We often see a series of spray painting in the process of sheet metal processing. Many people are puzzled by this and do not know how important this process is. Today, Huazhi will explain to you the importance and characteristics of sheet metal processing and painting process.
There are generally four steps in the spray painting process. First, the base layer is treated, then a layer of primer is applied, then a layer of intermediate paint is added, and finally the surface layer is applied. Below I will describe the features of each step.
1. Base layer treatment The base layer of sheet metal processing products needs to be derusted first, such as sandblasting, phosphating, etc.
2. Primer The zinc-rich epoxy primer is used in sheet metal processing. The purpose of this layer of primer is to protect the steel structure and steel products and prevent rust. Its coating film has good physical and chemical properties, is easy to construct, and has good matching performance. The main components are: epoxy resin, epoxy curing agent, zinc powder, anti-rust pigment, auxiliary agent and organic solvent, etc.
3. The intermediate paint sheet metal processing products use epoxy micaceous iron intermediate paint, which is used together with epoxy zinc-rich primer as a transition layer of long-term anti-corrosion coating, and its function is to enhance the sealing and anti-corrosion of composite coating. , can also be used as anti-corrosion and anti-rust primer. The coating film is strong and tough, has good adhesion and sealing, and is well matched with the front and rear coatings. Its components are: epoxy resin and curing agent, iron oxide and anti-rust pigment, etc.
4. There are many types of spray paints that can be used for the surface layer, such as epoxy asphalt topcoat, chlorinated rubber topcoat, acrylic and polyurethane topcoat, and fluorocarbon topcoat.
The above content is an introduction to the importance and characteristics of the sheet metal processing and painting process. If this process is not done, the service life of the sheet metal material will be greatly reduced. There are also matters that we need to pay attention to in the process of sheet metal processing technology, which also requires everyone's attention.