CN113252542A - Evaluation method for fracture corrosion resistance of coated steel plate - Google Patents
Evaluation method for fracture corrosion resistance of coated steel plate Download PDFInfo
- Publication number
- CN113252542A CN113252542A CN202110413582.6A CN202110413582A CN113252542A CN 113252542 A CN113252542 A CN 113252542A CN 202110413582 A CN202110413582 A CN 202110413582A CN 113252542 A CN113252542 A CN 113252542A
- Authority
- CN
- China
- Prior art keywords
- octagonal
- corrosion
- fracture
- sample wafer
- dimensional sample
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Environmental & Geological Engineering (AREA)
- Environmental Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention discloses an evaluation method of fracture corrosion resistance of a coated steel plate, which comprises the following steps: processing a to-be-detected plated steel plate sample to obtain an octagonal three-dimensional sample wafer with the longitudinal section side length being more than or equal to 40 mm; sealing the octagonal three-dimensional sample wafer, and then placing the octagonal three-dimensional sample wafer in a moving corrosion medium for corrosion test to obtain an octagonal three-dimensional sample wafer containing red corrosion products; an included angle formed by the motion direction of the corrosive medium and the normal direction of the surface of the octagonal three-dimensional sample wafer is not less than 80 degrees, and an included angle formed by the motion direction of the corrosive medium and one side of the octagonal three-dimensional sample wafer is not less than 80 degrees; after photographing, obtaining a longitudinal section picture of the octagonal stereoscopic sample wafer and obtaining the ratio S of the area occupied by the red corrosion products to the total area of the longitudinal sectioni(ii) a According to said ratio SiThe corrosion resistance of the coated steel sheet at the fracture was evaluated. The method can realize reliable evaluation of the fracture corrosion resistance of the coated steel plate, and has simple operation and high reliability.
Description
Technical Field
The invention relates to the field of quality detection of a coated steel plate, in particular to an evaluation method for the fracture corrosion resistance of the coated steel plate.
Background
Plated steel sheets have good corrosion resistance, long service life, simple manufacturing process, and low product price, and are increasingly demanded in many different industries such as automobile industry, electric appliance industry, and construction industry. The plating layer of the plated steel sheet is various, and includes a pure zinc plating layer, a zinc-nickel alloy plating layer, a zinc-aluminum alloy plating layer, an aluminum-zinc alloy plating layer, a zinc-aluminum-magnesium plated steel sheet, an aluminum-silicon alloy plated steel sheet, and the like. These coatings often contain certain amounts of Zn and/or Al, which provide physical shielding protection and cathodic protection to the steel sheet. The corrosion resistance of the plated steel sheet is generally evaluated by a combination of laboratory accelerated corrosion and outdoor corrosion tests. Wherein the laboratory accelerated corrosion comprises a soaking experiment, a salt spray experiment, a circulating corrosion experiment, a damp-heat experiment and the like. These corrosion tests have standard procedures.
However, the corrosion tests described above are all for evaluating the surface corrosion resistance of a plated steel sheet. However, in practice, the coated steel sheet is cut and processed before use. During the cutting process, the cut fracture sites of the coated steel sheet are exposed. There is no reliable evaluation method for the corrosion resistance of the cut port position of the plated steel sheet.
In the traditional method for evaluating the surface of the coated steel plate, fracture positions of rectangular or square coated steel plate samples with different sizes are sealed, then the samples are placed in a certain corrosion environment to carry out a corrosion test for a certain period, and then the corrosion behavior of the surface of the coating is observed and analyzed. This method cannot evaluate the corrosion resistance of the fracture.
Therefore, how to develop an evaluation method for fracture corrosion resistance of a plated steel sheet can realize reliable evaluation of fracture corrosion resistance of the plated steel sheet, and becomes a key problem for research of metallurgical workers.
Disclosure of Invention
The invention aims to provide an evaluation method for the fracture corrosion resistance of a plated steel plate, which can realize reliable evaluation on the fracture corrosion resistance of the plated steel plate and has the advantages of simple operation and high reliability.
In order to achieve the above object, the present invention provides a method for evaluating fracture corrosion resistance of a plated steel sheet, comprising:
processing a to-be-detected plated steel plate sample to obtain an octagonal three-dimensional sample wafer, wherein the side length of the longitudinal section of the octagonal three-dimensional sample wafer is more than or equal to 40 mm;
sealing the octagonal three-dimensional sample wafer, and then placing the octagonal three-dimensional sample wafer in a moving corrosion medium for corrosion test to enable the longitudinal section of the three-dimensional sample wafer to generate a red corrosion product, so as to obtain the octagonal three-dimensional sample wafer containing the red corrosion product; an included angle formed by the motion direction of the corrosive medium and the normal direction of the surface of the octagonal three-dimensional sample wafer is not less than 80 degrees, and an included angle formed by the motion direction of the corrosive medium and one side of the octagonal three-dimensional sample wafer is not less than 80 degrees;
photographing the longitudinal section of the octagonal stereoscopic sample containing red corrosion products to obtain a longitudinal section picture of the octagonal stereoscopic sample;
obtaining the ratio S of the area occupied by the red corrosion products to the total area of the longitudinal section according to the longitudinal section picture of the octagonal three-dimensional sample waferi；
According to said ratio SiThe corrosion resistance of the coated steel sheet at the fracture was evaluated.
Further, burrs exist on each edge of the octagonal stereoscopic sample wafer.
Further, the burr length L of each edge of the octagonal stereoscopic sample wafer is less than or equal to 1/3, and L is less than or equal to 1 mm.
Furthermore, in the photographing, a camera device with the resolution not less than 512 pixels/mm is adopted.
Further, the corrosive medium includes one of neutral salt spray, acid salt spray, and simulated seawater.
Further, the octagonal stereoscopic sample wafer is a regular octagonal stereoscopic sample wafer.
Furthermore, the included angle formed by the motion direction of the corrosive medium and the normal direction of the surface of the octagonal stereoscopic sample wafer is not less than 85 degrees.
Furthermore, the included angle formed by the motion direction of the corrosive medium and one side of the octagonal stereoscopic sample wafer is more than or equal to 85 degrees.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the invention provides an evaluation method of fracture corrosion resistance of a coated steel plate, which comprises the following steps of (1) firstly processing the steel plate into an octagonal three-dimensional sample wafer with each side length being more than or equal to 40 mm; in the practical use process of the coated steel plate, the action direction of the corrosion medium on the fracture of the coated steel plate can be changed continuously, so that the direction of the corrosion medium on the fracture is an important index for evaluating the corrosion of the fracture. Therefore, the octagonal sample wafer is designed, so that the corrosion tests in a plurality of corrosion medium acting directions can be simultaneously carried out on the same sample wafer. The influence of different corrosion medium directions is difficult to be reflected completely by the traditional quadrilateral sample wafer, and the discreteness of the test result of the symmetrical edge is overlarge. However, if the number of edges is larger, the corrosion difference of the fracture in the adjacent direction is further reduced, the corrosion difference caused by the direction of the corrosion medium cannot be reflected, the sensitivity of the experimental result to the direction is reduced, and the experimental workload is increased. Meanwhile, the length of the corrosion fracture cannot be too small, otherwise, the local stability of the corrosion test environment is too high, and the sample wafer is too sensitive to the corrosion environment, so that the result discreteness is too large. Therefore, the fracture length is required to be not less than 40 mm. (2) An included angle between the motion direction of the corrosion control corrosion medium and the normal direction of the surface of the octagonal three-dimensional sample wafer is not less than 80 degrees, and an included angle between the motion direction of the corrosion medium and one edge of the octagonal three-dimensional sample wafer is not less than 80 degrees; this is due to: in the corrosion test, the direction of movement of the corrosion medium should be as parallel as possible to the surface of the coating, i.e. as perpendicular as possible to the normal of the surface of the coating, in order to maximize the corrosion effect at the fracture site, rather than a significant erosion of the surface of the coating. In the embodiment of the invention, the included angle between the motion direction of the corrosion medium and the normal line of the surface of the coating is required to be not less than 80 degrees. If the included angle is too small, on one hand, the corrosion damage of the surface sealing area of the coating is easy to occur, and on the other hand, the corrosion degree of the cross section is reduced. In addition, eight sides of the corrosion sample wafer are all fracture surfaces, the movement direction of the corrosion medium is perpendicular to one side as much as possible, the included angle between the corrosion medium and one side is not less than 80 degrees in the embodiment of the invention, so that the fracture surface of the side is subjected to the maximum corrosion medium corrosion effect, and the fracture surfaces of other sides are subjected to corrosion less than the fracture surface. If the fracture cannot be perpendicular, the two fractures are easy to reach the maximum corrosion effect, so that the judgment is interfered. In conclusion, the method provided by the embodiment of the invention can realize reliable evaluation on the fracture corrosion resistance of the plated steel plate, and is simple to operate and high in reliability.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic view of an octagonal relief swatch surface;
FIG. 2 is a schematic fracture view of an octagonal sample;
FIG. 3 is a schematic view of a corrosion test;
FIG. 4 is a schematic view of the change in fracture morphology before and after etching;
FIG. 5 is a schematic view of a fracture numbering;
FIG. 6 is a flowchart of a method for evaluating fracture corrosion resistance of a plated steel sheet according to the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In order to solve the technical problems, the embodiment of the invention provides the following general ideas:
in order to achieve the above object, the present embodiment provides a method for evaluating fracture corrosion resistance of a plated steel sheet, as shown in fig. 6, comprising:
s1, processing a to-be-detected plated steel plate sample to obtain an octagonal three-dimensional sample wafer, wherein the side length of the longitudinal section of the octagonal three-dimensional sample wafer is more than or equal to 40 mm;
s2, sealing the octagonal three-dimensional sample wafer, and then placing the octagonal three-dimensional sample wafer in a moving corrosion medium for corrosion test to enable the longitudinal section of the three-dimensional sample wafer to generate red corrosion products, so as to obtain the octagonal three-dimensional sample wafer containing the red corrosion products; an included angle formed by the motion direction of the corrosive medium and the normal direction of the surface of the octagonal three-dimensional sample wafer is not less than 80 degrees, and an included angle formed by the motion direction of the corrosive medium and one side of the octagonal three-dimensional sample wafer is not less than 80 degrees;
s3, photographing the longitudinal section of the octagonal stereoscopic sample containing the red corrosion product to obtain a longitudinal section picture of the octagonal stereoscopic sample;
s4, obtaining the ratio S of the area occupied by the red corrosion products to the total area of the longitudinal section according to the longitudinal section picture of the octagonal stereoscopic sample waferi；
S5, according to the ratio SiThe corrosion resistance of the coated steel sheet at the fracture was evaluated.
The invention provides an evaluation method of fracture corrosion resistance of a coated steel plate, which has the following principle:
in the practical use process of the coated steel plate, the action direction of the corrosion medium on the fracture of the coated steel plate can be changed continuously, so that the direction of the corrosion medium on the fracture is an important index for evaluating the corrosion of the fracture. Therefore, the octagonal sample wafer is designed, so that the corrosion tests in a plurality of corrosion medium acting directions can be simultaneously carried out on the same sample wafer. The influence of different corrosion medium directions is difficult to be reflected completely by the traditional quadrilateral sample wafer, and the discreteness of the test result of the symmetrical edge is overlarge. However, if the number of edges is larger, the corrosion difference of the fracture in the adjacent direction is further reduced, the corrosion difference caused by the direction of the corrosion medium cannot be reflected, the sensitivity of the experimental result to the direction is reduced, and the experimental workload is increased. Meanwhile, the length of the corrosion fracture cannot be too small, otherwise, the local stability of the corrosion test environment is too high, and the sample wafer is too sensitive to the corrosion environment, so that the result discreteness is too large. Therefore, the fracture length is required to be not less than 40 mm.
In the corrosion test, the direction of movement of the corrosion medium should be as parallel as possible to the surface of the coating, i.e. as perpendicular as possible to the normal of the surface of the coating, in order to maximize the corrosion effect at the fracture site, rather than a significant erosion of the surface of the coating. The invention requires that the angle between the moving direction of the corrosion medium and the normal of the surface of the coating is not less than 80 degrees. If the included angle is too small, on one hand, the corrosion damage of the surface sealing area of the coating is easy to occur, and on the other hand, the corrosion degree of the cross section is reduced. In addition, eight sides of the corrosion sample wafer are all fracture surfaces, the motion direction of a corrosion medium is perpendicular to one side as much as possible, the included angle between the corrosion medium and one side is not less than 80 degrees, the fracture surface of the side is subjected to the maximum corrosion medium corrosion effect, and the corrosion on the fracture surfaces of other sides is less than that of the fracture surface. If the fracture cannot be perpendicular, the two fractures are easy to reach the maximum corrosion effect, so that the judgment is interfered.
In a preferred embodiment, the moving direction of the etching medium forms an included angle of greater than or equal to 85 ° with the normal direction of the surface of the octagonal stereoscopic sample wafer. An included angle formed by the motion direction of the corrosive medium and one edge of the octagonal stereoscopic sample wafer is more than or equal to 85 degrees; the closer the angle is to 90 the better the effect.
The surface normal direction of the octagonal stereoscopic sample wafer is the vertical direction of a plane, and an included angle formed by the motion direction of the corrosive medium and the surface normal direction of the octagonal stereoscopic sample wafer is a non-obtuse angle.
The moving corrosive medium specifically comprises one of acid, alkali and salt, and can be in a gas form or a liquid form.
In a preferred embodiment, the octagonal stereoscopic sample is a regular octagonal stereoscopic sample. The better the sensitivity of the experimental results to direction, the smaller the discreteness.
As an optional implementation mode, the burr length L of each side of the octagonal stereoscopic sample wafer is less than or equal to 1/3, and L is less than or equal to 1 mm.
In order to obtain a fracture corrosion sample, the original plated steel plate must be processed. However, in order to fully characterize the corrosion resistance of the fracture, no significant corrosion-influencing factors should be caused during processing. On the one hand, the coating at the fracture site cannot be damaged in the processing, including but not limited to coating peeling, delamination, thinning, holes and the like. On the other hand, in fracture processing, the length of burrs on the fracture cannot be too long, otherwise sharp burrs can become a weak point of corrosion, and the corrosion resistance of the burrs is evaluated instead of the corrosion resistance of the fracture. In addition, in practical application, the fracture burrs are required to be controlled within a certain range during cutting and processing, so that the use requirement can be met. Experience shows that the corrosion resistance of the fracture of the coated steel plate mainly comes from the galvanic protection effect and the corrosion product coverage effect of the fracture coating on the fractured steel plate. Both effects diminish as the burr length increases. Therefore, it is required that the burr length cannot exceed one third of the thickness of the steel sheet while its absolute value does not exceed 1 mm. If the burr is too long, it causes the fracture to corrode abnormally rapidly, so that red corrosion products at the fracture site increase.
After the steel plate is processed, the plating layer near the fracture does not have the damages of peeling, layering, thinning, holes and the like. And in the corrosion test process, the insulating sealing material in the sealing area cannot be damaged by peeling, delamination, bubbling and the like. In performing the fracture corrosion test, the influence of the corrosion product formed by the corrosion of the surface of the plated steel sheet on the fracture should be avoided, and thus the surface sealing treatment is required. The insulating sealing material used in sealing should have good adhesion, insulation, etc. so that no damage such as peeling, delamination, bubbling, etc. occurs throughout the corrosion test period. If the seal area is damaged, the coated steel sheet at the damaged position can be corroded, the corrosion of the fracture can be accelerated, and the red corrosion products at the fracture position are increased.
As an alternative embodiment, the appearance graph of the fracture adopts a camera device with the resolution being more than or equal to 512 pixels/mm.
After the corrosion test is completed, all fractures are evaluated for morphology. This evaluation should be based on the analysis of the pictures taken of the fractures, each of which is to be taken, which contain each position of the fracture. On the shot picture, the area proportion occupied by the red corrosion product at the fracture position is counted. And finally, comprehensively evaluating the corrosion resistance of the coated steel plate fracture according to the area occupied by the red corrosion product of each fracture. In order to be able to accurately record the position and area of the red corrosion product, the resolution of the picture cannot be too small, and the resolution is required to be not less than 512 pixels/mm. If the pixels are insufficient, the picture is blurred, statistical deviation occurs, the area without red corrosion products is counted, and the statistical result is larger.
As an alternative embodiment, it is also possible to envisage that, on each side, the ratio S of the area occupied by the red corrosion products to the longitudinal section area of each sideiCarrying out evaluation;
according to the ratio SiEvaluating the corrosion resistance of the coated steel plate fracture, comprising:
the ratio SiThe smaller the corrosion resistance, the better.
In addition, the evaluation method of the fracture corrosion resistance of the coated steel plate provided by the embodiment of the invention is also evaluated, and the evaluation method comprises the following steps:
(1) the discrete type calculation method comprises the following steps:
obtaining the ratio S of the ith edgeiAnd the ratio S of the j-th edgejThe ith side and the jth side are two symmetrical sides;
according to said ratio SiAnd the ratio S of the j-th edgejObtaining a coefficient of variation delta;
and evaluating the discreteness of the test result according to the variation coefficient delta so as to evaluate the corrosion resistance of the coated steel plate fracture.
Wherein, the symmetrical edge specifically includes:
if N is an even number, the side numbered as i and the side numbered as 2N +2-i are symmetrical sides, wherein i is more than 1 and less than N/2+ 1;
if N is an odd number, the side numbered as i and the side numbered as 2N +2-i are symmetrical sides, wherein i is more than 1 and less than or equal to (N + 1)/2;
according to the ratio SiAnd the ratio S of the j-th edgejObtaining a coefficient of variation delta, specifically:
the smaller the coefficient of variation δ, the better the dispersion.
(2) The sensitivity calculation method comprises the following steps:
according to said ratio SiObtaining an average of the differences between the area ratios of the red corrosion products of adjacent fractures
And average value of area ratio of red corrosion products
According to the mean value
And SiObtaining a sensitivity value m;
according to the sensitivity value m, the corrosion resistance of the fracture of the plated steel plate is evaluated.
Wherein the mean value is
And SiObtaining a sensitivity value m, specifically:
the greater the sensitivity, the better the corrosion resistance.
The method for evaluating the fracture corrosion resistance of the plated steel plate provided by the embodiment of the invention can realize reliable evaluation of the fracture corrosion resistance of the plated steel plate, and is simple to operate and high in reliability.
The method for evaluating the fracture corrosion resistance of a plated steel sheet according to the present application will be described in detail with reference to examples, comparative examples and experimental data.
Step S1, processing a steel plate sample of the coating to be detected to obtain octagonal solid sample wafers with each side length being more than or equal to 40 mm; wherein, the characteristics of the sample pieces of the examples and comparative examples are shown in table 1;
TABLE 1
Step S2, sealing the octagonal three-dimensional sample wafer, and then putting the octagonal three-dimensional sample wafer into a corrosion medium for corrosion test to obtain an octagonal three-dimensional sample wafer containing red corrosion products; obtaining a longitudinal section picture of the octagonal stereoscopic sample after photographing; obtaining the ratio S of the area occupied by the red corrosion products on each edge to the surface area on each edge according to the topographyi(ii) a Wherein, the corrosion test parameters of the examples and comparative examples are shown in table 2;
TABLE 2
The fracture evaluation after the corrosion test is shown in table 3. The test method is a neutral salt spray test. Marking the edge which faces the motion direction of the corrosive medium and has the largest included angle in the corrosion test as 1, and then numbering clockwise in sequence, wherein the largest number is N and is the same as the number of the edges, as shown in FIG. 5. If N is an even number, the edge numbered i and the edge numbered 2N +2-i are symmetric edges, where i is greater than 1 and less than N/2+ 1. If N is an odd number, the edge numbered i and the edge numbered 2N +2-i are symmetric edges, wherein i is greater than 1 and less than or equal to (N + 1)/2. Analyzing by adopting an image method to obtain the proportion Si of the red corrosion products of each fracture edge, and using the average value of the area proportion variation coefficients delta of the red corrosion products of all symmetrical edges
To show the dispersion of the test results, wherein the coefficient of variation δ of the ratio of red corrosion products of the two symmetrical sides i and j is expressed as:
using average of differences in the area ratios of red corrosion products of adjacent fractures
The ratio to the average of the area ratios of red corrosion products indicates the sensitivity of the test results to the direction of the corrosion medium.
TABLE 3
As can be seen from the data in Table 3:
in the comparative example 1, the side length in the sample is 20mm, which is smaller than the range of more than or equal to 40mm in the embodiment of the invention, the rest is the same as the embodiment 1, the dispersion is large, and the variation coefficient delta reaches 5 percent;
in the comparative example 2, the included angle between the corrosion medium and the normal direction of the surface of the coating is 70 degrees, the included angle between the corrosion medium and the edge is 60 degrees, the range of the embodiment of the invention is smaller, the dispersion is large, and the variation coefficient delta reaches 24 percent;
in the comparative example 3, the included angle between the corrosion medium and the normal direction of the surface of the coating is 65 degrees, which is smaller than the range of the embodiment of the invention, and the dispersion is large; meanwhile, the plating thickness and the steel plate thickness of the comparative example 3 are the same as those of the example 3, but the edge burr length of the comparative example 3 exceeds the range of the example, so that the area ratio of red corrosion products at the edge is obviously higher than that of the example 3.
In the comparative example 4, the sample wafer is triangular, the included angles between the corrosion medium and the normal direction of the surface of the coating are 65 degrees respectively, the range is smaller than that of the embodiment of the invention, the dispersion is large, and the variation coefficient delta reaches 11 percent;
in the comparative example 5, the included angle between the corrosion medium and the normal direction of the surface of the coating is 70 degrees, which is smaller than the range of the embodiment of the invention, the dispersion is large, and the variation coefficient delta reaches 6 percent;
in the comparative example 6, the sample is decagon, the side length is 30mm, the range is smaller than the range of more than or equal to 40mm in the embodiment of the invention, the dispersion is large, and the variation coefficient delta reaches 8%;
in the comparative example 7, the sample wafer is hexagonal, the side length is 20mm, the range is smaller than the range of more than or equal to 40mm in the embodiment of the invention, the dispersion is large, and the variation coefficient delta reaches 9 percent;
in the comparative example 8, the sample is decagon, the side length is 20mm, the range is smaller than the range of more than or equal to 40mm in the embodiment of the invention, the dispersion is large, and the variation coefficient delta reaches 8%;
in the embodiments 1 to 8, all the parameters (the fracture length is not less than 40mm, the included angle between the motion direction of the corrosion medium and the normal line of the surface of the coating is not less than 80 °, the included angle between the corrosion medium and one of the edges is not less than 80 °, the burr length L of each edge is not more than 1/3, and L is not more than 1mm) are within the range of the embodiment of the present invention, the dispersion is small, the sensitivity is good, and it is shown that the evaluation method for the fracture corrosion resistance of the coated steel plate provided by the embodiment of the present invention can realize reliable evaluation for the fracture corrosion resistance of the coated steel plate, the operation is simple, and the reliability is high.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. A method for evaluating fracture corrosion resistance of a plated steel sheet, comprising:
processing a to-be-detected plated steel plate sample to obtain an octagonal three-dimensional sample wafer, wherein the side length of the longitudinal section of the octagonal three-dimensional sample wafer is more than or equal to 40 mm;
sealing the octagonal three-dimensional sample wafer, and then placing the octagonal three-dimensional sample wafer in a moving corrosion medium for corrosion test to enable the longitudinal section of the three-dimensional sample wafer to generate a red corrosion product, so as to obtain the octagonal three-dimensional sample wafer containing the red corrosion product; an included angle formed by the motion direction of the corrosive medium and the normal direction of the surface of the octagonal three-dimensional sample wafer is not less than 80 degrees, and an included angle formed by the motion direction of the corrosive medium and one side of the octagonal three-dimensional sample wafer is not less than 80 degrees;
photographing the longitudinal section of the octagonal stereoscopic sample containing red corrosion products to obtain a longitudinal section picture of the octagonal stereoscopic sample;
obtaining the ratio S of the area occupied by the red corrosion products to the total area of the longitudinal section according to the longitudinal section picture of the octagonal three-dimensional sample waferi；
According to said ratio SiThe corrosion resistance of the coated steel sheet at the fracture was evaluated.
2. The method of claim 1, wherein burrs are formed on each side of the octagonal three-dimensional sample.
3. The method of claim 2, wherein the burr length L is not more than 1/3 and L is not more than 1 mm.
4. The method according to claim 1, wherein the photographing is performed by using a camera device having a resolution of 512 pixels/mm or more.
5. The method of claim 1, wherein the corrosive medium comprises one of a neutral salt spray, an acid salt spray and simulated seawater.
6. The method of claim 1, wherein the octagonal solid sample is a regular octagonal solid sample.
7. The method of claim 1, wherein an included angle formed by the motion direction of the corrosive medium and the normal direction of the surface of the octagonal solid sample piece is a non-obtuse angle.
8. The method for evaluating the fracture corrosion resistance of the coated steel plate according to claim 1, wherein an included angle formed by the motion direction of the corrosion medium and the normal direction of the surface of the octagonal three-dimensional sample is not less than 85 degrees.
9. The method for evaluating the fracture corrosion resistance of the coated steel plate according to claim 1, wherein an included angle formed by the motion direction of the corrosion medium and one side of the octagonal three-dimensional sample is not less than 85 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110413582.6A CN113252542B (en) | 2021-04-16 | 2021-04-16 | Evaluation method for fracture corrosion resistance of coated steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110413582.6A CN113252542B (en) | 2021-04-16 | 2021-04-16 | Evaluation method for fracture corrosion resistance of coated steel plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113252542A true CN113252542A (en) | 2021-08-13 |
| CN113252542B CN113252542B (en) | 2022-09-09 |
Family
ID=77220972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110413582.6A Active CN113252542B (en) | 2021-04-16 | 2021-04-16 | Evaluation method for fracture corrosion resistance of coated steel plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113252542B (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1597566A2 (en) * | 2003-02-21 | 2005-11-23 | Guido D. K. De Meurechy | Method and apparatus for scanning corrosion and surface defects |
| JP2011027710A (en) * | 2009-06-30 | 2011-02-10 | Jfe Steel Corp | Method for evaluating perforation corrosivity surface-treated steel sheet |
| CN102077060A (en) * | 2008-06-04 | 2011-05-25 | G·帕特尔 | A monitoring system based on etching of metals |
| CN102830056A (en) * | 2012-08-28 | 2012-12-19 | 杭州富如德科技有限公司 | Testing component of rotary liquid-solid two-phase flow erosive wear testing device |
| CN102954929A (en) * | 2011-08-25 | 2013-03-06 | 中国石油化工股份有限公司 | Test-piece support for corrosion test |
| CN105277478A (en) * | 2014-07-15 | 2016-01-27 | 广东电网公司电力科学研究院 | Corrosion simulation method and corrosion resistance evaluation method of galvanized steel coating in industrial atmosphere environment |
| JP2016061652A (en) * | 2014-09-17 | 2016-04-25 | Ｊｆｅスチール株式会社 | Monitoring method of hydrogen amount immersed into steel material forming automobile body |
| CN107449723A (en) * | 2016-05-30 | 2017-12-08 | 宝山钢铁股份有限公司 | Water immersion area corrosion testing apparatus |
| CN108760614A (en) * | 2018-04-25 | 2018-11-06 | 上海海事大学 | The online electrochemical testing device of erosion corrosion and method |
| JP2018185184A (en) * | 2017-04-25 | 2018-11-22 | Ｊｆｅスチール株式会社 | Method for evaluating delayed fracture characteristics of high strength steel plate |
| CN111474110A (en) * | 2020-04-03 | 2020-07-31 | 常州大学 | Visual image monitoring flowing corrosion test device for bent pipe |
| CN111534777A (en) * | 2020-06-08 | 2020-08-14 | 首钢集团有限公司 | Hot-dip galvanized aluminum-magnesium coated steel plate with notch corrosion resistance and preparation method thereof |
-
2021
- 2021-04-16 CN CN202110413582.6A patent/CN113252542B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1597566A2 (en) * | 2003-02-21 | 2005-11-23 | Guido D. K. De Meurechy | Method and apparatus for scanning corrosion and surface defects |
| CN102077060A (en) * | 2008-06-04 | 2011-05-25 | G·帕特尔 | A monitoring system based on etching of metals |
| JP2011027710A (en) * | 2009-06-30 | 2011-02-10 | Jfe Steel Corp | Method for evaluating perforation corrosivity surface-treated steel sheet |
| CN102954929A (en) * | 2011-08-25 | 2013-03-06 | 中国石油化工股份有限公司 | Test-piece support for corrosion test |
| CN102830056A (en) * | 2012-08-28 | 2012-12-19 | 杭州富如德科技有限公司 | Testing component of rotary liquid-solid two-phase flow erosive wear testing device |
| CN105277478A (en) * | 2014-07-15 | 2016-01-27 | 广东电网公司电力科学研究院 | Corrosion simulation method and corrosion resistance evaluation method of galvanized steel coating in industrial atmosphere environment |
| JP2016061652A (en) * | 2014-09-17 | 2016-04-25 | Ｊｆｅスチール株式会社 | Monitoring method of hydrogen amount immersed into steel material forming automobile body |
| CN107449723A (en) * | 2016-05-30 | 2017-12-08 | 宝山钢铁股份有限公司 | Water immersion area corrosion testing apparatus |
| JP2018185184A (en) * | 2017-04-25 | 2018-11-22 | Ｊｆｅスチール株式会社 | Method for evaluating delayed fracture characteristics of high strength steel plate |
| CN108760614A (en) * | 2018-04-25 | 2018-11-06 | 上海海事大学 | The online electrochemical testing device of erosion corrosion and method |
| CN111474110A (en) * | 2020-04-03 | 2020-07-31 | 常州大学 | Visual image monitoring flowing corrosion test device for bent pipe |
| CN111534777A (en) * | 2020-06-08 | 2020-08-14 | 首钢集团有限公司 | Hot-dip galvanized aluminum-magnesium coated steel plate with notch corrosion resistance and preparation method thereof |
Non-Patent Citations (3)
| Title |
|---|
| 柳长磊 等: "腐蚀对金属材料断口的影响", 《现代制造技术与装备》 * |
| 蒋光锐 等: "锌基合金镀层钢板的耐蚀性研究", 《中国腐蚀与防护学报》 * |
| 黎敏 等: "纯锌镀层和锌铝镁合金镀层在循环盐雾中的腐蚀行为", 《第十二届中国钢铁年会论文集——4.表面与涂镀》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113252542B (en) | 2022-09-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR102028365B1 (en) | Electrodeposited copper foil with low repulsive force and manufacturing method and application thereof | |
| Sun et al. | Long-term atmospheric corrosion behaviour of aluminium alloys 2024 and 7075 in urban, coastal and industrial environments | |
| CN115901615A (en) | Method for evaluating wet adhesion of metal organic coating | |
| Hotař et al. | Fractal dimension used for evaluation of oxidation behaviour of Fe-Al-Cr-Zr-C alloys | |
| Knudsen et al. | Correlations between standard accelerated tests for protective organic coatings and field performance | |
| Keppert et al. | The effect of magnesium on the corrosion of hot‐dip galvanized steel in chloride containing environments | |
| CN113252542B (en) | Evaluation method for fracture corrosion resistance of coated steel plate | |
| CN117517325A (en) | Machine vision-based aluminum veneer spraying quality detection and analysis system | |
| EP2894455A1 (en) | Sampling jig, quantitative analysis method, and analysis system | |
| Moreira et al. | Computational image analysis as an alternative tool for the evaluation of corrosion in salt spray test | |
| Sanchez et al. | Ageing tests and long-term performance of marine antifouling coatings | |
| CN114660332B (en) | Appearance characterization method of galvanized sheet inhibition layer | |
| Flis et al. | Behaviour of intact and scratched phosphate coatings on zinc, zinc–nickel and mild steel in dilute sodium phosphate solution | |
| Nakatsugawa et al. | Effect of Al and Ca Elements on the Atmospheric Corrosion of Field-Exposed Mg–Al–Zn–Ca–Mn Magnesium Alloys | |
| Behrens et al. | Formability of an anti-fingerprint clear coating on satin stainless steel sheet metal | |
| Hayashibara et al. | Monitoring the early stage of degradation of epoxy-coated steel for ballast tank by electrochemical impedance spectroscopy | |
| JP4790563B2 (en) | Aluminum material or aluminum alloy material, and building material products using the same | |
| CN113514390B (en) | Method for testing adhesive force of automobile plate electrophoresis paint film | |
| Bastos et al. | A forming limit curve for the corrosion resistance of coil-coatings based on electrochemical measurements | |
| EP3916374A1 (en) | Method and specimen | |
| US20230168181A1 (en) | Method and specimen | |
| CN101929966A (en) | Method for evaluating adhesive force performance of coating of cold-rolled automobile plate | |
| CN112268908B (en) | Evaluation method for rust degree of iron-nickel alloy strip | |
| Winter | Laboratory Test Methods For Offshore Coatings-A Review of a Round Robin Study | |
| Olaogun et al. | Corrosion behaviour of cold‐rolled aluminium AA8015‐alloy in natural seawater at 0.18 μm surface roughness |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |