EP 0909839 B1 20021211 - Galvanic hard chromium layer
Title (en)
Galvanic hard chromium layer
Title (de)
Galvanische Hartchromschicht
Title (fr)
Couche de chrome dur galvanique
Publication
Application
Priority
DE 19745811 A 19971016
Abstract (en)
[origin: EP0909839A1] A hard chromium electroplate, with an anodically widened crack network incorporating solid particles, comprises two or more layers having different crystalline forms. An Independent claim is also included for production of the above electroplate by (a) depositing a first hard chromium layer (2) onto a cathodically connected workpiece (1) using pulsed d.c. (preferably at 5-250 A/dm<2> current density) and a sulfuric acid plating electrolyte containing dispersed solid particles; (b) depositing a hard chromium coating (3) using constant d.c.; (c) connecting the workpiece as an anode so that the crack network (4) of the coating (3) is widened and filled with solid particles; and (d) repeating the above steps until the desired overall electroplate thickness is achieved.
IPC 1-7
IPC 8 full level
C25D 15/02 (2006.01); F16J 9/26 (2006.01); C25D 5/14 (2006.01); C25D 5/18 (2006.01)
CPC (source: EP US)
C25D 15/02 (2013.01 - EP US); C25D 5/14 (2013.01 - EP US); C25D 5/18 (2013.01 - EP US); C25D 5/617 (2020.08 - EP US); C25D 5/625 (2020.08 - EP US)
Designated contracting state (EPC)
DE ES FR GB IT
DOCDB simple family (publication)
EP 0909839 A1 19990421; EP 0909839 B1 20021211; DE 19745811 A1 19990422; DE 19745811 C2 20020613; DE 59806614 D1 20030123; ES 2184184 T3 20030401
DOCDB simple family (application)
EP 98118677 A 19981002; DE 19745811 A 19971016; DE 59806614 T 19981002; ES 98118677 T 19981002