The so-called powder electrostatic spraying uses the object to be coated as the anode, which is generally grounded; the powder coating atomization structure is the cathode. Connect the power supply with negative high voltage. In this way, a high-voltage electrostatic field is formed at the two poles. Due to corona discharge at the cathode. The sprayed paint particle medium can be charged and further atomized. According to the principle of repulsion of same sex and attraction of opposite sex. The charged particulate coating medium is subjected to electric field forces. It flows directionally along the power line to the surface of the positively charged object, and deposits into a uniform and firmly attached film.
Electrostatic spraying can also use positive corona discharge, but the critical voltage of negative corona discharge is lower than that of positive corona discharge, it is more stable, safe and not easy to generate sparks. Therefore, under normal circumstances, the coated object is grounded as the positive electrode.
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