EP0073568A1
Expired / Lapsed
EP
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Bright chromium plating baths
Assignee: M&T Chemicals Inc
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Filing: 1982-07-21
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Granted: —
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Expires: 2002-07-21
Abstract
Abstract The invention provides a hexavalent chromium plating bath containing chromic acid, an iodine releasing compound and/or a bromine releasing compound such as iodate, periodate, bromate or perbromate, and a carboxylate which is stable in the bath. Exemplary stable carboxylates include acetic acid, propionic acid, chloroacetic acid, trichloroacetic acid, succinic acid, sulfoacetic acid, benzoic acid, picolinic acid, and nicotinic acid. Bright chromium deposits can be produced with these baths at high current efficiencies employing high temperatures with substantially no low current density etch.
Inventors
- 👤 Hyman Chessin
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 08:54
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/04
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
31 words
A hexavalent chromium plating bath containing as additives thereto: (a) a halogen-releasing compound selected from iodine, an iodine-releasing compound, bromine, a bromine-releasing compound and mixtures thereof; and (b) a stable carboxylate.
Claim 2
Dependent Claim
31 words
A hexavalent chromium plating bath containing as additives thereto: (a) a halogen-releasing compound selected from iodine, an iodine-releasing compound, bromine, a bromine-releasing compound and mixtures thereof; and (b) a stable carboxylate.
Claim 3
Dependent Claim
35 words
The chromium plating bath of Claim 1 wherein said iodine-releasing compound is selected from hydroiodic acid and salts thereof, iodic acid and salts thereof, periodic acid and salts thereof, organo iodides, and hydrolyzable metal polyiodides.
Claim 4
Dependent Claim
38 words
The chromium plating bath of Claim 1 or Claim 2 wherein said bromine-releasing compound is selected from hydrobromic acid and salts thereof, bromic acid and salts thereof, perbromic acid and salts thereof, organo bromides, and hydrolyzable metal polybromines.
Claim 5
Dependent Claim
26 words
A hexavalent chromium plating bath containing (a) a halo-oxy ion selected from an iodo-oxy ion, a bromo-oxy ion and mixtures thereof; and (b) a stable carboxylate.
Claim 6
Dependent Claim
26 words
A hexavalent chromium plating bath containing (a) a halo-oxy ion selected from an iodo-oxy ion, a bromo-oxy ion and mixtures thereof; and (b) a stable carboxylate.
Claim 7
Dependent Claim
20 words
The chromium plating bath of Claim 4 wherein said iodo-oxy ion selected from iodate anion, periodic anion and mixtures thereof.
Claim 8
Dependent Claim
24 words
The chromium plating bath of Claim 4 or Claim 5 wherein said bromo-oxy ion is selected from bromate anion, perbromate anion and mixtures thereof.
Claim 9
Dependent Claim
65 words
The chromium plating bath of any preceding claim wherein said carboxylate is selected from a stable monocarboxylic acid having from 2 to 6 carbon atoms, a salt of said stable monocarboxylic acid, an anhydride of said stable monocarboxylic acid, a stable polycarboxylic acid having from 4 to 8 carbon atoms, a salt of said stable polycarboxylic acid and an anhydride of said stable carboxylic acid.
Claim 10
Dependent Claim
69 words
The chromium plating bath of any one of Claims 1 to 6 wherein said carboxylate is selected from a stable monocarboxylic acid having from 2 to 6 carbon atoms, a salt of said stable monocarboxylic acid, an anhydride of said stable monocarboxylic acid, a stable dicarboxylic acid having from 4 to 8 carbon atoms, a salt of said stable dicarboxylic acid and an anhydride of said stable dicarboxylic acid.
Claim 11
Dependent Claim
27 words
The chromium plating bath of Claim 7 or Claim 8 wherein said stable carboxylate further contains a substituent selected from halogen, sulfonate, aromatic and heterocyclin N-containing radicals.
Claim 12
Dependent Claim
32 words
The chromium plating bath of any preceding claim wherein said bath contains chromic acid, added as CrO 3 , the concentration of said CrO 3 being from 200 g/l to 1600 g/l.
Claim 13
Dependent Claim
17 words
The chromium plating bath of Claim 10 wherein the concentration of CrO 3 is about 800 g/l.
Claim 14
Dependent Claim
14 words
The chromium plating bath of any preceding claim which further comprises a catalyst ion.
Claim 15
Dependent Claim
22 words
The chromium plating bath of Claim 12 wherein said catalyst ion is selected from sulfate, borate, fluoride, complex fluoride, chloride and chlorate.
Claim 16
Dependent Claim
40 words
The chromium plating bath of any preceding claim wherein said stable carboxylate is selected from acetic acid, propionic acid, chloroacetic acid, trichloroacetic acid trifluoroacetic acid, succinic acid, benzoic acid, sulfoacetic acid, nicotinic acid, picolinic acid, salts thereof and anhydrides thereof.
Claim 17
Dependent Claim
13 words
The chromium plating bath of any preceding claim which further comprises boric acid.
Claim 18
Dependent Claim
26 words
A process for forming bright chromium deposits on a basis metal comprising electro=depositing chromium on said metal from the chromium plating bath of any preceding claim.
Claim 19
Dependent Claim
19 words
A process according to Claim 16 in which electrodeposition is effected at temperatures from about 25°C to about 60°C.
Claim 20
Dependent Claim
18 words
A process according to Claim 16 in which electrodeposition is effect at temperature from about 40°C to 60°C.
Claim 21
Dependent Claim
20 words
A metal article having a chromium electrodeposit thereon formed by the process of any one of Claims 16 to 18.
Claim 22
Dependent Claim
3 words
CLAIMS FOR AUSTRIA
Claim 23
Dependent Claim
50 words
A process for forming bright chromium deposits on a basis metal comprising electro- depositing chromium on said metal from a hexavalent chromium plating bath containing as additivies thereto: (a) a halogen-releasing compound selected from iodine, an iodine-releasing compound, bromine a bromine-releasing compound and mixtures thereof: and (b) a stable carboxylate.
Claim 24
Dependent Claim
50 words
A process for forming bright chromium deposits on a basis metal comprising electro- depositing chromium on said metal from a hexavalent chromium plating bath containing as additivies thereto: (a) a halogen-releasing compound selected from iodine, an iodine-releasing compound, bromine a bromine-releasing compound and mixtures thereof: and (b) a stable carboxylate.
Claim 25
Dependent Claim
24 words
2, The process of Claim 1 in which electrodeposition is effected at temperatures from about 25°C to about 60°C, particularly from 40°C to 60°C.
Claim 26
Dependent Claim
41 words
A process for forming a chromium electroplating bath comprising adding to a bath containing a source of hexavalent chromium: (a) a halogen-releasing compound selected from iodine, an iodine-releasing compound, bromine a bromine-releating compound and mixtures thereof: and (b) a stable carboxylate.
Claim 27
Dependent Claim
41 words
A process for forming a chromium electroplating bath comprising adding to a bath containing a source of hexavalent chromium: (a) a halogen-releasing compound selected from iodine, an iodine-releasing compound, bromine a bromine-releating compound and mixtures thereof: and (b) a stable carboxylate.
Claim 28
Dependent Claim
34 words
The process of any preceding claim wherein said iodine-releasing compound is selected from hydroiodic acid and salts thereof, iodic acid and salts thereof, periodic acid and salts thereof, organo iodides, and hydrolyzable metal polyiodides.
Claim 29
Dependent Claim
34 words
The process of any preceding claim wherein said bromine-releasing compound is selected from hydrobromic acid and salts thereof, bromic acid and salts thereof, perbromic acid and salts thereof, organo bromides, and hydrolyzable metal poly-bromides.
Claim 30
Dependent Claim
45 words
A process for forming bright chromium deposits on a basis metal comprising electro- depositing chromium on said metal from a hexavalent chromium plating bath containing (a) a halo-oxy ion selected from an iodo-oxy ion, a bromo-oxy ion and mixtures thereof; and (b) a stable carboxylate.
Claim 31
Dependent Claim
45 words
A process for forming bright chromium deposits on a basis metal comprising electro- depositing chromium on said metal from a hexavalent chromium plating bath containing (a) a halo-oxy ion selected from an iodo-oxy ion, a bromo-oxy ion and mixtures thereof; and (b) a stable carboxylate.
Claim 32
Dependent Claim
66 words
The process of any preceding claim wherein said stable carboxylate is selected from a stable monocarboxylic acid having from 2 to 6 carbon atoms, a salt of said stable monocarboxylic acid, an anhydride of said stable monocarboxylic acid, a stable polycarboxylic, preferably dicarboxylic, acid having from 4 to 8 carbon atoms, a salt of said stable polycarboxylic acid and an anhydride of said stable polycarboxylic acid.
Claim 33
Dependent Claim
22 words
The process of Claim 7 Wherein said stable carboxylic further contains a substituent selected from halogen, sulfonate, aromatic and hetero-cyclic N-containing radicals.
Claim 34
Dependent Claim
37 words
The process of any preceding claim wherein the stable carboxylate is selected from acetic acid, propionic acid,chloroacetic acid, trichloroacetic acid, trifluoroacetic acid, sulfoacetic acid, succinic acid, benzoic acid, nicotinic acid, picolinic acid, salts thereof and anhydrides thereof.
Claim 35
Dependent Claim
30 words
The process of any preceding claim wherein said bath contains chromic acid, added as CrO 3 , the concentration of said CrO 3 being from 200 g/l to 1600 g/l.
Claim 36
Dependent Claim
12 words
The process of any preceding claim which further comprises a catalyst ion.
References Cited (Backward Citations)
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