Tinplate passivation is a chemical treatment applied after tin deposition that stabilizes the surface characteristics of tinplate by controlling the formation and development of tin oxide. This process is carried out to avoid oxidation not only during manufacturing, but also in subsequent operations such as varnishing. In addition, passivation provides a surface that is chemically more suitable for lithography and varnishing and gives a certain protective hardness to the tinplate. The passivation process can use different solutions such as chromic acid, chromium phosphate, sodium dichromate or sodium carbonate, and is carried out by applying an electrical voltage that generates a very thin protective layer of chromic oxide on the tinplate.
equivalence between annealing and tinplate hardness
Tinplate manufacturing process
Main varnishing defects in tinplate?
Differences between tinplate and tfs
THE AGREED EUROPEAN ALTERNATIVE FOR THE PASSIVATION OF ELECTROLYTIC TINPLATE IS CFPA
HEXAVALENT CHROMIUM-FREE PASSIVATION ALTERNATIVE FOR TINPLATE CONTAINERS
SUPERFICIAL TREATMENTS THE COATED MATERIALS
FACTORS AFFECTING VARNISHING OF THE TIN
LOW COATED STEELS TIN
