13-02-2014 дата публикации
Номер: US20140042033A1
The invention relates to methods and plating baths for electrodepositing a dark chromium layer on a workpiece. The trivalent chromium electroplating baths comprise sulphur compounds and the methods for electrodepositing a dark chromium layer employ these trivalent chromium electroplating baths. The dark chromium deposits and workpieces carrying dark chromium deposits are suited for application for decorative purposes. 114-. (canceled)16. The electroplating bath according to claim 15 , wherein the sulphur containing compounds having the general Formula (I) are selected from compounds wherein Ris not H if Ris H or Ris not H if Ris H.19. The electroplating bath according to claim 15 , wherein{'sup': '1', 'Ris —OH, and'}{'sup': '2', 'sub': 2', 'q', '2', 'q', '2', '2, 'Ris selected from the group consisting of —(CH—)—OH and —(CH—)—S(CH—)—OH; and'}{'claim-ref': {'@idref': 'CLM-00015', 'claim 15'}, 'q has the meaning as defined in .'}21. The electroplating bath according to claim 15 , wherein the coloring agent is selected from the group of sulphur containing compounds comprising:(1) 2-(2-Hydroxy-ethylsulfanyl)-ethanol,(2) Thiazolidine-2-carboxylic acid,(3) Thiodiglycol ethoxylate,(4) 2-Amino-3-ethylsulfanyl-propionic acid,(5) 3-(3-Hydroxy-propylsulfanyl)-propan-1-ol,(6) 2-Amino-3-carboxymethylsulfanyl-propionic acid,(7) 2-Amino-4-methylsulfanyl-butan-1-ol,(8) 2-Amino-4-methylsulfanyl-butyric acid,(9) 2-Amino-4-ethylsulfanyl-butyric acid,(10) 3-Carbamimidoylsulfanyl-propane-1-sulfonic acid,(11) 3-Carbamimidoylsulfanyl-propionic acid,(12) Thiomorpholine,(13) 2-[2-(2-Hydroxy-ethylsulfanyl)-ethylsulfanyl]-ethanol,(14) 4,5-Dihydro-thiazol-2-ylamine,(15) Thiocyanic acid,(16) 2-Amino-4-methanesulfinyl-butyric acid,(17) 1,1-Dioxo-1,2-dihydro-1lambda*6*-benzo[d]isothiazol-3-one,(18) Prop-2-yne-1-sulfonic acid,(19) Methanesulfinylmethane, and(20) 2-(1,1,3-Trioxo-1,3-dihydro-1lambda*6*-benzo[d]isothiazol-2-yl)ethanesulfonic acid.22. The electroplating bath according to claim 15 , ...
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