US 12,065,753 B2
Method and composition for selective anodization
André Egli, Kriens (CH); Georg Andersohn, Ranstadt (DE); Julia Dukwen, Erkelenz (DE); and Frédéric Cours, Porcelette (FR)
Assigned to Aalberts Surface Technologies GmbH, Kerpen (DE)
Filed by Aalberts Surface Technologies GmbH, Kerpen (DE)
Filed on Dec. 6, 2022, as Appl. No. 18/062,359.
Claims priority of application No. 21213523 (EP), filed on Dec. 9, 2021.
Prior Publication US 2023/0323557 A1, Oct. 12, 2023
Int. Cl. C25D 11/00 (2006.01); C25D 11/02 (2006.01)
CPC C25D 11/022 (2013.01) [C25D 11/024 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A composition for selective anodization, said composition comprising:
amidosulphuric acid, magnesium sulphate and concentrated sulphuric acid as a base electrolyte, and additionally sodium stannate and/or molybdenum oxide, wherein the composition is free of chromium trioxide.