① According to the different tin coating process, electrolytic tinplate coil can be divided into two types: hot-dip tin sheet metal and electroplated tin sheet metal. Hot-dip galvanized tin sheet metal is made of tinplate with a liquid coating process. The coating is thicker, the thickness is difficult to control, and the amount of tin consumption is large, so its application is limited; electroplating tin sheet metal is also called cold rolled tinplate, which uses electroplating process on the steel substrate The tin film is uniformly plated on the surface, and the electroplating methods mainly include alkaline electroplating, halogen electroplating and borofluoric acid electroplating.
② Electrolytic tinplate coil can be divided into equal-thickness tin sheet metal and differential-thickness tin sheet metal according to the difference in tin coating thickness on the front and back of the thin steel plate. The equal-thickness tinplate refers to the same tinplate on the front and back of the tinplate. Different thickness tinplate refers to the difference in the amount of tin plating on the front and back of the tinplate.