The cavity injection wax is to inject a certain amount of liquid wax into the four cavities at the bottom of the vehicle body. After a specific process flow, the wax left inside the vehicle body cavity forms a uniform protective wax film, so that the water droplets can enter without gaps, ensuring The vehicle has good anti-corrosion properties.
After the automobile body is built, it will be tested for five to ten years or even longer. During this period, the environment may be very bad. Rusted (oxidized) is the basic chemical property of many metals. It will slowly occur at room temperature. Especially for iron and steel materials commonly used in automobiles, once iron is rusted, the iron oxides produced will absorb water molecules in the air and cause serious damage. Corrosion. From the material point of view, as long as steel is used, there is no way to avoid rust. Galvanized steel also cannot completely prevent rust.
Anti-rust treatment of automobiles is mainly concentrated on the body. The body in the manufacturing process is called "white body." In the process of manufacture, the body-in-white has been treated with “cathode electrophoretic coating†to prevent rust, but this does not prevent the occurrence of rust in the cavity.
There are many cavities in the car body. These cavities are very important to increase the body strength and reduce the weight of the car body. In the ordinary anti-rust coating process, these cavities cannot be processed. To prevent this galvanic corrosion from occurring inside the cavity, the technician invented the cavity injection wax technique.
When making parts with cavities, the wax injection holes are generally already reserved in advance. Note that the wax hole is generally small. In such places as the stringers, there are no special openings at all, but injections are made at the top of the stringers. After welding, the body-in-white undergoes basic rust-prevention treatment and enters the process of wax injection. The beginning of the wax injection process is performed with hot air. Generally, the temperature at this time is about 85 degrees, which is higher than the hot air temperature during the car wash. After heating the entire vehicle body, heat the special internal cavity rust-proof wax to 115 degrees, and use a special pump to inject the already dissolved wax into the previously reserved wax injection hole, and keep the excess wax liquid flowing out for a certain period of time. The final thickness of the wax film is about a few hundred microns. Then enter the cooling zone and blow it to room temperature with cold air. Finally, all the wax injection holes were sealed.
Volkswagen is the first domestic automaker to introduce wax injection technology. 120 kg of wax was injected into the body cavity, and after a certain period of time, a kilogram of wax remaining in the car formed a uniform protective film on the surface of the cavity.
At present, domestic brands, Chery also introduced the cavity injection wax technology, the new model A3 that uses this technology to manufacture the body, in the domestic brands won a lot of word of mouth.
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