3824. Surface Treatment Of Body
The consideration of the body surface treatment is very strict, careful and considerate. Although it is not
high-grade car, it is nearly the same with the high-grade car on the surface treatment.
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1 Application of Galvanized Steel Plate
In order to prevent the steel plates from rusting, all outside punching parts are made by galvanized steel
plate.
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2Phosphatization
Phosphatization is also called pre-treatment of painting. After degreasing cleaning to the body, a layer of
zinc phosphate is applied on the body. The layer thickness is controlled less than 3µm, which can take
effect as the first protecting layer and also is favorable to adhesion of the coating used in the next step.
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3Cathode Electrophoresis
Electrophoretic painting shows its high efficiency and quality, safety, economy, etc. in actual application.
Four kinds of electrochemical phenomena (dielectric, electrophoresis, Electrodeposition, electroosmosis)
appear in the course. The feature and the advantage of cathode electrophoresis is multiply better than
anode electrophoresis. None is better than it and the technique management is also extremely strict.
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4Intermediate Coating
The intermediate coating is one located between the base coating (primer) and the surface coating. The
function is mainly to improve the flatness of the workpiece surface and the base coating and to create a
good base for top paint. The brilliance and fullness of the painting layer and the decorating effect of the
coating will be greatly improved.
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5Final Coating
The final coating on a vehicle is the last coating in multilayer coatings. It will directly influence the
decorating effect, weather resistance and the appearance of the vehicle. Choosing final coating is very
strict. Match, economy and operational easiness should be considered. The performance of all items can
reach the national and company standard. The appearance of the paint film is flat, smooth, plump, etc.
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6Protecting coating for storage
When left in an open air for a long term (more than 3 months) or transferred by sea, a layer of water
soluble protecting wax should be applied on the surface of the body .Ultraviolet absorbing material is
added in the protecting coating. Clean it with detergent or fresh water before selling to make the brightness
of the painting reappear.
