In fact, the basic coating process has been widely applied to the body sheet metal repair, the whole process. According to the author for many years of automotive experience in sheet metal repairs, basic painting process in car body sheet metal repair and replacement of the specific application, can be summarized into the following categories:
1, sheet metal parts with surface-based coating
After the repair the car body, if you do not carry out anti-rust treatment, often a year or two sheet metal parts with surface cracks would be due to a variety of impurities, the presence of water vapor oxidation of corrosion, affecting the strength of welding points, it should be timely spraying Welding of zinc agent.
Welding zinc (zinc-rich coating) is a dedicated sheet metal parts with surface oxidation corrosion of the new materials, there are two kinds of spray and coating formulations. It is good conductivity, high temperature, there are electrochemical cathodic protection role, be able to weld sheet metal with surface rust layer formed between the protective layer to improve corrosion of solder joints around the area will not be the ability to protect the solder joints to ensure that body strength after the repair is not inferior to the original body.
Second, the basis of ferrous metal sheet coating
Ferrous metal plate can easily be exposed to air or contaminated with hazardous substances and other factors, the gradual oxidation corrosion and cause a yellow stain, damage to the original paint layer. Particularly in the sheet metal work through the process of hammering, welding and other craft after processing the site, are more likely to make the original coating protective layer is damaged, accelerated corrosion, even if the coating film, the film will soon find out with off with the base coat. At this point, we must conduct a thorough re-coating treatment.
Wire brush or sandpaper on the black iron sheet metal for polishing the surface clean. Conditional use has now been widely used for cleaning tools - nylon grind plate on the polished metal surface to make a thorough cleaning. To the disintegration of the body to repair time (in particular, car accident), should be the hem sheet metal, painting designed to rust lap Department, in addition to paint, remove the metal welding slag and dirt before and after the oxidation of solvent spraying liquid, or the ability to use a good anti-rust anti-rust primer instead.
In recent years, China's vehicle maintenance enterprises in the car repair and shaping sheet metal during the use of technology, processes, materials and equipment than in the past has been greatly improved, but are still in the basic technological aspects of painting appears to lag somewhat behind. Especially in the rust-proof measures are not many ways, and many rely solely on anti-rust paint brushing. This often resulted in the weld and repair joint surface and other parts of premature corrosion, thereby reducing the car body of local life, may even affect the vehicle's safety. In recent years, China's vehicle maintenance enterprises in the car repair and shaping sheet metal during the use of technology, processes, materials and equipment than in the past has been greatly improved, but are still in the basic technological aspects of painting appears to lag somewhat behind. Especially in the rust-proof measures are not many ways, and many rely solely on anti-rust paint brushing. This often resulted in the weld and repair joint surface and other parts of premature corrosion, thereby reducing the car body of local life, may even affect the vehicle's safety.
