Several common surface treatment methods for sheet metal chassis processing are: wire drawing, sandblasting, baking paint, powder spraying, electroplating, anodizing, and silk printing. Since the surface of some sheet metal materials does not have the ability to prevent rust and corrosion, effective surface treatment is very necessary. Surface treatment of sheet metal parts can improve the service life of products in harsh environments, or in order to achieve specific surface effects or functions.
Among sheet metal processing materials, cold-rolled sheets and hot-rolled sheets are not corrosion-resistant, and oxidation reactions are prone to occur, and the corrosion continues to deepen. Cause sheet metal processing parts to lose performance or be scrapped. Therefore, it is necessary to achieve the purpose of anti-corrosion and anti-rust through surface treatment. What are the surface technologies of sheet metal processing?
Sheet metal processing surface treatment painting process
①The base layer of sheet metal processing products should be derusted first. Such as: sandblasting, phosphating, etc.
②Epoxy zinc-rich primer for sheet metal processing products is mainly used for anti-rust primer for steel structures and steel products. The 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 pigments, additives and organic solvents, etc.
③Epoxy cloud iron intermediate paint for sheet metal processing products: it is used in conjunction with epoxy zinc-rich primer as a long-term anti-corrosion coating transition layer. Anti-corrosion and anti-rust primer. The coating film is tough, has good adhesion and sealing, and has good compatibility with the front and rear coats. Its components are: epoxy resin and curing agent, iron oxide and anti-rust pigments.
④ Sheet metal processing products as surface layer. Its surface layer can be used for epoxy asphalt topcoat, chlorinated rubber topcoat, acrylic and polyurethane topcoat, fluorocarbon topcoat, etc.
4. Plastic spraying (also called powder spraying)
It means that the powder is polarized and evenly adheres to the surface of the product with the opposite polarity under the action of the electric field force. Features of plastic spraying: good wear resistance and corrosion resistance, relatively thick film, suitable for relatively thick products such as cabinets and equipment, low cost, and plastic powder can be recycled. Commonly used materials for this surface treatment process: cold-rolled sheet, hot-rolled sheet, etc.
Electrostatic powder spraying is mainly to polarize the paint (powder) through electrodes, and then charge the object to be sprayed with the opposite charge, and the powder will evenly adhere to the surface of the object under the action of the electric field force.
5. Electroplating
Through chemical reaction, a layer of other metal is attached to the surface of the material to increase the anti-corrosion performance of the metal and achieve a certain effect of beautifying the appearance. It is a commonly used surface treatment method. Such as: electro-galvanized, electro-nickel, etc. Mainly colorful zinc plating, blue and white zinc plating, black zinc plating, chrome plating. Commonly used materials for this surface treatment process: cold-rolled sheet, hot-rolled sheet, etc.
