Chemical pre-treatment: dip pre-treatment, spray pre-treatment
Wastewater is generated by dip and spray pretreatment, which needs to be treated with environmentally friendly chemicals and wastewater treatment devices.
Physical Pretreatment: Sandblast Pretreatment, Shot blasting Pretreatment
No waste water is generated, so there is no need to worry about environmental issues.
Ours Coating will design your pretreatment according to the actual needs of your coating line and workpiece. The advantages are high degree of automation, saving workers, thorough cleaning and ensuring stable product quality.
Pretreatment classification:
Chemical pretreatment | Physical pretreatment |
Spray pretreatment | Dip pretreatment | Sand blasting | Shot blasting |
Workpieces: Single species Simple structure Large production | Workpieces: More varieties Larger sizes Complex shapes Smaller production | Thin workpieces | Thick workpieces |
Will produce wastewater | No wastewater |
Common chemical pretreatment:
Pre-treatment equipment according to the shape of the workpiece and different production volume, the main structural form of impregnation type, tunnel through the spray type; impregnation type is suitable for large parts, stupid parts, such as the production of not too large production line; the tunnel through the spray type is suitable for small workpieces and the production of large production lines.
Related equipment: pre-treatment tanks (stainless steel or concrete tanks, the number is equal to the number of pre-treatment processes), spraying lines.
Related materials (chemicals): sulfuric acid, hydrochloric acid, soda ash (Na2CO3) acidic degreasing agent, passivation solution.
Purpose: Remove oil, dust, rust on the surface of the workpiece, and generate a layer of corrosion resistance on the surface of the workpiece and can increase the adhesion of the spray coating "phosphate layer".
Main process steps: degreasing, de-rusting, water rinse, passivation. Workpiece after pretreatment will have no oil, rust, dust, and the original silver-white glossy surface to generate a layer of uniform and rough not easy to rust gray phosphate film, not only to prevent rust but also increase the adhesion of the spray coating.
Wastewater solution: Use environmentally friendly potion and wastewater treatment device to meet the standard discharge after treatment.
Common physical pretreatment:
Generally there are two kinds of sand blasting and shot blasting, there is no wastewater generated, no need to worry about environmental issues.
Sandblasting is generally suitable for thinner workpieces, shot blasting is generally suitable for thicker workpieces.
Contact OURS COATING to design a pretreatment line, we are your right choice!
