US2847372A - Method of electrolytically coating a metallic object with platinum - Google Patents

Method of electrolytically coating a metallic object with platinum Download PDF

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Publication number
US2847372A
US2847372A US610675A US61067556A US2847372A US 2847372 A US2847372 A US 2847372A US 610675 A US610675 A US 610675A US 61067556 A US61067556 A US 61067556A US 2847372 A US2847372 A US 2847372A
Authority
US
United States
Prior art keywords
platinum
gms
metallic object
layer
chloroplatinic acid
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.)
Expired - Lifetime
Application number
US610675A
Other languages
English (en)
Inventor
Dijksterhuis Popko Reinder
Hovingh Albertus Remko
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.)
US Philips Corp
North American Philips Co Inc
Original Assignee
US Philips Corp
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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US2847372A publication Critical patent/US2847372A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • C25D3/50—Electroplating: Baths therefor from solutions of platinum group metals
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/922—Static electricity metal bleed-off metallic stock
    • Y10S428/9265—Special properties
    • Y10S428/929—Electrical contact feature
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/922—Static electricity metal bleed-off metallic stock
    • Y10S428/9335—Product by special process
    • Y10S428/934—Electrical process
    • Y10S428/935—Electroplating

Definitions

  • My invention relates to methods of electrolytically coating metallic objects, particularly molybdenum, with platinum.
  • molybdenum has been plated with platinum using electrolytic baths containing in addition to a platinum salt, another metal salt, such as a lead salt, capable of increasing the platinum deposit from the bath.
  • a platinum salt such as a lead salt
  • some of the metal other than platinum is plated out together with the platinum and cannot be separated from the platinum in the coating. This is highly disadvantageous for certain purposes namely where the molybdenum object is to serve as an electrode of an electric discharge tube.
  • a principal object of my invention therefore, is to develop a process for electrolytically coating metallic objects with platinum which eliminates the presence of any undesired metallic contaminate in the finally sintered platinum layer.
  • a second principal object of my invention is to increase the platinum output of the electrolytic bath used in coating metallic objects with platinum.
  • Still another object of my invention is to increase the thickness of the platinum layer deposited by the electrolytic process.
  • the electrolytic coating step I prefer to utilize a relatively high current density i: e. 50-150 amps./cm.
  • the object to be coated is molybdenum
  • this initial thin layer may then be coated by subsequent thick layers.
  • Example A molybdenum wire having a thickness of 175 .0 was passed through an electrolytic bath 30 cms. in length consisting of an aqueous solution containing 240 gms. of chloroplatinic acid and 7 gms. of mercuric chloride per liter, at a speed of meters per hour. During this operation a current of 1.5 amps. was passed through the solution, the molybdenum wire being connected to the cathode.
  • the wire After sintering at 1000 C. the wire was found to have a coating of substantially pure platinum from 0.5 to 0.7 thick. By repeating this operation a number of times it was found possible to build up substantially pure, dense platinum layers up to 10p. thick.
  • a method of electrolytically coating a metallic object with platinum comprising the steps, immersing the metallic object in an electrolytic bath comprising an aqueous solution of chloroplatinic acid (H PtCl and mercuric chloride, the concentration of the chloroplatinic acid being from about to 300 gms. per liter and the concentration of the mercuric chloride being about 1 to 15 gms. per liter, while passing a suitable current through the bath for a time sufficient to deposit a layer of platinum black of the desired thickness, and sintering said layer at a temperature of about 1000 C. to convert it to platinum substantially free of mercury.
  • chloroplatinic acid H PtCl and mercuric chloride

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electroplating And Plating Baths Therefor (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Electrolytic Production Of Metals (AREA)
US610675A 1955-10-19 1956-09-18 Method of electrolytically coating a metallic object with platinum Expired - Lifetime US2847372A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL350850X 1955-10-19

Publications (1)

Publication Number Publication Date
US2847372A true US2847372A (en) 1958-08-12

Family

ID=19785034

Family Applications (1)

Application Number Title Priority Date Filing Date
US610675A Expired - Lifetime US2847372A (en) 1955-10-19 1956-09-18 Method of electrolytically coating a metallic object with platinum

Country Status (7)

Country Link
US (1) US2847372A (enrdf_load_stackoverflow)
BE (1) BE551868A (enrdf_load_stackoverflow)
CH (1) CH350850A (enrdf_load_stackoverflow)
DE (1) DE1033478B (enrdf_load_stackoverflow)
FR (1) FR1158715A (enrdf_load_stackoverflow)
GB (1) GB810818A (enrdf_load_stackoverflow)
NL (1) NL87771C (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3267009A (en) * 1962-10-08 1966-08-16 Engelhard Ind Inc Electrodeposition of platinum containing minor amounts of bismuth
US3276976A (en) * 1962-02-13 1966-10-04 Air Prod & Chem Method of making a fuel cell electrode
US4240878A (en) * 1979-11-02 1980-12-23 Sybron Corporation Method of forming a platinum layer on tantalum
EP0043461A1 (en) * 1980-06-19 1982-01-13 SORIN BIOMEDICA S.p.A. Process for manufacturing electrodes for cardiac stimulators
US6306277B1 (en) 2000-01-14 2001-10-23 Honeywell International Inc. Platinum electrolyte for use in electrolytic plating

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025011737A1 (en) * 2023-07-07 2025-01-16 Luma Metall Ab A coated tungsten and/or molybdenum object and manufacturing method thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US921943A (en) * 1907-06-27 1909-05-18 Meaker Co Process for electrically coating with tin or allied metals.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US921943A (en) * 1907-06-27 1909-05-18 Meaker Co Process for electrically coating with tin or allied metals.

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3276976A (en) * 1962-02-13 1966-10-04 Air Prod & Chem Method of making a fuel cell electrode
US3267009A (en) * 1962-10-08 1966-08-16 Engelhard Ind Inc Electrodeposition of platinum containing minor amounts of bismuth
US4240878A (en) * 1979-11-02 1980-12-23 Sybron Corporation Method of forming a platinum layer on tantalum
EP0043461A1 (en) * 1980-06-19 1982-01-13 SORIN BIOMEDICA S.p.A. Process for manufacturing electrodes for cardiac stimulators
US6306277B1 (en) 2000-01-14 2001-10-23 Honeywell International Inc. Platinum electrolyte for use in electrolytic plating
US6521113B2 (en) 2000-01-14 2003-02-18 Honeywell International Inc. Method of improving the oxidation resistance of a platinum modified aluminide diffusion coating

Also Published As

Publication number Publication date
NL87771C (enrdf_load_stackoverflow)
GB810818A (en) 1959-03-25
CH350850A (de) 1960-12-15
DE1033478B (de) 1958-07-03
FR1158715A (fr) 1958-06-18
BE551868A (enrdf_load_stackoverflow)

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