US2984604A - Platinum plating composition and process - Google Patents
Platinum plating composition and process Download PDFInfo
- Publication number
- US2984604A US2984604A US753525A US75352558A US2984604A US 2984604 A US2984604 A US 2984604A US 753525 A US753525 A US 753525A US 75352558 A US75352558 A US 75352558A US 2984604 A US2984604 A US 2984604A
- Authority
- US
- United States
- Prior art keywords
- platinum
- solution
- sulfamic acid
- bath
- liter
- 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
Links
Images
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
- Y10S428/9335—Product by special process
- Y10S428/934—Electrical process
- Y10S428/935—Electroplating
-
- 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
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
- Y10T428/12625—Free carbon containing component
-
- 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
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12861—Group VIII or IB metal-base component
- Y10T428/12875—Platinum group metal-base component
-
- 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
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12861—Group VIII or IB metal-base component
- Y10T428/12944—Ni-base component
Definitions
- This invention relates to a platinum electrolyte from which it is possible to plate thick layers of stress free platinum and to the process for making the same.
- Thcse baths operate erratically, apparently due to inconsistent cathode efficiency and (in the case with the P-salt bath) occasionally cease operating altogether.
- Among other objects of the invention is to provide a platinum plating bath suitable for making electroformed platinum articles plated in one continuous operation.
- One phase of this invention is based on the discovery that when the P-salt, Pt(NH (NO) is heated with an aqueous solution of sulfamic acid it dissolves therein.
- Another phase of the invention is based on the discovery that the solution obtained by heating the P-salt with the sulfamic acid can be diluted to provide a stable electrolytic solution for electroplating stress free platinum or for electroforming platinum articles.
- the objects of the invention are attained by heating the platinum diamino dinitrite in a sulfamic acid aqueous solution in the proportions of about 10-40 or more g. of P-salt per -200 cc. of sulfamic acid solution containing about 2 to about 400 g./liter of sulfamic acid, until a clear solution is obtained. Thereafter, the solution is diluted to provide a solution containing at least about 6 g. per liter of platinum (which corresponds to about 10 g. per liter of the P-salt). Articles are then electroplated or electroformed from this solution by conventional processes.
- Platinum plating of thick deposits of platinum in this low stress bath can be done in one operation, i.e., there is no need for intermittently scratch brushing or burnishing to produce a smooth deposit.
- Platinum plating with this low stress bath can be performed on a specification basis, i.e.,
- constant electrodeposition eificiency is obtained at constant temperature and platinum metal content. For example, uniform deposits will be obtained on a series of articles by electroplating each in the bath for one minute.
- the sulfamic acid above is calculated as pure acid although it may be added as a solution, if desired.
- Platinum metal replenishment is accomplished by the addition of the electrolyte as such to maintain the platinum metal at the desired concentration. Solution level is maintained by the additiot f both this replenisher and water.
- the drawing is a reproduction of a photomicrograph of a specimen of platinum plated graphite made according to the invention.
- Example 50 grams of a sulfamic acid (NH SO H) in 200 cc. of water is heated to about. C. whereupon 20 g. of platinum diamino dinitrite are added with stirring. The stirring and heating is continued until a clear solution is obtained. It has not been possible to determine the composition of the resulting salt in the solution at the present time but it is probably a fairly complex compound.
- the resultant solution is diluted with water to make 1 liter of solution and is then ready for electroplating.
- the platinum is plated at a voltage of about 1 volt to 3 volts and at a current density of about 20 amps. per square foot.
- the proportion of sulfamic acid of P-salt can vary from about 1:10 to about 20:1.
- the electroplating bath should have a concentration of at least about 6 g. of Pt per liter for otherwise spongy deposits result.
- the bath of the invention is stable as long as it is operated.
- the form may be coated with resist material where no plating is desired, the plating on the exposed surface is continued without interruption until the desired thickness is built-up and thereafter the original form is separated from the plated deposit.
- the removal of the basis metal from the deposit results in the production of a continuous film of platinum metal showing the lack of internal stress of the plated metal. In other words the platinum metal does not disintegrate into flakes or small pieces.
- an adherent layer of platinum has been plated on graphite.
- the throwing power of the bath is excellent as can be seen from the fact that the platinum penetrated into the pores of the graphite as shown in the drawing. A protective layer of nickel was deposited thereon before cutting the section which was photographed.
- a process for electroplating relatively thick layers of stress-free platinum comprisingdissolving platinum diamino dinitrite inan aqueous solution of sulfamicacid containing a sufiicient amountof sulfamic acid to dissolve said platinum diamino dinitrite, adding waterto the resultant solution to provide a solution containingat least 6 g./ liter of platinum metal andelectrolyzing said solution to plate out platinum therefrom.
- a process for electroplating relatively thick layers of stress free platinum comprising providing a solution of about 10-40 g./liter of platinum diamino dinitrit'e in 15200 cc. of aqueous sulfamic acid solution containing about 2 to about 400 g./liter of sulfamic acid, adding water to said solution to provide a solution containing 6 g./ liter of platinum and electrolyzing said solution to plate out platinum therefrom.
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)
Description
Claims (1)
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL241991D NL241991A (en) | 1958-08-06 | ||
NL123540D NL123540C (en) | 1958-08-06 | ||
US753525A US2984604A (en) | 1958-08-06 | 1958-08-06 | Platinum plating composition and process |
GB22070/59A GB856405A (en) | 1958-08-06 | 1959-06-26 | Low stress platinum platings and composition |
FR801231A FR1231410A (en) | 1958-08-06 | 1959-07-27 | Process for electroplating a layer of platinum |
ES0251564A ES251564A1 (en) | 1958-08-06 | 1959-07-30 | Platinum plating composition and process |
CH7655959A CH392195A (en) | 1958-08-06 | 1959-08-04 | Process for making an electrolyte |
DES64330A DE1144074B (en) | 1958-08-06 | 1959-08-06 | Bath for the galvanic deposition of thick, tension-free platinum coatings |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US753525A US2984604A (en) | 1958-08-06 | 1958-08-06 | Platinum plating composition and process |
Publications (1)
Publication Number | Publication Date |
---|---|
US2984604A true US2984604A (en) | 1961-05-16 |
Family
ID=25031005
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US753525A Expired - Lifetime US2984604A (en) | 1958-08-06 | 1958-08-06 | Platinum plating composition and process |
Country Status (7)
Country | Link |
---|---|
US (1) | US2984604A (en) |
CH (1) | CH392195A (en) |
DE (1) | DE1144074B (en) |
ES (1) | ES251564A1 (en) |
FR (1) | FR1231410A (en) |
GB (1) | GB856405A (en) |
NL (2) | NL123540C (en) |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3122424A (en) * | 1961-12-13 | 1964-02-25 | King L D Percival | Graphite bonding method |
US3206382A (en) * | 1959-09-30 | 1965-09-14 | Johnson Matthey Co Ltd | Electrodeposition of platinum or palladium |
US3235392A (en) * | 1960-10-11 | 1966-02-15 | Automatic Telephone & Elect | Electroless deposition of palladium |
US3296102A (en) * | 1961-08-01 | 1967-01-03 | Exxon Research Engineering Co | Catalysts and electrodes for electrochemical cells |
US3309292A (en) * | 1964-02-28 | 1967-03-14 | Richard L Andrews | Method for obtaining thick adherent coatings of platinum metals on refractory metals |
US3366464A (en) * | 1962-12-17 | 1968-01-30 | Snecma | Method of coating graphite with a refractory coating and products obtained by such method |
US3433682A (en) * | 1965-07-06 | 1969-03-18 | American Standard Inc | Silicon coated graphite |
US3484210A (en) * | 1964-10-19 | 1969-12-16 | Henry J Pinter | Alloy coated carbon and graphite members having conductors soldered thereto |
US3671408A (en) * | 1971-05-25 | 1972-06-20 | Sel Rex Corp | Rhodium-platinum plating bath and process |
US4895750A (en) * | 1988-03-28 | 1990-01-23 | General Dynamics Corp., Pomona Division | High-temperature tensile test specimen and methods of fabrication |
EP0358375A1 (en) * | 1988-09-07 | 1990-03-14 | Johnson Matthey Public Limited Company | Platinum or platinum alloy plating bath |
US5078843A (en) * | 1988-03-28 | 1992-01-07 | General Dynamics Corporation Air Defense Systems Division | Method for fabricating high-temperature tensile test specimens |
US5620583A (en) * | 1995-04-15 | 1997-04-15 | Degussa Aktiengesellschaft | Platinum plating bath |
WO2022129461A1 (en) * | 2020-12-18 | 2022-06-23 | Umicore Galvanotechnik Gmbh | Stabilization of the deposition rate of platinum electrolytes |
CN115925449A (en) * | 2022-12-30 | 2023-04-07 | 浙江朗德电子科技有限公司 | Preparation method of functional electrode for tail gas sensor chip |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1356353A (en) * | 1963-02-12 | 1964-03-27 | Louyot Comptoir Lyon Alemand | Process for the electrolytic deposition of a layer of platinum and electrolyte for carrying out the process |
NL124423C (en) * | 1963-03-20 | |||
US4673472A (en) * | 1986-02-28 | 1987-06-16 | Technic Inc. | Method and electroplating solution for deposition of palladium or alloys thereof |
DE19547900C2 (en) * | 1995-04-15 | 1997-10-02 | Degussa | Galvanic platinum bath |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1779436A (en) * | 1929-07-02 | 1930-10-28 | Baker & Co Inc | Process of electrodepositing metals of the platinum group |
US1921941A (en) * | 1931-03-12 | 1933-08-08 | Johnson Matthey Co Ltd | Electrodeposition of palladium |
US2027358A (en) * | 1931-03-12 | 1936-01-07 | Johnson Matthey Co Ltd | Electrodeposition of metals of the platinum group |
-
0
- NL NL241991D patent/NL241991A/xx unknown
- NL NL123540D patent/NL123540C/xx active
-
1958
- 1958-08-06 US US753525A patent/US2984604A/en not_active Expired - Lifetime
-
1959
- 1959-06-26 GB GB22070/59A patent/GB856405A/en not_active Expired
- 1959-07-27 FR FR801231A patent/FR1231410A/en not_active Expired
- 1959-07-30 ES ES0251564A patent/ES251564A1/en not_active Expired
- 1959-08-04 CH CH7655959A patent/CH392195A/en unknown
- 1959-08-06 DE DES64330A patent/DE1144074B/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1779436A (en) * | 1929-07-02 | 1930-10-28 | Baker & Co Inc | Process of electrodepositing metals of the platinum group |
US1921941A (en) * | 1931-03-12 | 1933-08-08 | Johnson Matthey Co Ltd | Electrodeposition of palladium |
US2027358A (en) * | 1931-03-12 | 1936-01-07 | Johnson Matthey Co Ltd | Electrodeposition of metals of the platinum group |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3206382A (en) * | 1959-09-30 | 1965-09-14 | Johnson Matthey Co Ltd | Electrodeposition of platinum or palladium |
US3235392A (en) * | 1960-10-11 | 1966-02-15 | Automatic Telephone & Elect | Electroless deposition of palladium |
US3296102A (en) * | 1961-08-01 | 1967-01-03 | Exxon Research Engineering Co | Catalysts and electrodes for electrochemical cells |
US3122424A (en) * | 1961-12-13 | 1964-02-25 | King L D Percival | Graphite bonding method |
US3366464A (en) * | 1962-12-17 | 1968-01-30 | Snecma | Method of coating graphite with a refractory coating and products obtained by such method |
US3309292A (en) * | 1964-02-28 | 1967-03-14 | Richard L Andrews | Method for obtaining thick adherent coatings of platinum metals on refractory metals |
US3484210A (en) * | 1964-10-19 | 1969-12-16 | Henry J Pinter | Alloy coated carbon and graphite members having conductors soldered thereto |
US3433682A (en) * | 1965-07-06 | 1969-03-18 | American Standard Inc | Silicon coated graphite |
US3671408A (en) * | 1971-05-25 | 1972-06-20 | Sel Rex Corp | Rhodium-platinum plating bath and process |
US4895750A (en) * | 1988-03-28 | 1990-01-23 | General Dynamics Corp., Pomona Division | High-temperature tensile test specimen and methods of fabrication |
US5078843A (en) * | 1988-03-28 | 1992-01-07 | General Dynamics Corporation Air Defense Systems Division | Method for fabricating high-temperature tensile test specimens |
EP0358375A1 (en) * | 1988-09-07 | 1990-03-14 | Johnson Matthey Public Limited Company | Platinum or platinum alloy plating bath |
US5620583A (en) * | 1995-04-15 | 1997-04-15 | Degussa Aktiengesellschaft | Platinum plating bath |
WO2022129461A1 (en) * | 2020-12-18 | 2022-06-23 | Umicore Galvanotechnik Gmbh | Stabilization of the deposition rate of platinum electrolytes |
CN115925449A (en) * | 2022-12-30 | 2023-04-07 | 浙江朗德电子科技有限公司 | Preparation method of functional electrode for tail gas sensor chip |
CN115925449B (en) * | 2022-12-30 | 2023-11-07 | 浙江朗德电子科技有限公司 | Preparation method of functional electrode for tail gas sensor chip |
Also Published As
Publication number | Publication date |
---|---|
NL241991A (en) | |
ES251564A1 (en) | 1959-12-16 |
CH392195A (en) | 1965-05-15 |
DE1144074B (en) | 1963-02-21 |
GB856405A (en) | 1960-12-14 |
FR1231410A (en) | 1960-09-29 |
NL123540C (en) |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: OXY METAL INDUSTRIES CORPORATION Free format text: CHANGE OF NAME;ASSIGNOR:OXY METAL FINISHING CORPORATION;REEL/FRAME:003967/0084 Effective date: 19741220 |
|
AS | Assignment |
Owner name: HOOKER CHEMICALS & PLASTICS CORP. Free format text: MERGER;ASSIGNOR:OXY METAL INDUSTRIES CORPORATION;REEL/FRAME:004075/0885 Effective date: 19801222 |
|
AS | Assignment |
Owner name: OCCIDENTAL CHEMICAL CORPORATION Free format text: CHANGE OF NAME;ASSIGNOR:HOOKER CHEMICAS & PLASTICS CORP.;REEL/FRAME:004126/0054 Effective date: 19820330 |