CHROMIUM-FREE PASSIVATED FILM-COVERED TINNED PLATE AND PREPARATION METHOD THEREFOR

WIPO Patent Application WO/2023/061396

A1

A chromium-free passivated film-covered tinned plate, a passivation treatment solution for manufacturing a passivation film, and a manufacturing method for a tinned plate. The chromium-free passivated film-covered tinned plate comprises a tinned plate and a polyester thin film laminated on the surface of the tinned plate. The tinned plate comprises a substrate, a tinned layer and a passivation film covering the surface of the tinned layer. The passivation film does not contain chromium, and contains 2.0-20 mg/m2 of zinc and 10-60 mg/m2 of silicon. The solvent in the passivation treatment solution is water, and the solution contains 0.5-5.0 wt% of a zinc salt and 10-30 wt% of an organosiloxane or a polysiloxane. The manufacturing method for the tinned plate comprises: (1) electroplating tin on a steel substrate to form a tinned layer; and (2) subjecting the steel substrate having the tinned layer to a soft melting treatment to form an iron-tin alloy layer; (3) spray-coating a passivation treatment solution to form a tinned plate having a passivation film; (4) squeezing dry the tinned plate; (5) hot air drying; and (6) thermally compounding a polyester film onto the surface of the tinned plate which has been subjected to a surface treatment.

WANG ZHANGWEI (CN)
WEI JUNSHENG (CN)
LI PENG (CN)
CHEN HONGXING (CN)
NI HUA (CN)

PCT/CN2022/124793

April 20, 2023

October 12, 2022

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BAOSHAN IRON & STEEL (CN)

B32B15/18

CN105331966A	2016-02-17
CN111304706A	2020-06-19
CN104451636A	2015-03-25
CN102257185A	2011-11-23
CN108950613A	2018-12-07

WATSON & BAND INTELLECTUAL PROPERTY AGENT LTD. (CN)

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