Patents by Inventor Birgit BERGHOLZ

Birgit BERGHOLZ has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for passivating the surface of a tinplate and electrolysis system for carrying out the method
    Patent number: 12065754
    Abstract: 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.
    Type: Grant
    Filed: October 3, 2022
    Date of Patent: August 20, 2024
    Assignee: thyssenkrupp Rasselstein GmbH
    Inventors: Christoph Molls, Birgit Bergholz, Gerhard Menzel
  • METHOD FOR PASSIVATING THE SURFACE OF A TINPLATE AND ELECTROLYSIS SYSTEM FOR CARRYING OUT THE METHOD
    Publication number: 20230109499
    Abstract: 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.
    Type: Application
    Filed: October 3, 2022
    Publication date: April 6, 2023
    Applicant: thyssenkrupp Rasselstein GmbH
    Inventors: Christoph MOLLS, Birgit BERGHOLZ, Gerhard MENZEL