Electrophoretic coating process is a special coating film formation method, divided into anodic electrophoretic coating (AED) and cathodic electrophoretic coating (CED). It is only suitable for the special water-soluble or water emulsion paint for electrophoretic coating which is different from the general paint, referred to as electrophoretic paint.
The electrophoretic coating process is to immerse the conductive substrate in an electrophoresis bath filled with water with a relatively low concentration as the anode (or cathode), and set a corresponding cathode (or anode) in the bath. A coating method in which a direct current is applied between the two poles, and a uniform, water-insoluble coating film is precipitated or deposited on the coated object after a certain period of time.
According to the polarity of the object to be coated and the types of electrophoretic coating, the electrophoretic coating process can be divided into two types: anode electrophoretic coating method, the object to be coated is the anode, and the anionic (negatively charged) electrophoretic painting is used; cathodic electrophoretic coating method, the object to be coated is the cathode, and the cationic (positively charged) electrophoretic coating is used.
Electrophoretic coating is a coating method that relies on the action of an electric field to make the coating ion electrophoresis onto the object to be coated by discharge and deposition to form a film. The equipment is generally composed of an electrophoresis tank, an electrophoretic paint transfer tank, a circulating stirring filtration system, a paint replenishing system, an ultrafiltration system, a temperature control heat exchange system, an anode (cathode) circulation system, a power supply device and a closed ultrafiltration cleaning system. The equipment has the advantages of high production efficiency, uniform film thickness, good paint film adhesion, strong corrosion resistance and easy painting of the internal cavity structure.
Electrophoretic coating process is a special coating film forming method developed in the past 30 years, and it is the most practical construction process for water-based coatings. It has the characteristics of water-soluble, non-toxic, easy to automate control, etc., and it has quickly been widely used in automobiles, building materials, hardware, home appliances and other industries.