METHOD OF PASSIVATING BELT-LIKE ORIGINAL SHEET

摘要

PROBLEM TO BE SOLVED: To provide a method of passivating a belt-like original sheet which provides an original sheet having high corrosion resistance and good adhesion performance for coatings and organic coatings, being especially suitable as a not-tin-used steel material (TFS or ECCS) for production of can-formed packages and serving as a substitute for tin plates and does not use chromium (VI) harmful to the environment and health in a treatment process, compared with conventional production and passivation methods for not-tin-used steel materials and tin plates.SOLUTION: A method of passivating a belt-like original sheet includes a step of treating the original sheet electrochemically by passing the original sheet through an electrolytic solution to form an inactive surface, a step of rinsing the original sheet and a step of applying an aqueous chromium-free treatment solution to at least one side of the original sheet so as to form a chemical conversion layer for protection against corrosion and an adhesive layer for a coating and an organic coating material.