Title:
GALVANIC BATH, METHOD FOR PRODUCING STRUCTURED HARD CHROMIUM LAYERS AND USE THEREOF
Document Type and Number:
WIPO Patent Application WO2000000672
Kind Code:
A3
Abstract:
The invention relates to a galvanic bath, to a method for precipitating chromium onto objects using said galvanic bath, and to the use of this method for producing structured hard chromium layers on machine parts. The galvanic bath contains at least one compound which provides chromium (VI) ions, in an aqueous solution, and comprises a) a quantity of chromium (VI) ions corresponding to 100 to 600 g/l chromic acid anhydride, b) sulphate ions in the form of sulphuric acid and/or a soluble salt thereof, the molar concentration ratio of chromium (VI) ions to sulphate ions (SO4<2->) being 90:1 to 120:1 and c) a quantity of 2-hydroxyethane sulphonate ions corresponding to 0.01 to 3.0 g/l of the sodium salt.
Inventors:
SZAMEITAT KLAUS (DE)
Application Number:
PCT/EP1999/004412
Publication Date:
June 29, 2000
Filing Date:
June 24, 1999
Export Citation:
Assignee:
CROMOTEC OBERFLAECHENTECHNIK G (DE)
SZAMEITAT KLAUS (DE)
SZAMEITAT KLAUS (DE)
International Classes:
B41N7/04; C25D1/00; C25D3/10; C25D5/14; C25D5/16; C25D3/04; C25D5/18; C25D7/00; C25D7/10; (IPC1-7): C25D3/04; C25D3/10; C25D5/14; C25D5/18; C25D7/00
Foreign References:
| DE4432512A1 | 1996-03-14 | |||
| US4588481A | 1986-05-13 | |||
| US4619742A | 1986-10-28 | |||
| DE3402554A1 | 1985-08-08 | |||
| US3506548A | 1970-04-14 | |||
| US5415761A | 1995-05-16 | |||
| DE4211881A1 | 1993-10-14 |
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