CN113514390A - Method for testing adhesive force of electrophoretic paint film of automobile plate - Google Patents
Method for testing adhesive force of electrophoretic paint film of automobile plate Download PDFInfo
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Abstract
The invention particularly relates to a method for testing the adhesive force of an electrophoretic paint film of an automobile plate, which belongs to the technical field of paint surface testing and comprises the following steps: obtaining a to-be-detected plate, wherein the to-be-detected plate is a metal plate covered with an electrophoretic paint film; immersing a plate to be tested into a boiling solution, then immersing the plate to be tested into an ice-water mixture, taking out and drying to obtain a sample to be tested; testing the adhesive force of a sample to be tested to obtain a test result; the boiling solution-ice water alternate soaking is adopted to accelerate the failure of the coating, the traditional check tool check test is combined to measure the adhesive force of the electrophoretic paint film of the automobile plate, the defects of poor discrimination, low upper limit of adhesive force detection and the like of the traditional check tool check test are avoided, and the method is simple, good in repeatability and high in measurement precision.
Description
Technical Field
The invention belongs to the technical field of paint surface testing, and particularly relates to a method for testing the adhesive force of an electrophoretic paint film of an automobile plate.
Background
The automotive industry suffers from significant losses due to corrosion annually. How to improve the corrosion resistance of automobile products has become one of the important problems facing enterprises at home and abroad. At present, pretreatment and cathode electrophoresis are main means for improving the corrosion resistance of an automobile body, and a coating system on the surface of the automobile body is one of the main measures for improving the corrosion resistance of an automobile product and prolonging the service life. Therefore, the automobile manufacturing industry has paid more and more attention to the coating of automobile products, and especially the coating of automobile bodies has become one of the core technologies in the automobile manufacturing industry. Typical automotive body coating systems consist of an electrocoat primer, a basecoat paint, and a clearcoat paint. In order to ensure that the automobile coating has good decorative effect and corrosion resistance, the white automobile body needs to be subjected to phosphating treatment before electrophoresis, and a phosphating film is formed between a coated base material and the coating to improve the binding force between the coated base material and the coating and the overall coating performance.
The adhesion between an electrophoretic paint film and an automobile plate is a main influence factor of the anticorrosion performance of the automobile, the adhesion of the paint film is measured by adopting a hundred-grid knife-scribing method in the traditional method at present, the method is simple to operate, but the applicant finds out in the invention process that: with continuous optimization of a pretreatment process and an electrophoresis process, the adhesion force of an electrophoresis paint film and an automobile plate at present exceeds the detection range of a conventional check knife grid cutting method, so that the adhesion force of the paint film tested by the check knife grid cutting method is 0 grade (representing that the cutting edge is completely smooth and no one-check falling phenomenon exists), and the discrimination is poor.
Disclosure of Invention
In view of the above problems, the present invention has been made to provide an automotive panel electrophoretic paint film adhesion test method that overcomes or at least partially solves the above problems.
The embodiment of the invention provides a method for testing the adhesion of an electrophoretic paint film of an automobile plate, which comprises the following steps:
obtaining a to-be-detected plate, wherein the to-be-detected plate is a metal plate covered with an electrophoretic paint film;
immersing the plate to be tested into a boiling solution, then immersing the plate to be tested into an ice-water mixture, taking out and drying to obtain a sample to be tested;
and carrying out adhesion test on the sample to be tested to obtain a test result.
Optionally, the plate to be tested is immersed in the boiling solution for 8-24 hours.
Optionally, the boiling solution comprises an alkali solution and NaCl, wherein the concentration of NaCl is 1% -10%, and the concentration of the alkali solution is 1%-10%; the alkali liquor comprises NaOH and NaCO3At least one of (1).
Optionally, the immersion time in the ice-water mixture is 0.5h-2 h.
Optionally, the ice-water mixture is deionized water.
Optionally, the side edge of the board to be tested is provided with a sealing edge.
Optionally, the metal plate of the plate to be tested is one of a continuous annealing plate, a hot-dip galvanized plate, an alloyed hot-dip galvanized plate, an electro-galvanized plate or a zinc-aluminum-magnesium plating plate.
Optionally, the testing the test sample to be tested specifically includes:
cutting the electrophoretic paint film of the sample to be tested to obtain a grid pattern area;
and tightly attaching the adhesive tape to the grid pattern area for adhesion test to obtain a test result.
Optionally, the grid line spacing of the grid pattern area is 0.99mm-1.01 mm.
Optionally, in the adhesion test of the adhesive tape tightly attached to the grid pattern area, the adhesive tape has an occupation force of 9N/25mm-11N/25mm, and the adhesive time of the adhesive tape is 10min-20 min.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the method for testing the adhesion force of the electrophoretic paint film of the automobile plate, provided by the embodiment of the invention, comprises the following steps: obtaining a to-be-detected plate, wherein the to-be-detected plate is a metal plate covered with an electrophoretic paint film; immersing the plate to be tested into a boiling solution, then immersing the plate to be tested into an ice-water mixture, taking out and drying to obtain a sample to be tested; performing an adhesion test on the sample to be tested to obtain a test result; the boiling solution-ice water alternate soaking is adopted to accelerate the failure of the coating, the traditional check tool check test is combined to measure the adhesive force of the electrophoretic paint film of the automobile plate, the defects of poor discrimination, low upper limit of adhesive force detection and the like of the traditional check tool check test are avoided, and the method is simple, good in repeatability and high in measurement precision.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
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 flow chart of a testing method provided by an embodiment of the invention;
FIG. 2 is a schematic diagram illustrating measurement of a board under test according to an embodiment of the present invention;
in the figure: 1-sealing an edge area by using an adhesive tape, 2-testing a board to be tested, and 3-grid pattern area;
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.
The adhesion between an electrophoretic paint film and an automobile plate is a main influence factor of the anticorrosion performance of the automobile, the adhesion of the paint film is measured by adopting a hundred-grid knife-scribing method in the traditional method at present, the method is simple to operate, but the applicant finds out in the invention process that: with continuous optimization of a pretreatment process and an electrophoresis process, the adhesive force of an electrophoretic paint film and an automobile plate at present exceeds the detection range of a conventional check knife grid cutting method, so that the adhesive force of the paint film tested by the check knife grid cutting method is 0 grade (representing that the cutting edge is completely smooth and no one-check falling phenomenon exists), and the discrimination is poor; therefore, the embodiment of the application provides a method for testing the adhesion of an electrophoretic paint film of an automobile plate.
According to an exemplary embodiment of the invention, a method for testing the adhesion of an electrophoretic paint film on an automobile plate is provided, and the method comprises the following steps:
s1, obtaining a to-be-detected plate, wherein the to-be-detected plate is a metal plate covered with an electrophoretic paint film, in other words, the to-be-detected plate is a metal plate + pretreatment film + electrophoretic paint film coating system; in the embodiment, the length of the plate to be detected is 100mm-200mm, and the width is 50mm-120 mm; optionally, the metal plate of the plate to be tested is one of the common automobile metal substrates such as a continuous annealing plate, a hot-dip galvanized plate, an alloyed hot-dip galvanized plate, an electro-galvanized plate or a zinc-aluminum-magnesium plated plate
S2, immersing the plate to be tested into a boiling solution, immersing the plate to be tested into an ice-water mixture, taking out and drying to obtain a sample to be tested;
s3, testing the adhesive force of the sample to be tested to obtain a test result;
s3.1, cutting an electrophoresis paint film of a sample to be tested to obtain a grid pattern area; in this embodiment, the method specifically includes: forming a group of parallel cutting lines on the electrophoresis plate by adopting a hundred-grid knife, wherein all the cutting lines are cut through to the metal plate substrate, repeating the operation, and cutting a group of intersected parallel lines in the direction forming an angle of 90 degrees with the original group of parallel cutting lines to form a grid pattern; since the thickness of the electrophoretic paint film is usually 15 μm to 30 μm, the blade edge spacing of the hundred-grid knife is 1mm (+0.01 mm). Slightly sweeping away the residual paint film on the grid pattern by using a soft brush;
s3.2, tightly attaching the adhesive tape to the grid pattern area to perform an adhesion test to obtain a test result; the samples were carefully examined for delamination of the coating in the cross-cut areas and the adhesion of the top coat film to be examined was rated according to GB/T9286-1998 test for cross-cuts of paint and clear coat films.
As an optional implementation mode, the plate to be detected is immersed in boiling solution at the temperature of 100 ℃ for 8-24 h, specifically, the boiling solution comprises NaOH and NaCl, wherein the concentration of NaCl is 1-10%, and the concentration of NaOH is 1-10%.
The reason why the solution is boiling is to make the paint film swell by absorbing water, accelerating the deterioration of the paint film; the reason that the immersion time is 8h-24h is determined by the failure degree of the paint film in boiling water, the adverse effect of excessively small time is that the coating is not obviously degraded, the subsequent measurement result is not obviously distinguished, and the excessive adverse effect is that the coating is seriously degraded and is not beneficial to the subsequent measurement.
The NaCl environment has strong paint film penetration, the reason that the concentration of NaCl is 1% -10% is to obtain the best coating degradation process, the adverse effect of too small concentration is that the paint film fails slowly, and the adverse effect of too large concentration is that the solute in the solution is separated out seriously.
NaOH can provide alkaline environment, the alkaline environment can accelerate the dissolution failure of the pretreatment membrane, and the substance capable of replacing NaOH comprises NaCO3The reason for the concentration of NaOH being 1-10% is to obtain an optimal coating degradation process, too large a concentration has the adverse effect that the coating fails more quickly and too small a concentration has the adverse effect that the coating fails more slowly.
As an alternative embodiment, the sample is immersed in an ice-water mixture for 0.5h-2h, specifically, the ice-water mixture is deionized water, and after the required time is reached, the sample is taken out, the residual water on the surface is wiped, and the sample is kept still in a dryer for 24 h.
The reasons for immersion in the ice-water mixture are: the electrophoretic paint film and the automobile plate have larger difference in thermal expansion coefficient, certain thermal stress is generated between the electrophoretic paint film and the automobile plate after high-low temperature alternating environment, the paint film adhesive force is further deteriorated, the reason that the immersion time is 0.5h-2h is to accelerate the test efficiency, the adverse effect of overlarge time value is that the test period is longer, and the adverse effect of undersize value is that the coating is completely cooled. In the drying process, a small amount of water absorbed by a paint film in the swelling process can volatilize, the external condition of dry-wet circulation can cause the electrophoresis paint film to expand and contract and form internal stress, the adhesive force of the paint film can be degraded to a certain degree, the reason that the drying time is 24 hours is to fully volatilize the water in the coating, the adverse effect of overlarge time value is that the operator is inconvenient in time and wastes time, and the adverse effect of undersize is that the water is not fully volatilized.
As an optional implementation manner, the side edge of the board to be tested is provided with an edge seal, specifically, four edges of the board to be tested are sealed by using a high temperature resistant adhesive tape.
The purpose of the edge sealing is to protect the automobile plate with a thin electrophoretic paint film from paint film cracking and corrosion in the boiling solution boiling process, so that the accuracy of the test is prevented from being influenced.
As an optional implementation mode, in the adhesion force test of the adhesive tape which is tightly attached to the grid pattern area, the occupation force of the adhesive tape is 9N/25mm-11N/25mm, and the adhesion time of the adhesive tape is 10min-20 min. The adhesive force of the adhesive tape is (10 +/-1) N/25mm, which is to ensure uniform and controllable adhesive force.
The following will explain the method for testing the adhesion of the electrophoretic paint film of the automobile plate in detail by combining the examples, the comparative examples and the experimental data.
Example 1
And (3) a board to be tested: DC04(200mm x 100mm) + pacaka phosphating + PPG cathode electrophoresis;
s1, sealing four sides of a board to be detected by adopting a new Hongson brand golden finger high-temperature-resistant adhesive tape, immersing the sealed edge 5mm away from the edge in a boiling solution for boiling for 8 hours, wherein the solution is 2% (wt) NaOH + 2% (wt) NaCl, taking out a sample after the required time is up, immediately immersing the sample in an ice-water mixture for soaking for 1 hour, taking out the sample after the required time is up, wiping off residual moisture on the surface, and standing for 24 hours in a dryer.
S2, forming a group of parallel cutting lines on the to-be-tested plate by adopting a QFH-A hundred-grid knife, scratching all the cutting lines to the metal plate substrate, repeating the operation, and scratching a group of intersected parallel lines in the direction forming an angle of 90 degrees with the original group of cut parallel lines to form a grid pattern.
S3, the center point of the adhesive tape for testing is placed above the grid, the direction of the center point is parallel to one group of cutting lines, and then the adhesive tape is pressed above the grid area by fingers. In order to ensure that the adhesive tape is in good contact with the coating, the adhesive tape is lightly rubbed by a card to be tightly attached to the surface of the electrophoretic paint film. After applying the adhesive tape for 10min, the sample was fixed with one hand and one end of the adhesive tape was held with the other hand, and the adhesive tape was torn off smoothly within 1.0s at an angle as close to 60 ° as possible, to obtain a test result.
Example 2
And (3) a board to be tested: DP980(200mm x 100mm) + ppa phosphorization + PPG cathode electrophoresis;
s1, sealing four sides of a board to be detected by adopting a new Hongson brand golden finger high-temperature-resistant adhesive tape, immersing the sealed edge 5mm away from the edge in a boiling solution for boiling for 8 hours, wherein the solution is 2% (wt) NaOH + 2% (wt) NaCl, taking out a sample after the required time is up, immediately immersing the sample in an ice-water mixture for soaking for 1 hour, taking out the sample after the required time is up, wiping off residual moisture on the surface, and standing for 24 hours in a dryer.
S2, forming a group of parallel cutting lines on the to-be-tested plate by adopting a QFH-A hundred-grid knife, scratching all the cutting lines to the metal plate substrate, repeating the operation, and scratching a group of intersected parallel lines in the direction forming an angle of 90 degrees with the original group of cut parallel lines to form a grid pattern.
S3, the center point of the adhesive tape for testing is placed above the grid, the direction of the center point is parallel to one group of cutting lines, and then the adhesive tape is pressed above the grid area by fingers. In order to ensure that the adhesive tape is in good contact with the coating, the adhesive tape is lightly rubbed by a card to be tightly attached to the surface of the electrophoretic paint film. After applying the adhesive tape for 10min, the sample was fixed with one hand and one end of the adhesive tape was held with the other hand, and the adhesive tape was torn off smoothly within 1.0s at an angle as close to 60 ° as possible, to obtain a test result.
Example 3
And (3) a board to be tested: DC04(200mm x 100mm) + han gao thin film + basf cathode electrophoresis;
s1, sealing four sides of a board to be detected by adopting a new Hongson brand golden finger high-temperature-resistant adhesive tape, immersing the sealed edge 5mm away from the edge in a boiling solution for boiling for 16h, wherein the solution is 5% (wt) NaOH + 5% (wt) NaCl, taking out a sample after the required time is up, immediately immersing the sample in an ice-water mixture for soaking for 1h, taking out the sample after the required time is up, wiping off residual moisture on the surface, and standing for 24h in a dryer.
S2, forming a group of parallel cutting lines on the to-be-tested plate by adopting a QFH-A hundred-grid knife, scratching all the cutting lines to the metal plate substrate, repeating the operation, and scratching a group of intersected parallel lines in the direction forming an angle of 90 degrees with the original group of cut parallel lines to form a grid pattern.
S3, the center point of the adhesive tape for testing is placed above the grid, the direction of the center point is parallel to one group of cutting lines, and then the adhesive tape is pressed above the grid area by fingers. In order to ensure that the adhesive tape is in good contact with the coating, the adhesive tape is lightly rubbed by a card to be tightly attached to the surface of the electrophoretic paint film. After applying the adhesive tape for 20min, the sample was fixed with one hand and one end of the adhesive tape was held with the other hand and the tape was torn off smoothly within 1.0s at an angle as close to 60 ° as possible to obtain a test result.
Example 4
And (3) a board to be tested: DX54D + ZF (200mm 100mm) + Hangao film + Pasteur cathode electrophoresis;
s1, sealing four sides of a board to be detected by adopting a new Hongson brand golden finger high-temperature-resistant adhesive tape, immersing the sealed edge 5mm away from the edge in a boiling solution for boiling for 16h, wherein the solution is 5% (wt) NaOH + 5% (wt) NaCl, taking out a sample after the required time is up, immediately immersing the sample in an ice-water mixture for soaking for 1h, taking out the sample after the required time is up, wiping off residual moisture on the surface, and standing for 24h in a dryer.
S2, forming a group of parallel cutting lines on the to-be-tested plate by adopting a QFH-A hundred-grid knife, scratching all the cutting lines to the metal plate substrate, repeating the operation, and scratching a group of intersected parallel lines in the direction forming an angle of 90 degrees with the original group of cut parallel lines to form a grid pattern.
S3, the center point of the adhesive tape for testing is placed above the grid, the direction of the center point is parallel to one group of cutting lines, and then the adhesive tape is pressed above the grid area by fingers. In order to ensure that the adhesive tape is in good contact with the coating, the adhesive tape is lightly rubbed by a card to be tightly attached to the surface of the electrophoretic paint film. After applying the adhesive tape for 20min, the sample was fixed with one hand and one end of the adhesive tape was held with the other hand and the tape was torn off smoothly within 1.0s at an angle as close to 60 ° as possible to obtain a test result.
Comparative example 1
And (3) a board to be tested: DC04(200mm x 100mm) + pacaka phosphating + PPG cathode electrophoresis;
s1, forming a group of parallel cutting lines on a to-be-tested plate by adopting a QFH-A hundred-grid knife, scratching all the cutting lines to the metal plate substrate, repeating the operation, and scratching a group of intersected parallel lines in the direction forming an angle of 90 degrees with the original group of cut parallel lines to form a grid pattern.
S2, the center point of the adhesive tape for testing is placed above the grid, the direction of the center point is parallel to one group of cutting lines, and then the adhesive tape is pressed above the grid area by fingers. In order to ensure that the adhesive tape is in good contact with the coating, the adhesive tape is lightly rubbed by a card to be tightly attached to the surface of the electrophoretic paint film. After applying the adhesive tape for 10min, the sample was fixed with one hand and one end of the adhesive tape was held with the other hand, and the adhesive tape was torn off smoothly within 1.0s at an angle as close to 60 ° as possible, to obtain a test result.
Comparative example 2
And (3) a board to be tested: DP980(200mm x 100mm) + ppa phosphorization + PPG cathode electrophoresis;
s1, forming a group of parallel cutting lines on a to-be-tested plate by adopting a QFH-A hundred-grid knife, scratching all the cutting lines to the metal plate substrate, repeating the operation, and scratching a group of intersected parallel lines in the direction forming an angle of 90 degrees with the original group of cut parallel lines to form a grid pattern.
S2, the center point of the adhesive tape for testing is placed above the grid, the direction of the center point is parallel to one group of cutting lines, and then the adhesive tape is pressed above the grid area by fingers. In order to ensure that the adhesive tape is in good contact with the coating, the adhesive tape is lightly rubbed by a card to be tightly attached to the surface of the electrophoretic paint film. After applying the adhesive tape for 10min, the sample was fixed with one hand and one end of the adhesive tape was held with the other hand, and the adhesive tape was torn off smoothly within 1.0s at an angle as close to 60 ° as possible, to obtain a test result.
Comparative example 3
And (3) a board to be tested: DC04(200mm x 100mm) + han gao thin film + basf cathode electrophoresis;
s1, forming a group of parallel cutting lines on a to-be-tested plate by adopting a QFH-A hundred-grid knife, scratching all the cutting lines to the metal plate substrate, repeating the operation, and scratching a group of intersected parallel lines in the direction forming an angle of 90 degrees with the original group of cut parallel lines to form a grid pattern.
S2, the center point of the adhesive tape for testing is placed above the grid, the direction of the center point is parallel to one group of cutting lines, and then the adhesive tape is pressed above the grid area by fingers. In order to ensure that the adhesive tape is in good contact with the coating, the adhesive tape is lightly rubbed by a card to be tightly attached to the surface of the electrophoretic paint film. After applying the adhesive tape for 20min, the sample was fixed with one hand and one end of the adhesive tape was held with the other hand and the tape was torn off smoothly within 1.0s at an angle as close to 60 ° as possible to obtain a test result.
Comparative example 4
And (3) a board to be tested: DX54D + ZF (200mm 100mm) + Hangao film + Pasteur cathode electrophoresis;
s1, forming a group of parallel cutting lines on a board to be tested by adopting a QFH-A hundred-grid knife, scratching all the cutting lines to the metal matrix, repeating the operation, and scratching a group of intersected parallel lines in the direction forming an angle of 90 degrees with the original group of parallel cutting lines to form a grid pattern.
S2, the center point of the adhesive tape for testing is placed above the grid, the direction of the center point is parallel to one group of cutting lines, and then the adhesive tape is pressed above the grid area by fingers. In order to ensure that the adhesive tape is in good contact with the coating, the adhesive tape is lightly rubbed by a card to be tightly attached to the surface of the electrophoretic paint film. After applying the adhesive tape for 20min, the sample was fixed with one hand and one end of the adhesive tape was held with the other hand and the tape was torn off smoothly within 1.0s at an angle as close to 60 ° as possible to obtain a test result.
The test results of examples 1 to 4 and comparative examples 1 to 4 are shown in the following table.
| Paint film adhesion rating | |
| Example 1 | |
| Example 2 | |
| Example 3 | |
| Example 4 | |
| Comparative example 1 | Level 0 |
| Comparative example 2 | Level 0 |
| Comparative example 3 | Level 0 |
| Comparative example 4 | Level 0 |
From the data in examples 1-4, it can be seen that: the test method provided by the embodiment of the invention has obvious discrimination when being used for testing the board to be tested. From the data of the examples and comparative examples it can be seen that: by adopting the test method provided by the embodiment of the invention, the upper limit of adhesion detection is obviously improved, the method can be suitable for testing the conventional electrophoretic paint film automobile plate, and has good discrimination and high test precision.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
in the embodiment of the invention, boiling solution-ice water alternate soaking is adopted to accelerate coating failure, the traditional check tool check test is combined to measure the adhesive force of the electrophoretic paint film of the automobile plate, the defects of poor discrimination, low upper limit of adhesive force detection and the like of the traditional check tool check test are avoided, and the method is simple, good in repeatability and high in measurement precision.
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 (10)
1. An automobile plate electrophoretic paint film adhesion testing method is characterized by comprising the following steps:
obtaining a to-be-detected plate, wherein the to-be-detected plate is a metal plate covered with an electrophoretic paint film;
immersing the plate to be tested into a boiling solution, then immersing the plate to be tested into an ice-water mixture, taking out and drying to obtain a sample to be tested;
and carrying out adhesion test on the sample to be tested to obtain a test result.
2. The method for testing the adhesion of the electrophoretic paint film on the automobile plate as claimed in claim 1, wherein the plate to be tested is immersed in a boiling solution for 8-24 h.
3. The method for testing the adhesive force of the automobile plate electrophoretic paint film according to claim 1, wherein the boiling solution comprises alkali liquor and NaCl, wherein the concentration of NaCl is 1% -10%, and the concentration of the alkali liquor is 1% -10%; the alkali liquor comprises NaOH and NaCO3At least one of (1).
4. The method for testing the adhesion of an electrophoretic paint film on an automobile plate as claimed in claim 1, wherein the immersion time is 0.5h-2h in the ice-water mixture.
5. The method for testing the adhesion of an electrophoretic paint film on an automobile plate as claimed in claim 1, wherein the ice-water mixture is deionized water.
6. The method for testing the adhesive force of the electrophoretic paint film on the automobile plate as recited in claim 1, wherein the side edge of the plate to be tested is provided with an edge seal.
7. The method for testing the adhesion of an electrophoretic paint film on an automobile plate as claimed in claim 1, wherein the metal plate of the plate to be tested is one of a continuous annealing plate, a hot-dip galvanized plate, an alloyed hot-dip galvanized plate, an electro-galvanized plate or a zinc-aluminum-magnesium plating plate.
8. The method for testing the adhesive force of the electrophoretic paint film on the automobile plate according to claim 1, wherein the step of testing the sample to be tested specifically comprises the following steps:
cutting the electrophoretic paint film of the sample to be tested to obtain a grid pattern area;
and tightly attaching the adhesive tape to the grid pattern area for adhesion test to obtain a test result.
9. The method for testing the adhesion of an electrophoretic paint film on an automobile panel as claimed in claim 8, wherein the grid line spacing of the grid pattern region is 0.99mm to 1.01 mm.
10. The method for testing the adhesive force of the electrophoretic paint film on the automobile plate as claimed in claim 8, wherein in the adhesion test of the adhesive tape tightly attached to the grid pattern area, the occupation force of the adhesive tape is 9N/25mm-11N/25mm, and the adhesion time of the adhesive tape is 10min-20 min.
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| US5763191A (en) * | 1990-12-12 | 1998-06-09 | Boehringer Mannheim Gmbh | Universal binding film |
| CN101504403A (en) * | 2009-03-23 | 2009-08-12 | 西南铝业（集团）有限责任公司 | Detection of roller coat chromizing membrane evenness by water cooking method |
| US20170121841A1 (en) * | 2014-07-17 | 2017-05-04 | Henkel Ag & Co. Kgaa | Electroceramic Coating for Magnesium Alloys |
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2021
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| CN113514390B (en) | 2023-06-13 |
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