Is the basic coating process applied to the body sheet metal parts? (I)

In fact, the basic coating process is widely used in the whole process of body sheet metal repair. According to my experience in automotive sheet metal repair for many years, the specific application of basic painting process in maintenance and replacement of body sheet metal can be summarized as follows:

Basic coating of black metal sheet

The black metal plate is easy due to exposure to air or contaminated with harmful substances and other factors, gradually led to the emergence of yellow rust and oxidation corrosion, damage to the original coating layer. Especially in the process of sheet metal operation, after hammering, welding and other processes, it is more likely to damage the original coating protection layer and accelerate corrosion. Even if the paint film is sprayed, the paint film will soon fall off with the base coating. At this point, a complete coating process must be carried out again. With a wire brush or sand paper on the surface of sheet metal for cleaning polished black. It is possible to use the nylon grinding disc, which is now widely used, to clean the metal surface thoroughly. The body for disintegration repair (especially car accident), should be in the sheet metal folding, joint spraying for removing rust and paint spraying liquid, remove the metal oxide before and after welding slag and dirt, or with good anti rust capability instead of anti rust primer.

Base coating for the bonding surface of sheet metal parts

If the car body is repaired, if it does not rust treatment, it will be oxidized and corroded by the presence of various impurities and water vapor within one or two years, and the strength of the welding point will be affected. Therefore, the zinc flux should be sprayed in time.

The zinc coating (zinc rich coating) is a new material used to prevent oxidation and corrosion of the joint surface of sheet metal parts. There are two forms of spray and coating. It has good conductivity, high temperature resistance and electrochemical cathodic protection. It can form a rust protection layer between the welding joints of sheet metal parts, improve the corrosion resistance of the parts around the solder joints, protect the solder joints, and ensure that the body strength after repair is not inferior to that of the original body.

Three. Basic coating for plastic welding

Although the surface of weld, solder joint and repaired steel plate is polished and cleaned, there are countless tiny and irregular bump which is invisible to the naked eye, which contains numerous oxides, impurities, water vapor and so on. Although the ordinary putty or antirust paint has the function of antirust, it can only prevent the invasion of the appearance of rust and play a temporary sealing effect. As long as it is affected by humid and other harsh environments, defects will soon emerge. If the epoxy primer is used, it can play an effective protective role.

Epoxy primer is a good rust inhibitor when applied to the seam or lap joint surface after welding, grinding, heating, quenching and shrinking. In general is to repair the pieces of film (i.e. the feather edge film groove), after cleaning the surface coated with epoxy primer, can ensure that after processing after the panel does not rust in a very long time, even if the original rust, will prevent the expansion of the scope of rust.