US 11,732,373 B2
Method and device for the galvanic application of a surface coating
Karl Müll, Volketswil-Kindhausen (CH); and Thomas Bolch, Abstatt (DE)
Assigned to TOPOCROM SYSTEMS AG, Neuhausen am Rheinfall (CH)
Filed by TOPOCROM SYSTEMS AG, Neuhausen am Rheinfall (CH)
Filed on Sep. 3, 2021, as Appl. No. 17/466,159.
Application 17/466,159 is a continuation of application No. 15/773,734, granted, now 11,136,685, previously published as PCT/EP2015/075850, filed on Nov. 5, 2015.
Prior Publication US 2021/0395912 A1, Dec. 23, 2021
Int. Cl. C25D 5/04 (2006.01); C25D 5/08 (2006.01); C25D 5/34 (2006.01); C25D 7/04 (2006.01); C25D 21/04 (2006.01); C25D 3/06 (2006.01); C25D 5/14 (2006.01); C25D 5/36 (2006.01); C25D 7/00 (2006.01); C25D 17/02 (2006.01); C25D 21/02 (2006.01); C25D 21/14 (2006.01); C25D 21/12 (2006.01)
CPC C25D 3/06 (2013.01) [C25D 5/04 (2013.01); C25D 5/14 (2013.01); C25D 5/36 (2013.01); C25D 7/00 (2013.01); C25D 17/02 (2013.01); C25D 21/02 (2013.01); C25D 21/04 (2013.01); C25D 21/14 (2013.01); C25D 21/12 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A process for electrochemical application of a surface coating to a body, said surface coating being a chromium coating, where the electrochemical application of the surface coating is carried out in a reactor in at least a two-stage process comprising the steps of:
providing a chromic acid containing solution having a temperature T1 as a first electrolyte solution,
providing a chromic acid containing solution having a temperature T2≠T1 as a second electrolyte solution,
electrochemically applying in a first process step a first portion of said surface coating being said chromium coating using said first electrolyte solution having the temperature T1, and
thereafter electrochemically applying in a second process step a second portion of said surface coating being said chromium coating using said second electrolyte solution having the temperature T2≠T1,
wherein said first electrolyte solution having the temperature T1 present in the reactor is replaced by the second electrolyte solution having the temperature T2≠T1 for carrying out said second process step,
wherein said reactor is a closed reactor, and
the replacement of the first electrolyte solution having the temperature T1 by the second electrolyte solution having the temperature T2≠T1 is carried out by introduction of the second electrolyte solution having the temperature T2≠T1 into the reactor through an inlet being arranged in a bottom plate of the reactor or in a lower third of the reactor, and resulting displacement of the first electrolyte solution having the temperature T1, due to introduction of the second electrolyte solution into the reactor and pushing the first electrolyte solution out of the reactor, through an outlet being arranged in an upper third of the reactor.