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WO2018066007A9 - Procédé galvanique et thermique visant à obtenir la coloration de métaux, en particulier de métaux précieux - Google Patents

Procédé galvanique et thermique visant à obtenir la coloration de métaux, en particulier de métaux précieux Download PDF

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Publication number
WO2018066007A9
WO2018066007A9 PCT/IT2016/000230 IT2016000230W WO2018066007A9 WO 2018066007 A9 WO2018066007 A9 WO 2018066007A9 IT 2016000230 W IT2016000230 W IT 2016000230W WO 2018066007 A9 WO2018066007 A9 WO 2018066007A9
Authority
WO
WIPO (PCT)
Prior art keywords
per
galvanic
phase
metals
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IT2016/000230
Other languages
English (en)
Other versions
WO2018066007A1 (fr
Inventor
Ester Falletta
Oliver Bellina
Roberto FIORELLI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet Plating SRL
Original Assignee
Valmet Plating SRL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valmet Plating SRL filed Critical Valmet Plating SRL
Priority to PCT/IT2016/000230 priority Critical patent/WO2018066007A1/fr
Publication of WO2018066007A1 publication Critical patent/WO2018066007A1/fr
Publication of WO2018066007A9 publication Critical patent/WO2018066007A9/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/34—Pretreatment of metallic surfaces to be electroplated
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/10—Electroplating with more than one layer of the same or of different metals
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/48—After-treatment of electroplated surfaces
    • C25D5/50—After-treatment of electroplated surfaces by heat-treatment
    • 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
    • C25D3/38—Electroplating: Baths therefor from solutions of copper
    • 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
    • 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
    • C25D3/56—Electroplating: Baths therefor from solutions of alloys
    • C25D3/58—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of copper
    • 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
    • C25D3/56—Electroplating: Baths therefor from solutions of alloys
    • C25D3/62—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of gold
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/005—Jewels; Clockworks; Coins

Definitions

  • the present invention refers to a technology with the purpose of obtaining particular colorations of objects, in particular on metal objects.
  • the invention refers to an innovative method which allows to obtain special color tones generally not obtainable with known techniques, in particular in metals and more particularly in precious metals for decorative purposes.
  • the production of precious objects can be processed by the known galvanic deposition process.
  • objects made of bronze or brass are processed by galvanic deposition in such a manner that mechanical and also technical characteristics are improved, especially if they are objects for the fashion industry or for jewelry industry in general.
  • colors such as orange, violet, red, blue and green cannot be obtained generally.
  • the present invention concerns a method to obtain the coloration of an object, preferably but not necessarily a metallic object.
  • the method comprising a phase of deposit of an external material on the object and a thermal treatment phase which foresees the heating of the object to a predetermined temperature for a preset period.
  • the two phases are not necessarily in said sequential order.
  • a bath which constitutes the so-called galvanic bath, containing a water-based solution of salt of the metal to be deposited
  • two electrodes are immerged: the cathode is constituted by the object to be covered, while the anode can be constituted by the metal which has to be deposited, by another inert metal or by graphite.
  • a difference of potential is imposed to such electrodes by means of a power generator. In such conditions, the cations of the metal to be deposited will move towards the cathode (negatively charged) while anions will move towards the anode (positively charged) .
  • cyanide baths Some baths, as those used for the deposit of noble metals such as silver and gold, use also a solution of cyanide ions and for this reason they are called "cyanide baths". This kind of bath reguires, by law, qualified operators for the use of cyanide, such qualification is recognized by a renewable license. Rhodium, nickel, copper, chrome, palladium, ruthenium, silver, copper, tin, zinc and their alloys are other commonly used metals in electroplating.
  • electrolytes can be selected from: electrolytes for the deposit of gold-iron alloys from citrate matrix, electrolytes for the deposit of gold-cobalt alloys from citrate matrix, electrolytes for the deposit of palladium- iron alloys from alkaline ammoniac matrix, electrolytes for the deposit of palladium-indium alloys from alkaline ammoniac matrix, electrolytes for the deposit of palladium-iron alloys from acid matrix, electrolytes for the deposit of gold-copper-cadmium, gold-copper-zinc and gold-copper-indium ternary alloys from alkaline matrix, acid electrolytes on sulphate and sulphammate base for the deposit of rhodium and rut
  • the thickness of deposited layers is usually comprised between 0, 0001 ⁇ and 200 pm for non-precious metals; preferably, between 0,001 and 100 ym; more preferably, between 0,1 and 50 ym.
  • the heating cycle can foresee the insertion of the object, which is at room temperature, inside a stove/oven at room temperature as well.
  • the stove/oven is turned on in order to bring it to the desired temperature (to the so-called set point temperature) , keeping it to such temperature for a predetermined period in order to cool it in calm air (but, possibly, also in moving air; for example, in forced air flow), for example, simply turning off the stove/oven.
  • a reducing atmosphere for example, hydrogen (H 2 ) , ammonia (NH 3 ) , carbon, carbon monoxide (CO) , molecular sulphur ;
  • an inert atmosphere for example nitrogen (N 2 ) , argon (Ar) , helium (He), vacuum.
  • the operative temperature (the so called "set- point" temperature for the thermal treatment, determined on the basis of the required coloration, of the base material and of the galvanic cycle to which the object is submitted) ;
  • the residence of the specimen and/or product inside the stove/oven will be less than 240 min, preferably, less than 120 min, more preferably less than 60 min.
  • Colors obtained with the above described two phases method of the present invention can be, for example, regulated from yellow to orange, red, brown, violet, from blue to green, by varying conveniently the alloy and/or deposited metal/s and their related thermal treatment.
  • Base material brass (a specimen for the test is a small brass plate of 5 x 3 cm with 0,3 cm thickness) .
  • Electrolytic degreasing for 1 min
  • cyanide-free degreasing cathode treatment
  • Plating with gold-iron alloy (0,2 ym; alloy composition: Au 98%, Fe 2% in p/p) obtained by weakly acid electrolyte with citrate matrix pH 4,5, gold from gold salt (I), cyanide and iron, as iron sulphate; operative conditions: 40°C, 1 A/dm 2 .
  • Coloration parameters (as per coloration coordinates CIEL*a*b*) result as follows:

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electroplating Methods And Accessories (AREA)

Abstract

La présente invention concerne un procédé visant à obtenir la coloration sur un objet, le procédé comprenant une phase de traitement de l'objet par dépôt galvanique et une phase suivante de traitement thermique qui prévoit le chauffage de l'objet à une température prédéterminée pendant une durée prédéfinie.
PCT/IT2016/000230 2016-10-06 2016-10-06 Procédé galvanique et thermique visant à obtenir la coloration de métaux, en particulier de métaux précieux Ceased WO2018066007A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IT2016/000230 WO2018066007A1 (fr) 2016-10-06 2016-10-06 Procédé galvanique et thermique visant à obtenir la coloration de métaux, en particulier de métaux précieux

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2016/000230 WO2018066007A1 (fr) 2016-10-06 2016-10-06 Procédé galvanique et thermique visant à obtenir la coloration de métaux, en particulier de métaux précieux

Publications (2)

Publication Number Publication Date
WO2018066007A1 WO2018066007A1 (fr) 2018-04-12
WO2018066007A9 true WO2018066007A9 (fr) 2018-08-23

Family

ID=57539576

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2016/000230 Ceased WO2018066007A1 (fr) 2016-10-06 2016-10-06 Procédé galvanique et thermique visant à obtenir la coloration de métaux, en particulier de métaux précieux

Country Status (1)

Country Link
WO (1) WO2018066007A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202300000294A1 (it) * 2023-01-12 2024-07-12 Galvanica Gmp Srl Metodo di rivestimento in lega d’oro di un corpo metallico

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1712244A (en) * 1924-12-11 1929-05-07 Bek Process of finishing metal articles and the product thereof
GB1395146A (en) * 1970-10-21 1975-05-21 Corillium Corp Gold-plating
EP2312021B1 (fr) * 2009-10-15 2020-03-18 The Swatch Group Research and Development Ltd. Procédé d'obtention d'un dépôt d'alliage d'or jaune par galvanoplastie sans utilisation de métaux toxiques
US20130277225A1 (en) * 2010-12-10 2013-10-24 Royal Canadian Mint Method to Produce Golden Bronze by Diffusion of Tin Into Copper Under Controlled Conditions

Also Published As

Publication number Publication date
WO2018066007A1 (fr) 2018-04-12

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