The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 11, 2013
Filed:
Jan. 15, 2008
Jaroslava Krizova, Lucany n.N., CZ;
Vaclav Kriz, Lucany n.N., CZ;
Jiri Kloubek, Jablonec n.N., CZ;
Björn Dingwerth, Berlin, DE;
Jaroslava Krizova, Lucany n.N., CZ;
Vaclav Kriz, Lucany n.N., CZ;
Jiri Kloubek, Jablonec n.N., CZ;
Björn Dingwerth, Berlin, DE;
Atotech Deutschland GmbH, Berlin, DE;
Abstract
The invention relates to a treatment solution for producing substantially chromium(VI) free black conversion layers on alloy layers containing zinc, the solution comprising the following: (i) at least one first carboxylic acid having 1 to 8 carbon atoms, the acid containing no polar groups with exception of the carboxyl group and being a monocarboxylic acid, (ii) at least one second carboxylic acid having 1 to 8 carbon atoms, comprising at least one further polar group that is selected from —OH, —SOH, —NH, —NHR, —NR, —NR, and —COOH (wherein R is a C-Calkyl group), (iii) 20 to 400 mmol/l Crand (iv) 50 to 2000 mmol/l NO. The invention further provides a method for the black passivation of surfaces containing zinc, wherein the surface to be treated is immersed into such a treatment solution.