Method for passivating the surface of a tinplate and electrolysis system for carrying out the method

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United States of America Patent

PATENT NO 12065754
APP PUB NO 20230109499A1
SERIAL NO

17958551

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Abstract

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In a method for passivating the surface of a tinplate using electrolytic deposition of a passivation layer containing chromium oxide/chromium hydroxide on the surface, the electrolytic deposition of the passivation layer is carried out at least partly from an electrolyte solution which contains a trivalent chromium compound, at least one salt for increasing the conductivity and at least one acid or one base for adjusting a desired pH value and is free from organic complexing agents and free from buffering agents. In order to increase the amount of chromium oxide in the passivation layer, after the electrolytic deposition of the passivation layer, the passivated tinplate is subjected to a thermal treatment in which the passivated tinplate is kept at a treatment temperature of 100° C. or more for a treatment time of at least 0.5 seconds.

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Patent Owner(s)

Patent OwnerAddress
THYSSENKRUPP RASSELSTEIN GMBH56626 ANDERNACH

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bergholz, Birgit Mendig, DE 1 0
Menzel, Gerhard Bell, DE 4 8
Molls, Christoph Bonn, DE 5 7

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