Adhesion performance test of passivating film for galvanized sheet

The circle adhesion test is carried out with reference to GB1720.79 (89) "Determination of Paint Film Adhesion". The experimental paint is 1alspar epoxy paint produced by Qianli Industrial (Shanghai) Coatings Co., Ltd. Chengshibo Subsidiary Company, using RDS line The paint film is prepared by the method of roller coating with a rod applicator, and a circular rolling line is drawn on the surface of each good paint film with an adhesion Tester. The upper side of the upper scratch is the target of the inspection, and the test results are divided into seven grades. The best adhesion is the first grade; the worst adhesion is the seventh grade.

The cross-cut force test is carried out with reference to GBIT9286-1998 "Colored paint and clear knee-coating film cross-cut test". The experimental coating is valspar epoxy paint produced by Lili Industrial (Shanghai) Coatings Co., Ltd. Chengshibo Subsidiary Company. Each paint film is prepared by the method of roller coating with an RDS wire rod Film Applicator. Use a single-edged cutter to cut 100 vertical spots on the surface of the paint film at three different positions on the surface of the tested sample that has been painted. For the intersecting 1mm×1mm grid, stick the surface of the grid with an adhesive tape, and quickly open the adhesive tape along the direction of the scratch at an angle of about 60° to the contact surface, and observe the paint where the scratch intersects. Membrane peeling and grading.