Search International and National Patent Collections

1. (WO2018146041) METHOD FOR ELECTRODEPOSITING ZINC AND ZINC ALLOY COATINGS FROM AN ALKALINE COATING BATH WITH REDUCED DEPLETION OF ORGANIC BATH ADDITIVES

Pub. No.:    WO/2018/146041    International Application No.:    PCT/EP2018/052779
Publication Date: Fri Aug 17 01:59:59 CEST 2018 International Filing Date: Tue Feb 06 00:59:59 CET 2018
IPC: C25D 3/56
C25D 17/10
B23K 5/18
C23C 4/06
C23C 4/11
C25D 21/18
C25D 21/14
Applicants: DR.-ING. MAX SCHLÖTTER GMBH & CO. KG
Inventors: WOHLFARTH, Volker
KRAUSS, Ralph
ZÖLLINGER, Michael
Title: METHOD FOR ELECTRODEPOSITING ZINC AND ZINC ALLOY COATINGS FROM AN ALKALINE COATING BATH WITH REDUCED DEPLETION OF ORGANIC BATH ADDITIVES
Abstract:
The present invention relates to a method for electrodepositing zinc and zinc alloy coatings from an alkaline coating bath with reduced depletion of organic bath additives. This involves using as an anode an electrode which is insoluble in the bath, contains metallic manganese and/or manganese oxide and is produced from metallic manganese or a manganese-containing alloy, wherein the manganese-containing alloy contains at least 5% by weight manganese, or is produced from an electrically conductive carrier and a coating containing metallic manganese and/or manganese oxide that is applied thereto, or is produced from a composite material, wherein both the coating containing metallic manganese and/or manganese oxide and the composite material contain with respect to the total amount of manganese at least 5% by weight of manganese that is obtained from metallic manganese and manganese oxide. The method according to the invention is particularly suitable for the electrodepositing of zinc-nickel alloy coatings from alkaline zinc-nickel baths, since the formation of cyanides can be suppressed very effectively.