Several surface treatment processes prior to automotive paint coating

China Coatings Online News Information: In order to obtain high-quality coating, the car paint before the surface of the coating to be pre-treatment work, are called car paint front surface treatment. Automotive paint front surface treatment is the basis of the coating process, it has a great impact on the quality of the entire coating, including surface cleaning (oil removal, rust removal, dust protection, etc.) and phosphation treatment two parts.surface cleaning has the following methods:
1, cleaning with thermolytic fluid and scrubbing with organic solvents to remove oil pollution, first with 320 to 400 pieces of sandpaper on the surface of the glass and steel, and then with organic solvent cleaning to remove the release agent, the body surface of yellow rust with phosphoric acid preparation cleaning liquid scrubbing, to ensure that the coating has excellent corrosion resistance, as well as coating and coating surface has good adhesion.2, a variety of chemical treatment of the surface of the cleaned coated metal parts to improve the adhesion and corrosion resistance of the paint film. Special chemical treatment of steel plate parts is carried out to improve the binding force of paint film and substrate.
3, the use of mechanical methods to remove the mechanical processing defects of the coating and the creation of coating film required roughness. The phosphate treatment method has the whole injection and the whole immersion type. Rapid phosphation treatment with thin-film zinc salts, phosphate film mass 1 to 3g/m2, film thickness 1 to 2 m, crystallization particle size 1 to 10 m, can be used at low temperature 25 to 35 degrees C or medium temperature 50 to 70 degrees C for phosphation.