High adhesion tinplate and method for manufacturing same

Abstract

This invention relates to the field of alloy materials technology and discloses a high-adhesion tin-plated sheet and its manufacturing method. The preparation method includes sequentially pre-treating a steel strip, electroplating with tin, remelting, passivation, rinsing, drying, cooling, and oiling to obtain a tin-plated sheet. The drying step employs a combination of hot air drying and high-frequency induction heating to dry the passivation film of a specific thickness. This promotes the full conversion of Cr(OH)3 on the surface of the passivation film to Cr2O3, removes the water of crystallization from the surface of the passivation film, and achieves stable control of the Cr(OH)3 content in the passivation film at 10%-20%. This solves the problem of poor adhesion caused by high Cr(OH)3 content in existing technologies, enabling the tin-plated sheet obtained by this invention to consistently achieve Grade 1 adhesion. It is widely applicable to various surfaces such as B-side, R-side, S-side, and M-side, and can be used with a tin plating amount of 1.1 g / m². 2 -11.2g / m 2 Tin-plated sheet.

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