Electrostatic spraying is a coating method that uses the action of a high-voltage electric field to charge the paint mist and adsorb it on the workpiece with the opposite sex under the action of the electric field force. Specifically, a negative high voltage is first applied to a metal spray cup with a sharp edge or tip, and the workpiece is grounded, so that a high-voltage electrostatic field is formed between the negative electrode and the workpiece. By corona discharge, a large number of electrons are first excited near the negative electrode, and the paint is atomized with a rotating cup or compressed air and sent into the electric field. The paint particles obtain electrons and become negatively charged particles, which move rapidly under the action of the electric field force, and finally Evenly attached to the surface of the workpiece:
Its characteristics are:
1) The coating film is more uniform than manual spraying, with good adhesion and strong wear resistance.
2) Continuous spraying and automatic production can be realized, with high work efficiency and good working conditions.
3) There is less paint mist scattering, and the paint utilization rate is high.
4) Due to the electrostatic shielding effect, it is not suitable to use electrostatic spraying for equipment workpieces with complex structures and gaps less than 3cm that cannot be painted, or that are bulky, complex in structure, and difficult to accommodate the electrostatic field.