CN107167422B - Method for detecting adhesion of zinc layer of automobile sheet - Google Patents
Method for detecting adhesion of zinc layer of automobile sheet Download PDFInfo
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- CN107167422B CN107167422B CN201710187945.2A CN201710187945A CN107167422B CN 107167422 B CN107167422 B CN 107167422B CN 201710187945 A CN201710187945 A CN 201710187945A CN 107167422 B CN107167422 B CN 107167422B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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Abstract
The invention belongs to the technical field of metallurgical detection, and discloses a method for detecting the adhesion of a zinc layer of an automobile sheet, which comprises the following steps: preparing a galvanized steel sheet sample of an automobile sheet; coating viscose on the sample; baking the sample after the glue coating is finished, and then naturally cooling; bending the baked sample by 90 +/-5 degrees; the adhesive surface faces outwards; and comparing the standard evaluation spectra, and observing and evaluating the falling condition of the zinc coating at the viscose fracture position on the bending state sample to obtain an evaluation result. The invention provides a high-reliability and excellent-evaluation-capability method for detecting the adhesion of a zinc layer of an automobile sheet.
Description
Technical Field
The invention relates to the technical field of metallurgy detection, in particular to a method for detecting the adhesion of a zinc layer of an automobile sheet.
Background
In order to improve the corrosion resistance of the automobile body, galvanized steel sheets are widely applied in the automobile industry, and a galvanized layer has good corrosion resistance.
If the steel plate and the coating are not firmly combined, the zinc layer falls off, and the exposed steel plate loses the protection of the coating, namely the use value of the galvanized plate is lost. Therefore, the coating adhesion is a key problem influencing the quality of galvanized products and is also a direct cause of cracks and falling of the zinc layer. The conventional zinc layer adhesion test is mainly to bend a galvanized product at a specified angle and then paste the bent outer surface by using an adhesive tape, so that the zinc layer is qualified without falling off.
However, for high-end automobile plates such as BMW, the method has poor matching degree with the application process of the high-end automobile plates, cannot better simulate the application process of the automobile plates, and has insufficient evaluation capability.
Disclosure of Invention
The invention provides a method for detecting the adhesiveness of a zinc layer of an automobile sheet, which solves the technical problem of insufficient evaluation capability of the zinc layer in the prior art.
In order to solve the technical problem, the invention provides a method for detecting the adhesion of a zinc layer of an automobile plate, which comprises the following steps:
preparing a galvanized steel sheet sample of an automobile sheet;
coating viscose on the sample;
baking the sample after the glue coating is finished, and then naturally cooling;
bending the baked sample by 90 +/-5 degrees; the adhesive surface faces outwards;
and comparing the standard evaluation spectra, and observing and evaluating the falling condition of the zinc coating at the viscose fracture position on the bending state sample to obtain an evaluation result.
Further, the preparing of the test piece of the automobile sheet galvanized steel sheet includes:
transversely cutting 6 long strip-shaped samples at any position of a galvanized steel plate blank sample;
and if and only if the 6 long strip-shaped samples are qualified, the evaluation result is finally qualified.
Further, the dimensions of the elongated sample are: the size is 200 plus or minus 2mm multiplied by 30 plus or minus 2 mm.
Further, the coating of the adhesive on the sample includes:
coating the special adhesive for the automobile plate on the sample by using a gluing tool;
the glue extruding speed of the glue coating tool is matched with the moving speed of the glue coating tool, and uniform coating is kept.
Further, the size of the strip applied to the test piece was 10mm in width, 100mm in length and 5mm in thickness.
Further, the gluing tool is a rotary mud extruder.
Further, the baking the sample coated with the adhesive comprises:
the gummed sample is baked for 25 minutes in a temperature environment ranging from room temperature to 175 ℃.
Further, the temperature of the temperature environment is 175 ℃.
Further, the bending the baked sample by 90 ± 5 ° includes:
selecting the diameter of the bending core according to the thickness of the sample to bend for 90 +/-5 degrees;
wherein, the selection range of the bending core diameter is as follows:
when the thickness of the sample is less than or equal to 1mm, the diameter of the bent core is 1.6 mm;
when the thickness of the sample is more than 1mm and less than or equal to 1.5mm, the diameter of the bent core is 2.2 mm;
when the thickness of the sample is more than 1.5mm and less than or equal to 2.0mm, the diameter of the bent core is 3.2 mm;
when the thickness of the sample is more than 2.0mm and less than or equal to 3.0mm, the diameter of the bending core is 4.8 mm.
Further, the detection method further comprises: cleaning a sample;
the sample washing step comprises: after the sample is prepared and before the viscose is coated, oil stains on the surface of the sample are cleaned by adopting alcohol.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
according to the method for detecting the adhesion of the zinc layer of the automobile plate, the application process of the high-end automobile outer plate is fully simulated through equipment, tools, materials and operation; specifically, the automobile outer panel setting test operation is processed by simulating the use state of the automobile outer panel, the consistency of the application process of the automobile outer panel and the laboratory simulation conditions is fully considered, the evaluation capability of the adhesion of the zinc layer of the automobile outer panel is improved, the evaluation of the adhesion of the zinc layer of the automobile outer panel is more objective and accurate, and the test result is higher in persuasion of the automobile industry.
Drawings
FIG. 1 is a flow chart of a method for detecting adhesion of a zinc layer of an automobile panel according to an embodiment of the present invention;
FIG. 2 is a standard evaluation profile provided in an embodiment of the present invention.
Detailed Description
The embodiment of the application provides a method for detecting the adhesiveness of a zinc layer of an automobile sheet, and solves the technical problem that the evaluation capability of the zinc layer is insufficient in the prior art; the technical effects of improving the evaluation capability and reliability are achieved.
In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the drawings and the specific embodiments of the specification, and it should be understood that the embodiments and specific features of the embodiments of the present invention are detailed descriptions of the technical solutions of the present application, and are not limitations of the technical solutions of the present application, and the technical features of the embodiments and examples of the present application may be combined with each other without conflict.
Referring to fig. 1 and 2, a method for detecting adhesion of a zinc layer on an automobile panel comprises the following steps:
preparing a galvanized steel sheet sample of an automobile sheet; transversely cutting 6 long strip-shaped samples at any position of a galvanized steel plate blank sample; and if and only if the 6 long strip-shaped samples are qualified, the evaluation result is finally qualified. The dimensions of the strip-shaped sample are as follows: the size is 200 plus or minus 2mm multiplied by 30 plus or minus 2 mm.
Coating viscose on the sample; coating the special adhesive for the automobile plate on the sample by using a gluing tool; the glue extruding speed of the glue coating tool is matched with the moving speed of the glue coating tool, and uniform coating is kept. The dimensions of the strip coated on the test specimen were 10mm in width, 100mm in length and 5mm in thickness. The gluing tool is a rotary mud extruder.
Baking the sample after the glue coating is finished, and then naturally cooling; the gummed sample is baked for 25 minutes in a temperature environment ranging from room temperature to 175 ℃. The temperature of the temperature environment was 175 ℃.
Bending the baked sample by 90 +/-5 degrees; the adhesive surface faces outwards; selecting the diameter of the bending core according to the thickness of the sample to bend for 90 +/-5 degrees; wherein, the selection range of the bending core diameter is as follows:
when the thickness of the sample is less than or equal to 1mm, the diameter of the bent core is 1.6 mm;
when the thickness of the sample is more than 1mm and less than or equal to 1.5mm, the diameter of the bent core is 2.2 mm;
when the thickness of the sample is more than 1.5mm and less than or equal to 2.0mm, the diameter of the bent core is 3.2 mm;
when the thickness of the sample is more than 2.0mm and less than or equal to 3.0mm, the diameter of the bending core is 4.8 mm.
And comparing the standard evaluation spectra, and observing and evaluating the falling condition of the zinc coating at the viscose fracture position on the bending state sample to obtain an evaluation result.
The detection method further comprises the following steps: cleaning a sample;
the sample washing step comprises: after the sample is prepared and before the viscose is coated, oil stains on the surface of the sample are cleaned by adopting alcohol.
The present solution is illustrated below by a specific detection scheme.
A technical scheme for measuring the adhesion of a zinc layer of an automobile plate comprises the following steps:
preparing a tool material;
a barrel of automobile-specific viscose (Betamate1496V or Betamate 1480);
rotating a mud extruder, and opening a semicircular die to 10mm wide and 5mm high;
a cold-rolled sheet shearer;
the cold bending tester comprises four bending cores with the diameters of 1.6mm, 2.2mm, 3.2mm and 4.8 mm;
a high-precision oven with the temperature ranging from room temperature to 300 ℃ and the uniformity of +/-2 ℃;
dust-free cloth for cleaning the viscose and the oil stain on the steel plate;
alcohol;
an angle ruler for verifying the bending angle;
scrap steel pieces.
The embodiment specifically comprises the following steps:
transversely cutting 6 samples at any position of a galvanized steel plate blank sample by using a plate shearing machine, wherein the size of the samples is 200 +/-2 mm multiplied by 30 +/-2 mm, and the surface of the samples is not mechanically scratched;
placing the sample in parallel on a test bed, and cleaning oil stains on a test surface of the sample by using alcohol;
taking out the rotary mud extruder, wetting the rubber ring in alcohol by holding the propeller with a hand, inserting the rubber ring into the special adhesive for the automobile after volatilization to absorb the adhesive, cleaning the adhesive on the surface of the tool, and covering the upper cover of the mud extruder for mounting the mold;
coating semicircular viscose glue on the surface of a sample at a constant speed, matching the glue extruding speed with the moving speed to ensure that the width of the adhesive tape is 10mm, the height of the adhesive tape is 5mm and the length of the adhesive tape is about 100mm, and dipping waste steel sheets with alcohol to cut off the adhesive tape and coat the next sample;
after the sample is coated with the glue, placing the sample in a baking oven heated to 175 ℃, baking for 25 minutes, and naturally cooling;
extruding residual viscose glue out of the mud extruder, cleaning each part of the tool with alcohol, and covering a viscose glue barrel cover for later use;
selecting a bending core with a proper size according to the thickness of a sample and the following table to bend by 90 +/-5 degrees, enabling the adhesive surface to be outward, confirming by using an angle ruler after bending, and evaluating after the angle meets the requirement;
| thickness of the sample | Diameter of curved core |
| ≤1mm | 1.6mm |
| ＞1mm-≤1，5mm | 2.2mm |
| >1，5mm-≤2，0mm | 3.2mm |
| ＞2，0mm-≤3，0mm | 4.8mm |
Referring to fig. 2, the standard evaluation spectrum shows that the final result is qualified when all 6 samples are qualified.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
according to the method for detecting the adhesion of the zinc layer of the automobile plate, the application process of the high-end automobile outer plate is fully simulated through equipment, tools, materials and operation; specifically, the automobile outer panel setting test operation is processed by simulating the use state of the automobile outer panel, the consistency of the application process of the automobile outer panel and the laboratory simulation conditions is fully considered, the evaluation capability of the adhesion of the zinc layer of the automobile outer panel is improved, the evaluation of the adhesion of the zinc layer of the automobile outer panel is more objective and accurate, and the test result is higher in persuasion of the automobile industry.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (8)
1. An adhesion detection method for a zinc layer of an automobile sheet is characterized by comprising the following steps:
preparing a galvanized steel sheet sample of an automobile sheet;
coating viscose on the sample;
baking the sample after the glue coating is finished, and then naturally cooling;
selecting the diameter of the bent core according to the thickness of the sample to bend at 90 +/-5 degrees, and enabling the adhesive surface to face outwards;
comparing the standard evaluation spectra, and observing and evaluating the falling condition of the zinc coating at the viscose fracture position on the bending state sample to obtain an evaluation result;
wherein, the selection range of the bending core diameter is as follows:
when the thickness of the sample is less than or equal to 1mm, the diameter of the bent core is 1.6 mm;
when the thickness of the sample is more than 1mm and less than or equal to 1.5mm, the diameter of the bent core is 2.2 mm;
when the thickness of the sample is more than 1.5mm and less than or equal to 2.0mm, the diameter of the bent core is 3.2 mm;
when the thickness of the sample is more than 2.0mm and less than or equal to 3.0mm, the diameter of the bending core is 4.8 mm.
2. The method for inspecting adhesion of zinc layer of automotive sheet according to claim 1, wherein said preparing a specimen of said automotive sheet galvanized steel sheet comprises:
transversely cutting 6 long strip-shaped samples at any position of a galvanized steel plate blank sample;
and if and only if the 6 long strip-shaped samples are qualified, the evaluation result is finally qualified.
3. The method for inspecting adhesion of zinc layer of automobile sheet according to claim 2, wherein: the dimensions of the strip-shaped sample are as follows: the size is 200 plus or minus 2mm multiplied by 30 plus or minus 2 mm.
4. The method for inspecting adhesion of zinc sheet of automobile according to claim 1, wherein said applying adhesive on said test specimen comprises:
coating the special adhesive for the automobile plate on the sample by using a gluing tool;
the glue extruding speed of the glue coating tool is matched with the moving speed of the glue coating tool, and uniform coating is kept.
5. The method for inspecting adhesion of zinc layer of automobile sheet according to claim 4, wherein: the dimensions of the strip coated on the test specimen were 10mm in width, 100mm in length and 5mm in thickness.
6. The method for inspecting adhesion of zinc layer of automobile sheet according to claim 5, wherein: the gluing tool is a rotary mud extruder.
7. The method for testing the adhesion of an automotive sheet zinc layer according to claim 1, wherein the baking of the painted test piece comprises:
the gummed specimens were baked at 175 ℃ for 25 minutes.
8. The method for inspecting adhesion of zinc layer on automobile sheet according to any of claims 1 to 7, further comprising: cleaning a sample;
the sample washing step comprises: after the sample is prepared and before the viscose is coated, oil stains on the surface of the sample are cleaned by adopting alcohol.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710187945.2A CN107167422B (en) | 2017-03-27 | 2017-03-27 | Method for detecting adhesion of zinc layer of automobile sheet |
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| CN201710187945.2A CN107167422B (en) | 2017-03-27 | 2017-03-27 | Method for detecting adhesion of zinc layer of automobile sheet |
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| JP2008070251A (en) * | 2006-09-14 | 2008-03-27 | Hitachi Maxell Ltd | Peeling strength measuring method and peeling strength measuring device used therefor |
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| CN203658117U (en) * | 2013-11-13 | 2014-06-18 | 浙江吉利控股集团有限公司 | Making tool of test board for detecting performance of sealing material of automobile |
| CN103674834A (en) * | 2013-12-04 | 2014-03-26 | 武汉钢铁(集团)公司 | Rapid detection method for surface oxide scale adhesion of hot rolling strip steel |
| CN103983569A (en) * | 2014-05-14 | 2014-08-13 | 首钢总公司 | Coating stripping detection method of coating plate |
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