What is the significance of surface painting for Sheet Metal Processing? Shenyang sheet metal processing manufacturer explains to you: The painting process on the surface of sheet metal is of great significance for sheet metal processing, and surface painting has a protective effect on sheet metal. Sheet metal chassis, cabinets, equipment casings, etc. are exposed to the air and will not oxidize under the protection of the paint layer, so they will not rust and have waterproof and rust proof properties. Sheet metal processing generally selects suitable materials based on the characteristics of the products that need to be processed. Sheet metal processed products are mostly qualitative, so materials and products are also easily corresponded. Sheet metal generally uses many materials, and it is precisely because sheet metal has diverse metal materials and processing procedures that there is no accurate definition for sheet metal.

The spray painting process generally has four steps: first, treat the base layer, then apply a layer of primer, then add a layer of intermediate paint, and finally apply the surface layer. Below are the characteristics of each step.

1. Grassroots treatment. The base layer of sheet metal processing products needs to be treated with rust removal, such as sandblasting, phosphating, etc.

2. Primer. The epoxy zinc rich primer used in sheet metal processing is mainly used to protect steel structures and steel products and prevent rust. Its coating has good physical and chemical properties, is easy to apply, and has good matching performance. The main components are: epoxy resin, epoxy curing agent, zinc powder, anti rust pigment, additives, and solvents.

3. Intermediate paint. The sheet metal processing products use epoxy cloud iron intermediate paint, which is used in conjunction with epoxy zinc rich primer as a long-term anti-corrosion coating transition layer. Its function is to enhance the sealing and anti-corrosion properties of the composite coating, and it can also be used as an anti-corrosion and anti rust primer. The coating is strong and tough, with good adhesion and sealing properties, and has good compatibility with the front and rear coatings. Its components are: epoxy resin and curing agent, carrier iron oxide and anti rust pigment, etc.

4. Surface layer. There are many types of spray paint that can be used for the surface layer, including epoxy asphalt topcoat, chlorinated rubber topcoat, acrylic and polyurethane topcoat, fluorocarbon topcoat, etc.

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