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Paint coating adhesion test method

by:GESTER Instruments     2021-05-27
Paint coating adhesion is an important indicator for judging the quality of paint coatings. This article focuses on the determination of paint coating adhesion and the test operation process. For more information, please consult the Standards Group. Paint coating adhesion test method: Paint adhesion refers to the ability of the paint film and the surface of the object to be coated or between the coatings to bond with each other. Adhesion is an important technical index and a prerequisite for the paint film to have a series of properties. The commonly used method for testing is to mark a 15X15 mm grid with a paper knife within a range of 50X100 mm on the painted surface, and then stick the tape on the painted surface with the grid. Use a 500G stick or fingers to press it tightly, and then hold one end of the tape and pull the tape apart in a rapid and sudden manner in a direction perpendicular to the coating surface to check whether the coating is stuck and peeled off by the tape. No peeling is considered qualified. If peeling occurs between the coatings, it is considered qualified. If peeling occurs between the metal and the coating, it is considered unqualified. The factory's professional test is to use 100-grid test. The tool is a 100-grid knife. The width of the knife edge is about 10mm~12mm. There are 10 grids every 1mm~1.2mm. When a straight line is drawn, there will be 10 linear knife marks with the same interval. , Draw it at the vertical position of the straight line knife mark, it becomes a 10*10 square with 100 squares. After the 100-grid knife is finished, you must also use tape to test whether it will fall off. First, stick the tape on the 100-grid position, press down with your fingers to stick the tape tightly, and then tear the tape up with an instant force, and visually observe the material. Does the paint on the paint come off? In addition, the tape is not just any kind of tape. According to the JIS standard, the brand and model must be specified. Precautions for paint adhesion test: 1. The cut should penetrate the coating, but the cut should not be too deep into the substrate. If the coating is too thick and hard to penetrate the substrate, the test is invalid. 2. The tape is generally a 25mm wide translucent tape, and the backing material is polyester film or acetate fiber. Stick the tape on the entire grid, and then tear it off at a small angle. The result can be obtained according to the ratio of the glued area on the surface of the paint film. 3. The test should be carried out at a temperature of 23±2℃ and a relative humidity of 50±5%. Standards for paint adhesion test: There are five levels in total, and the adhesion is qualified when the adhesion is ≥4B. 5B-The edge of the scribe line is smooth, and there is no paint peeling off at the edge and the intersection of the scribe line; 4B-There is a small piece of paint peeling off at the intersection of the scribe line, and the total area of u200bu200bthe peeling is less than 5%; 3B-in the scribe line There are small pieces of paint peeling off at the edges and intersections, and the total peeling area is between 5% and 15%; 2B-There are pieces of paint peeling off at the edges and intersections of the scribe line, and the total peeling area is 15%~ Between 35%; 1B-there are pieces of paint peeling off at the edges and intersections of the scribe lines, and the total area of u200bu200bthe peeling is between 35% and 65%; 0B-there are pieces of paint at the edges and intersections of the scribe lines The paint peeled off, and the total area of u200bu200bpeeling off is greater than 65%. Paint coating adhesion test is important. It is an important standard and basis for dividing paint and coating grades and judging quality. It is also an important indicator for judging whether a paint and coating product is a product. The paint adhesion will directly affect the decoration effect. We must carefully read the adhesion test level on the label of the paint and coating product when purchasing.
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