How to deal with galvanized sheet surface when painting

If the galvanized sheet is rust free, polish it with fine sandpaper first to increase the adhesion of the paint. The primer can be regular paint or spray paint. The principle should be the same or similar to the color to be sprayed. Then sand and paint.

Galvanized sheet is a steel plate with a layer of zinc on the surface. Galvanizing is a cost-effective preservative, and about half of the world's zinc production is used in the process. Galvanized steel plate is to prevent the surface corrosion of steel plate and prolong its service life. The surface of the steel plate is coated with a layer of metal zinc, called galvanized plate.

Corrosion of passenger cars is generally analyzed according to three categories: first, appearance corrosion, mainly caused by rust on the appearance of the surface, the definition of appearance parts is generally 3 years without rust; The second is internal corrosion, the surface of the pores or cavity of the product parts is corroded, the occurrence of serious corrosion perforation, generally defined as 10 years without perforation; Third, structural corrosion will lead to functional failure and safety problems. Depending on the severity of the above three types of corrosion, galvanized steel is required.

Galvanized sheet is mainly used in the main corrosion area of the car body. Large thin-walled parts such as side outer plate, top cover, outside plate and inner wheel cover, as well as areas that are not easy to electrophoresis. Galvanized sheet is about 1500 yuan more expensive than non-galvanized sheet per ton. Joint-venture vehicles account for a large proportion of domestic car applications are relatively few. And the position of the connection points where the chassis and underbody are often removed.

Influence of galvanized sheet on body structure design.

The anticorrosive ability of galvanized sheet itself and the electrophoretic gap in the cavity can be reduced appropriately. For the gap between the side wall strengthening plate and the outer plate, the gap of the non-galvanized plate should be greater than 10mm, and the gap of the galvanized plate only needs to be greater than 5mm.

Galvanized sheet climbing grid has the advantages of high temperature resistance, corrosion resistance and long service life. , electrostatic spraying on the surface to ensure that the product can be used for a long time. Can realize tool-based installation and disassembly; There is no need for steel pipe fasteners, which not only saves the rent of materials, but also simplifies the on-site management of equipment materials.