Overview of powder coating pretreatment

in order to obtain excellent coating film and excellent product quality, before coating the preparation of the surface of the coating is called coating surface treatment, referred to as pretreatmentPre-treatment work mainly includes the following three aspects:(1) from the surface of the coated to remove a variety of dirt, such as degrease (also known as degreasing), rust removal to ensure the physical and chemical performance of the coating film and product qualityCommon dirt are: metal corrosion products (such as rust, oxidizing skin), solder slag, dust, alkali stains, oil, old coating film and so onIf these dirt is not removed before coating, it will not only affect the adhesion of the coating film, corrosion resistance, moisture resistance, product appearance, and rust will continue to spread inside the coating film, in severe cases, the coating film will fall off(2) chemically treatthechemically on the surface of the washed workpiece to improve the corrosion resistance of the coating film and the adhesion of the coating film to the surface of the workpieceSuch as the phosphate treatment of steel parts, aluminum parts for oxidation treatment(3) using mechanical methods to eliminate the mechanical processing defects of the workpiece, adjust the roughness of the surface of the workpiece, in order to improve the appearance of the product quality and adhesionSuch as flat workpiece surface bumps and burrs, with spray sand method to increase the roughness of the surface