The tin plating line of Esfahan's Mobarakeh Steel Company has been designed on the basis of acidic electrolyte with ferrostan solution in which the sheet passes through electrolyte cleaning bath, water cleaning, passing through electrolyte pickling and two stages of water cleaning. Finally the sheet enters baths with electrolyte solutions and gets tinned in five stages with the billet forming the anode and the sheet forming the cathode. This method tins both sides of the sheet.
This line allows tinning with various thicknesses of the plating. After the completion of the tin-plating operations, the sheet goes through a muffle furnace with the temperature higher than tin melting point (232 degrees Celsius) and gets cold rapidly in a bath. This not only increases the bonding of the tin on the base metal, it gives the tin plated sheet a shiny surface. The tin-plated sheet enters a chemical operations pool for sedimentation of a layer of chromium.
This is meant to prevent further oxidation and color change due to storage in the warehouse. While it increases bonding of the tin to the base metal and soldering. A thin layer of oil is sprayed on both surfaces of the sheet using electrostatic method in order to protect it from damage while in packaging and transportation. There are numerous applications for tin-plated sheets, including the packaging of foodstuffs, chemicals, drugs, dyestuffs, varnishes, and some applications in the manufacture of parts such as oil, gasoil, air and water filters in vehicles such as lorries, buses, tractors and other heavy-duty vehicles, as well as in the manufacture of light vehicles such as sedans, manufacture of toys, electric batteries, etc.