Characteristics of electrophoretic powder coating and cathodic electrophoretic coating

Excerpted from: questions and answers on practical technology of powder coating and coating: nanrenzhi electrophoretic coating is a special kind of powder coating, which can also be regarded as a special kind of electrophoretic powder coating For example, the pigments and fillers of electrophoretic coatings are special varieties replaced by powder coatings From this point of view, the electrophoretic powder coating and the cathodic electrophoretic coating can not be separated from the "electrophoretic" characteristics, there are quite a lot of common; but the composition of the electrophoretic powder coating is complex, and the particle size of the dispersed particles is large, which is different from the cathodic electrophoretic coating The general characteristics of electrophoretic powder coating and cathodic electrophoretic coating are shown in the table Table 2-25 comparison of general characteristics of electrophoretic powder coating and cathodic electrophoretic coating: coating type: electrophoretic powder coating; solid content of cathodic electrophoretic coating /% 13-18 15-20 coating liquid temperature / ℃ 25-28 25-28 coating voltage / V 200-500 15-300 electrodeposition time / s 16-60 100-180 film thickness (200V voltage) / μ m 30-50 (20s) 19-21 (180s) pH (25 ℃) 5.2-5.8 5.8-6.5 coulomb efficiency / (mg / C) 40-60 20-30 penetration (Ford method) / M 3-5 22-26 baking conditions / (℃ / min) preheating 80 / 10 (175-190) / (20-30) (175-190) / (20-30) Compared with the cathodic electrophoretic coating, the electrophoretic powder coating and the cathodic electrophoretic coating are both water-based The solid content, liquid temperature and pH value of the bath solution of the coating have little difference The main difference is that the electrophoretic powder coating has shorter electrodeposition time, thick film thickness and high coulomb efficiency than the cathodic electrophoretic coating The disadvantage is that the electrophoretic powder coating has small penetration rate and needs preheating to remove water before baking and curing.