US2765269A - Bath for plating bright gold - Google Patents

Bath for plating bright gold Download PDF

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US2765269A
US2765269A US470136A US47013654A US2765269A US 2765269 A US2765269 A US 2765269A US 470136 A US470136 A US 470136A US 47013654 A US47013654 A US 47013654A US 2765269 A US2765269 A US 2765269A
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bath
cyanide
gold
nickel
alkali metal
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Barnet D Ostrow
Fred I Nobel
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/944—Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/48—Electroplating: Baths therefor from solutions of gold
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/011—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more purifying devices arranged in parallel
    • F01N13/017—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more purifying devices arranged in parallel the purifying devices are arranged in a single housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
    • F01N3/2846—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration specially adapted for granular supports, e.g. pellets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/30—Arrangements for supply of additional air
    • F01N3/34—Arrangements for supply of additional air using air conduits or jet air pumps, e.g. near the engine exhaust port
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having thermal insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/08—Granular material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/04—Filling or emptying a chamber with granular material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention is directed to electroplating baths, more particularly to a gold cyanide plating bath adapted to produce bright deposits which no not require brushing or bufling.
  • Gold plating baths capable of producing bright depOSitshaVe been known and used.
  • the degree of brightness obtained by such baths has been about equivalent to the brightness obtained by the use of present day bright nickel baths.
  • Such bright gold baths required certain special equipment of a highly specialized character in order to obtain-(the optimum results in the operation. Such equipment required close attention and a high degree of skill on the part of the operator. Therefore there has been a need for a bath which was adapted to give bright gold deposits without the necessity of special equipment or special attention on the part of the operat-or.
  • the present invention is intended and adapted to overcome the disadvantages inherent in prior bright gold baths, it being among the objects of the present invention M a bath which is capable of reproducing in the gold depo it the brightness present in the basis metal.
  • a cyanide bath of well-known character consisting essentially of gold cyanide and free alkali metal cyanide in solution with water.
  • two types of substances one of which is a condensation product of certain carboxylic acids and certain amino acids.
  • a soluble nickel salt and/or a soluble tin salt there is also present in the bath in relatively small amount.
  • the invention also contemplates the presence at the same time of both nickel and tin salts.
  • the condensation product is made by reacting a fatty acid having from 8 to 18 carbon atoms with an amino acid.
  • the resulting condensation product is believed to have the following structural formula:
  • M represents hydrogen and alkali metal
  • R represents an alkyl radical having 7 to 17 carbon atoms
  • R represents a lower fatty acid, an alkyl monoalcohol, ester thereof, ether thereof, the alkyl radicals of which have 1 to 3 carbon atoms and hydrogen
  • R represents methylene, ethylene and propylene, together with a water soluble salt of a metal taken from the class consisting of nickel and/or tin.
  • the amount of said condensation product ranges from 1 to 100 grams per liter and good results are obtained by the use of 2530 grams per liter in the bath.
  • the nickel may be present in the form of any soluble salt thereof which does not interfere with the plating operation, such as the sulphate, cyanide and the like, the amount of nickel present in the bath ranging from 0.10 to 50 grams per liter. Any such salt will upon addition to the bath form complex alkali metal cyanide.
  • the tin is also present as a solublecompound and it has been found that an excellent form is that of alkali metal stannates, the amount of tin present in the bath ranging from 0.01 to 20 grams per liter. Mixtures of salts of this character may be added to the bath.
  • the following are specific examples showing a number of baths which are suitable for the present purposes.
  • the formulas of the following examples show the relative amounts of the constituents in grams per liter. Electroplating takes place at temperatures between 70 and F. with vigorous agitation for the best results. The current densities range from 0 to 20 amperes per square foot, depending on the gold concentration.
  • Example 1 Gold as KAu cyanide 7.5 Nickel as KzNi cyanide 3.0 Potassium stannate 4.0 Free potassium cyanide 80.0 N-methylglycine-lauric acid potassium salt 20.0
  • Example 2 Gold as KAu cyanide 10.0 Potassium stannate 6.0 Free potassium cyanide 90.0 N-ethanolglycine-myristic acid sodium salt 30.0
  • Example 3 Gold as KAu cyanide 4.5 Nickel as Ni sulphate 20.0 Free potassium cyanide 15.0 N-acetylglycinemyristic acid-sodium salt 25.0
  • Example 4 Gold as KAu cyanide 5.5 Nickel as KzNi cyanide 3.5 Free potassium cyanide 20.0 N-ethyletherglycine-oleic acid sodium salt 35.0
  • Such compounds made from sarcosine have been mentioned in the prior art for use in silver cyanide plating baths.
  • gold deposits obtained from gold cyanide plating baths containing such condensation products are not bright when the bath contains only these complex condensation products as brighteners. It is only when there is present in the bath in addition thereto of a soluble compound of tin or nickel, or a mixture of such compounds of the two metals, that bright gold deposits can be obtained. And the optimum brightness of such deposits are obtained when both tin and nickel are present together with the organic condensation product.
  • M represents a radical taken from the class consisting of hydrogen and alkali metal
  • R represents an alkyl radical having-7 to 17 carbon atom's
  • 'l1 represents a radical taken from the class'consisting of a lower fatty acid, an alkyl monoalcohol, ester thereof, ether thereof,
  • R" represents a radical taken from the class consisting of methylene, ethylene and propylene, the amount of said reaction product being from-1 to 100 ms./ liter, together with the water soluble salts of nickel and tin in sufficient amount to exert a brightening eifcct on the plated gold.
  • the improvernerlt which comprises the addition of said bath-of a condensation product of a fatty acid having 8 to .18 carbon atoms with an amino acid and having the following structural formula:
  • M represents a radical taken from the class consistingof hydrogen and alkali metal
  • R represents an alkyl radical having 7 to 17 carbon atoms
  • R represents a radical taken from the class consisting of a lower fatty acid, an alkyl monoalcohol, ester thereof, ether thereof, the alkyl radicals of which have 1 to 3 carbon atoms and hydrogen
  • R" represents a radical taken frorn'the class consisting of methylene, ethylene and propylene
  • reaction product is about 25-30 g ns/liter, together with the water-soluble salts of nickel and tin in sufficient amount to exerta brightening effect on the plated gold.
  • M represents a radical taken from the class consisting of hydrogenand alkali metal
  • R represents an alkyl radical having 7 to 17 carbon atoms
  • R represents a radical taken from the class consisting of a lower fatty acid, an alkyl mono-alcohol, ester thereof, ether thI60ll the alkyl radicals of which have 1 to 3 carbon atoms and hydrogen
  • R" represents a radical taken from the class consisting of methylene, ethylene and propylene.
  • Tin as alkali metal stannate 0.01-20
  • Nickel as soluble nickel salt 0.10- Condensation product of fatty and amino acid 1-100 said tin and nickel being present -in sufficientamount to. exert a brightening efiect,said condensation product being of N-methyl.
  • glycine With. an acid taken fronl the/- class consisting of" oleic, stearic, palmitic, laf ricaand myristic; i 1:
  • M' represents a radical taken from the class consisting of hydrogen and alkali metal
  • R represents an alkyl radical'having 7 to 17 carbon atoms
  • R represents a radical taken from the class consisting of a lower fatty acid, an alkyl monoalcohol, ester thereof, ether thereof, the alkyl radicals of which have 1 to 3 carbon atoms and hydrogen
  • R represents a radical 'taken from the class consisting of methylene, ethylene and propylene, the amount of said reaction product being about 1400 grams per liter, together with the Water-soluble salts of nickel and till, the amount of nickel being from 0.1 to 50 to said bath of the following composition in gr'amspcr' said tin and nickel being present in sufficient amount to exert a brightening effect
  • said condensation product being of N-methyl glycine with the mixed acids of coconut type oil.

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  • Engineering & Computer Science (AREA)
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Description

United States Patent BATH FOR PLATING BRIGHT GOLD Barnet D. Ostrow, North Bellmore, and Fred I. Nobel, North Valley Stream, N. Y.
N0 Drawing. Application November 19, 1954, Serial No. 470,136
7 Claims. (Cl. 204-46 The present invention is directed to electroplating baths, more particularly to a gold cyanide plating bath adapted to produce bright deposits which no not require brushing or bufling.
Gold plating baths capable of producing bright depOSitshaVe been known and used. The degree of brightness obtained by such baths has been about equivalent to the brightness obtained by the use of present day bright nickel baths. However, such bright gold baths required certain special equipment of a highly specialized character in order to obtain-(the optimum results in the operation. Such equipment required close attention and a high degree of skill on the part of the operator. Therefore there has been a need for a bath which was adapted to give bright gold deposits without the necessity of special equipment or special attention on the part of the operat-or.
The present invention is intended and adapted to overcome the disadvantages inherent in prior bright gold baths, it being among the objects of the present invention M a bath which is capable of reproducing in the gold depo it the brightness present in the basis metal.
It is also among'the objects of the present invention to provide a bathgiving a bright gold deposit which requires no scratch brushing or coloring.
It is further among the objects of the present invention to provide a bath of the character described, which is simple in operation, which is easy to control and which is capable of providing optimum operating results.
In practicing the present invention there is provided a cyanide bath of well-known character consisting essentially of gold cyanide and free alkali metal cyanide in solution with water. In accordance with the invention, there is added to the bath two types of substances, one of which is a condensation product of certain carboxylic acids and certain amino acids. There is also present in the bath in relatively small amount a soluble nickel salt and/or a soluble tin salt. The invention also contemplates the presence at the same time of both nickel and tin salts.
The condensation product is made by reacting a fatty acid having from 8 to 18 carbon atoms with an amino acid. The resulting condensation product is believed to have the following structural formula:
wherein M represents hydrogen and alkali metal, R represents an alkyl radical having 7 to 17 carbon atoms, R represents a lower fatty acid, an alkyl monoalcohol, ester thereof, ether thereof, the alkyl radicals of which have 1 to 3 carbon atoms and hydrogen, and R represents methylene, ethylene and propylene, together with a water soluble salt of a metal taken from the class consisting of nickel and/or tin. The amount of said condensation product ranges from 1 to 100 grams per liter and good results are obtained by the use of 2530 grams per liter in the bath.
The nickel may be present in the form of any soluble salt thereof which does not interfere with the plating operation, such as the sulphate, cyanide and the like, the amount of nickel present in the bath ranging from 0.10 to 50 grams per liter. Any such salt will upon addition to the bath form complex alkali metal cyanide. The tin is also present as a solublecompound and it has been found that an excellent form is that of alkali metal stannates, the amount of tin present in the bath ranging from 0.01 to 20 grams per liter. Mixtures of salts of this character may be added to the bath.
The following are specific examples showing a number of baths which are suitable for the present purposes. The formulas of the following examples show the relative amounts of the constituents in grams per liter. Electroplating takes place at temperatures between 70 and F. with vigorous agitation for the best results. The current densities range from 0 to 20 amperes per square foot, depending on the gold concentration.
Example 1 Gold as KAu cyanide 7.5 Nickel as KzNi cyanide 3.0 Potassium stannate 4.0 Free potassium cyanide 80.0 N-methylglycine-lauric acid potassium salt 20.0
Example 2 Gold as KAu cyanide 10.0 Potassium stannate 6.0 Free potassium cyanide 90.0 N-ethanolglycine-myristic acid sodium salt 30.0
Example 3 Gold as KAu cyanide 4.5 Nickel as Ni sulphate 20.0 Free potassium cyanide 15.0 N-acetylglycinemyristic acid-sodium salt 25.0
Example 4 Gold as KAu cyanide 5.5 Nickel as KzNi cyanide 3.5 Free potassium cyanide 20.0 N-ethyletherglycine-oleic acid sodium salt 35.0
Example 5 Gold as NaAu cyanide 9.0 Sodium stannate 5.5 Free sodium cyanide 25.0
N-methylrnethylateglycine-stearic acid sodium salt 20.0
Methods of making the condensation products of the fatty acids and amino acids are well-known.
Such compounds made from sarcosine have been mentioned in the prior art for use in silver cyanide plating baths. However, gold deposits obtained from gold cyanide plating baths containing such condensation products, are not bright when the bath contains only these complex condensation products as brighteners. It is only when there is present in the bath in addition thereto of a soluble compound of tin or nickel, or a mixture of such compounds of the two metals, that bright gold deposits can be obtained. And the optimum brightness of such deposits are obtained when both tin and nickel are present together with the organic condensation product.
Such a combination has an important advantage in connection with the operation of the bath. The presence of the condensation product increases substantially the tolerance of the plating bath for organic impurities and contamination. While in the prior art it had been suggested to use other precious metals for the purpose of producing bright gold deposits, such additions increase costs to a substantial extent and Fnrflnm-mnw. a... 1U 1U.
wherein M represents a radical taken from the class consisting of hydrogen and alkali metal, R represents an alkyl radical having-7 to 17 carbon atom's,'l1 represents a radical taken from the class'consisting of a lower fatty acid, an alkyl monoalcohol, ester thereof, ether thereof,
the alkyl radicals of which have 1 to 3 carbon atoms and hydrogen, and R" represents a radical taken from the class consisting of methylene, ethylene and propylene, the amount of said reaction product being from-1 to 100 ms./ liter, together with the water soluble salts of nickel and tin in sufficient amount to exert a brightening eifcct on the plated gold.
2. In a bright gold plating bath conslstingessentially" of gold cyanide and free alkali metal cyanide in water,
solution, the improvernerltwhich comprises the addition of said bath-of a condensation product of a fatty acid having 8 to .18 carbon atoms with an amino acid and having the following structural formula:
R-fil-N-R b it"COOM.
wherein M represents a radical taken from the class consistingof hydrogen and alkali metal, R represents an alkyl radical having 7 to 17 carbon atoms, R represents a radical taken from the class consisting of a lower fatty acid, an alkyl monoalcohol, ester thereof, ether thereof, the alkyl radicals of which have 1 to 3 carbon atoms and hydrogen, and R" represents a radical taken frorn'the class consisting of methylene, ethylene and propylene, the
amount of said reaction product being about 25-30 g ns/liter, together with the water-soluble salts of nickel and tin in sufficient amount to exerta brightening effect on the plated gold.
3. In a bright gold plating bath consisting essentially of gold cyanide and free alkali metal cyanidein water gnls./liter and the amount of tin being from 0.01 to 20 gins/liter: f
4. In a bright gold plating bath consisting essentially of gold cyanide and free alkali metal cyanide in water solution, the improvement which comprises the addition to said bath of the following composition in grams per liter:
Tin as alkali metalstannate 0.0120
Nickel as soluble nickel salt 0.l050 Condensation product of fatty and amino acid 1-100 said tin and nickel'being present, in suflicient amount to exert a brightening effect, said condensation product having the following structural formula:
wherein M represents a radical taken from the class consisting of hydrogenand alkali metal, R represents an alkyl radical having 7 to 17 carbon atoms, R represents a radical taken from the class consisting of a lower fatty acid, an alkyl mono-alcohol, ester thereof, ether thI60ll the alkyl radicals of which have 1 to 3 carbon atoms and hydrogen, and R" represents a radical taken from the class consisting of methylene, ethylene and propylene.
5. In a bright gold plating bath consisting essentially of gold cyanide and free alkali metal cyanide in water q solution, the improvement, which comprises the addition to said bath of the'following composition in grams perliter: Y
Tin as alkali metal stannate 0.01-20 Nickel as soluble nickel salt 0.10- Condensation product of fatty and amino acid 1-100 said tin and nickel being present -in sufficientamount to. exert a brightening efiect,said condensation product being of N-methyl. glycine With. an acid taken fronl the/- class consisting of" oleic, stearic, palmitic, laf ricaand myristic; i 1:
6. In a bright gold plating bath consistingies'sentially of gold cyanide and free alkali metal cyanide inwater' solution, the improvement which comprises the addition solution, the improvement which comprises the addition to said bath of a condensation product of a fatty acid having '8 to 18 carbon atoms with an amino acid and havingthe following structural formula:
wherein M'represents a radical taken from the class consisting of hydrogen and alkali metal, R represents an alkyl radical'having 7 to 17 carbon atoms, R represents a radical taken from the class consisting of a lower fatty acid, an alkyl monoalcohol, ester thereof, ether thereof, the alkyl radicals of which have 1 to 3 carbon atoms and hydrogen, and R represents a radical 'taken from the class consisting of methylene, ethylene and propylene, the amount of said reaction product being about 1400 grams per liter, together with the Water-soluble salts of nickel and till, the amount of nickel being from 0.1 to 50 to said bath of the following composition in gr'amspcr' said tin and nickel being present in sufficient amount to exert a brightening effect, said condensation product being of N-methyl glycine with the mixed acids of coconut type oil.
7. A bath according to claim 1 in which the amino acid is a glycine.
References'Cited inthe file of this patent FOREIGN PATENTS France Feb. 18, 1953 OTHER REFERENCES Serial No. 351,241, Weiner (A. P. C), published May 18, 1943.
liter: 7 j Tin as alkali metal stannate @0101-20." Nickel as soluble nickel salt 0 ,l0-50"* Condensation product of fatty and amino acid 1-1 00

Claims (1)

1. IN A BRIGHT GOLD PLATING BATH CONSISTING ESSENTIALLY OF GOLD CYANIDE AND FREE ALKALI METAL CYANIDE IN WATER SOLUTION, THE IMPROVEMENT WHICH COMPRISES THE ADDITION TO SAID BATH OF A CONDENSATION PRODUCT OF A FATTY ACID HAVING 8 TO 18 CARBON ATOMS WITH AN AMINO ACID AND HAVING THE FOLLOWING STRUCTURAL FORMULA:
US470136A 1954-11-19 1954-11-19 Bath for plating bright gold Expired - Lifetime US2765269A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2905601A (en) * 1957-08-13 1959-09-22 Sel Rex Corp Electroplating bright gold
US3057789A (en) * 1959-02-26 1962-10-09 Paul T Smith Gold plating bath and process
US3309293A (en) * 1964-11-16 1967-03-14 Elechem Corp Copper cyanide electroplating bath
US3373094A (en) * 1964-08-26 1968-03-12 Sel Rex Corp Gold and gold alloy electroplating

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1021637A (en) * 1950-07-07 1953-02-20 Stuart Murray Ltd Improvement of rollers intended for inking devices of printing machines

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1021637A (en) * 1950-07-07 1953-02-20 Stuart Murray Ltd Improvement of rollers intended for inking devices of printing machines

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2905601A (en) * 1957-08-13 1959-09-22 Sel Rex Corp Electroplating bright gold
US3057789A (en) * 1959-02-26 1962-10-09 Paul T Smith Gold plating bath and process
US3373094A (en) * 1964-08-26 1968-03-12 Sel Rex Corp Gold and gold alloy electroplating
US3309293A (en) * 1964-11-16 1967-03-14 Elechem Corp Copper cyanide electroplating bath

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