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Study on application of ED7000 electrophoretic paint with high throwing power
Pages: 433-436
Year: Issue:  10
Journal: Electroplating & Finishing

Keyword:  automobile coatingelectrophoretic paintthrowing powerthin filmmatchability;
Abstract: ED7000 electrophoretic paint is a high-throwing-power and thin-film product developed by an international automobile coating supplier to meet the requirement of high throwing power for coating the car bodies in white and decrease the consumption of coating materials and energy. In the paper, the ED7000 emulsion and the pigment paste were mixed with a mass ratio of 8 to 1 in a small electrophoretic tank, followed by adding water to adjust solid content of the bath to about 23% and curing at (32±2) °C for 48 h. Some attestation tests were carried out, and the bath parameters and coating properties were examined. Whether the electrophoretic paint can be matched with the 3-coat-3-bake or midcoat-free process as well as the PVC, polyurethane glass adhesive, and water glass were studied. The trial production was carried out on a real production line. It was found that the ED7000 paint has advantages of high throwing power, low film thickness (less than 15μm with a phosphating layer, saving 12%of coating material), wide ranges of construction conditions, and easy bath management. The disadvantages of the paint are high electrophoretic voltage (20 V higher than that of a conventional process), worse roughness (Ra=0.30-0.35μm), and difficulty in coating the top. The paint is suitable to be applied to A- and B-class cars with smaller areas to be coated by electrophoresis.
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