Multistage pretreatment of tinplate prior to the coating thereof with lacquer

US10011915B2 · kind B2 · utility

Assignee

• Henkel AG & Co. KGaA · DE

Inventors

• Uta Sundermeier · Leichlingen, DE
• Michael Wolpers · Erkrath, DE
• Marcel Roth · Goldkronach, DE
• Jurgen Stodt · Neuss, DE

Key dates

• Filing date: Jul 16, 2013
• Grant date: Jul 3, 2018
• Expiry date: Jul 3, 2034

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C25D11/16
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

The invention relates to a two-stage method for the anti-corrosive pretreatment of tinplate, in which an anti-corrosive primer coating is applied in a first step, in which the tinplate is anodically polarized in an electrolyte containing at least one inert water-soluble salt and is then in a second step, brought in contact with an acidic aqueous composition containing water-soluble inorganic compounds of the elements Zr, Ti, Hf, and/or Si.