Coated steel plate is also called coated steel plate. The general term for products that are coated with Sn, Zn, Al, Cr, Pb-Sn alloys, organic coatings and plastics on the surface of low-carbon steel sheets with good deep drawing properties. Commonly used coated (plated) steel sheets include tin-plated sheets, tin-free steel sheets, galvanized steel sheets, aluminum-plated steel sheets, lead-tin alloy steel sheets and organic coated steel sheets. According to different structures, color coated steel sheets can be roughly divided into the following types.
(1) Painted steel plate
The coated steel plate is a galvanized steel plate as the substrate, and the front and back sides of the coated steel plate are painted to ensure its corrosion resistance. The first layer on the front is a primer, usually epoxy primer, because it has strong adhesion to metal, and the back is also coated with epoxy or acrylic resin; the second layer (surface layer) used to use alkyd resin, generally used Polyester paint or acrylic resin paint.
(2) PVC steel plate
There are two types of PVC steel plates, one is produced by coating paste PVC, called coated PVC steel plate; the other is formed and printed or embossed PVC film attached to the steel plate, called film PVC steel plate.
The PVC layer is thermoplastic, and the surface can be thermally processed. For example, embossing can make the surface texture rich, and it is also flexible, can be subjected to secondary processing such as bending, and its corrosion resistance is relatively good.
The disadvantage of the PVC surface layer is that it is easy to age. In order to improve this shortcoming, a new type of composite PVC steel plate with acrylic resin compounded on the surface of PVC has been produced.
(3) Thermal insulation coated steel plate
The heat-insulating coated steel plate is a 15-17mm thick polystyrene foam or rigid polyurethane foam on the back of the color-coated steel plate, which can be used to improve the heat and sound insulation performance of the coated steel plate.
(4) High durability coated steel sheet
According to the good aging resistance of fluoroplastics and acrylic resins, the use of high-durability coated steel plates on the surface coating of steel plates can improve the durability and corrosion resistance of steel plates.
