-03-04 | 中国航空工业集团公司沈阳飞机设计研究所 | Optimization method for thickness of aluminum alloy high-corrosion-resistance sulfuric acid anodized film layer |
| CN104404582A (en) * | 2014-11-19 | 2015-03-11 | 中国航空工业集团公司沈阳飞机设计研究所 | Method for optimizing high-corrosion resistance cadmium titanium plating layers of ultrahigh-strength steel |
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| CN106770327A (en) * | 2016-12-26 | 2017-05-31 | 钢铁研究总院 | A kind of quantitative detecting method of the surface corrosion area for hot-rolled reinforced bar |
| CN108226158A (en) * | 2017-12-27 | 2018-06-29 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of detection method for irregular masonry mortar plumpness |
| CN108414430A (en) * | 2018-03-12 | 2018-08-17 | 唐山国丰钢铁有限公司 | The measuring method of the relatively corrosive area of salt spray test |
| CN110806377A (en) * | 2019-11-21 | 2020-02-18 | 出门问问信息科技有限公司 | Corrosion resistance testing method, device, equipment and computer readable storage medium |
| CN113686261A (en) * | 2020-05-13 | 2021-11-23 | 苏州阿特斯阳光电力科技有限公司 | Silicon wafer suede testing method and device, electronic equipment and readable storage medium |
| CN113093845A (en) * | 2021-04-07 | 2021-07-09 | 武汉量卓科技有限公司 | Exhibition hall exhibition environment analysis regulation and control central control system based on cloud computing and Internet of things |
| CN114152617A (en) * | 2021-10-14 | 2022-03-08 | 攀钢集团研究院有限公司 | Method for accurately measuring and reducing proportion and distribution of proeutectoid cementite |
| CN114264591A (en) * | 2021-12-23 | 2022-04-01 | 中国兵器工业第五九研究所 | Device and method for evaluating corrosion appearance of metal standard part |
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