Tinplate

Tinplate Tin plate is a thin steel sheet coated by tin. The thin steel sheet on which tin coating is done is known as black plate. Tin has several properties which make it suitable for use as a coating on steel. It has a good resistance to corrosion in a wide range of environments and in particular retains its appearance and surface properties extremely well in indoor atmosphere. It is easily soldered and the good corrosion resistance ensures effective retention of solderability. It is safe in contact with foods, neither producing risks to health nor impairing flavours. The softness of the metal, although disadvantageous for some uses of coatings, has merit for others, facilitating cold working, giving easy running threads on fasteners and helping to seal joints. Tin coatings are applied either by hot dipping or electrolytically coated. Both processes produce coatings which have characteristics of their own. Hot dip tin coating has advantages in being metallurgically bonded to base steel and of producing a smooth bright surface. Electrolytically coating is able to produce a uniform coating of controlled thickness. With electrolytically coating steel sheet can be differentially coated. In such coating heavy side coating is usually marked. The cross section of tin coating on steel sheet is given in Fig 1. Fig 1 Cross section of tin coating on steel sheet Features of tinplate The tinplate has the following features. Appearance – Tinplate is characterized by its beautiful metallic luster. Products with various kinds of surface roughness are produced by selecting the surface finish of the substrate steel sheet. Paintability and printability – Tinplates have excellent paintability and printability. Printing is beautifully finished using various lacquers and inks. Formability and strength – Tinplates have got very good formability and strength. By selecting a...