The advantages and application of tinplate metal packaging box

  Tinplate (electroplated tin sheet-SPTE) refers to cold-rolled low-carbon sheet or steel strip plated with commercial pure tin on both sides, also called tin-plated iron. Tin mainly plays a role in preventing corrosion and rust. It combines the strength and formability of steel with the corrosion resistance, solderability and beautiful appearance of tin in a single material. It has the characteristics of corrosion resistance, non-toxicity, high strength and good ductility.

　The characteristics of tin plate vary with tin plating method, plating thickness and surface treatment method. But it is the composition of the tin-plated original plate that has no essential influence on the characteristics. The tin plate is composed of five layers of steel substrate, tin-iron alloy layer, tin layer, oxide film and oil film. It is worth noting that a layer of tin-iron alloy is produced between the steel substrate and the tin layer. This is produced by reflow treatment and passivation treatment after tin plating on the steel plate. It not only acts as a mediator, makes tin firmly adhere to the surface of the steel plate, but also brightens the tin layer and compensates for the pores in the tin plating layer. , Improve the corrosion resistance of steel plate.

     Generally speaking, the thickness of the tin-plated layer is 0.5-2.0 μm, and the thickness of the tin layer in the hot-dip tin method is greater than that in the electro-tin method. Although the tin layer on top is very thin, it is a very useful protective layer. After the iron sheet is electroplated, it is not only beautiful, but also has many excellent characteristics. The chemical nature of tin is very stable. It will not react chemically with water. Even if it is kept in contact with moist air for a long time, it will only gradually form a dense oxide film on its surface, an ultra-thin steel strip. It can prevent the continued oxidation of tin, which is the reason why the tin-plated iron sheet resists corrosion.

　　The metal packaging is mainly made of tinplate. The quality of the tinplate is the best in Japan, Germany, Taiwan and the United States. Because the texture of the tinplate is soft and flexible, it is easy to shape different shapes. Generally, products packaged in tinplate are targeted at the high-end market. The main consumer markets for tinplate packaging in the world are in Europe and America. Tinplate boxes are mainly used for food packaging, while others are used for wine, chocolate and tea packaging. Secondly, the tobacco industry has a huge market because these products require sealed tinplate packaging.