Patent US2348319A successfully refreshed from Google Patents.
US4212907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pre-treatment for molybdenum or molybdenum-rich alloy articles to be plated
Assignee: United States Department of Energy
•
Filing: 1979-03-22
•
Granted: 1980-07-15
•
Expires: 1999-03-22
Abstract
Abstract This invention is a method for etching a molybdenum or molybdenum-rich alloy surface to promote the formation of an adherent bond with a subsequently deposited metallic plating. In a typical application, the method is used as a pre-treatment for surfaces to be electrolessly plated with nickel. The pre-treatment comprises exposing the crystal boundaries of the surface by (a) anodizing the surface in acidic solution to form a continuous film of gray molybdenum oxide thereon and (b) removing the film.
Inventors
- 👤 Ralph R. Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:28
CPC Classifications
C; C25; C25D; C25D5/00; C25D5/34; C25D5/38; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/1803; C23C18/1824; C23C18/1837; C23C18/1844; C23C18/1848; C25D11/00; C25D11/02; C25D11/26; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12583; Y10T428/1259
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
50 words
A pre-treatment for a surface which is to be provided with a metallic plating deposited from solution, said surface being a material selected from molybdenum and molybdenum-rich alloys, comprising: anodizing said surface in aqueous amino-trimethylenephosphonic acid solution to form thereon a continuous gray molybdenum oxide film, and removing said film.
Claim 2
Dependent Claim
50 words
A pre-treatment for a surface which is to be provided with a metallic plating deposited from solution, said surface being a material selected from molybdenum and molybdenum-rich alloys, comprising: anodizing said surface in aqueous amino-trimethylenephosphonic acid solution to form thereon a continuous gray molybdenum oxide film, and removing said film.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein said solution comprises from 15 to 35% by volume amino-trimethylene-phosphonic acid.
Claim 4
Dependent Claim
25 words
The method of claim 1 wherein said anodizing is conducted at a current density in the range of from 0.5 to 1.5 amperes/in 2 .
Claim 5
Dependent Claim
71 words
A pre-treatment for a surface which is to be provided with a metallic plating deposited from solution, said surface being a material selected from the group consisting of molybdenum and molybdenum-rich alloys, comprising: electro-etching said surface in chromic acid-nitric acid solution to provide the same with a film-free matte finish, anodizing the electro-etched surface in an acidic medium to form thereon a continuous gray molybdenum oxide film, and removing said film.
Claim 6
Dependent Claim
71 words
A pre-treatment for a surface which is to be provided with a metallic plating deposited from solution, said surface being a material selected from the group consisting of molybdenum and molybdenum-rich alloys, comprising: electro-etching said surface in chromic acid-nitric acid solution to provide the same with a film-free matte finish, anodizing the electro-etched surface in an acidic medium to form thereon a continuous gray molybdenum oxide film, and removing said film.
Claim 7
Independent Claim
79 words
A method for etching a metallic material to be provided with a metallic plating, said material being selected from the group consisting of molybdenum and molybdenum-rich alloys, said method comprising: electro-etching said material in chromic acid--nitric acid solution at a current density in the range of from about 0.5 to 1.5 amperes/in 2 to provide the surface thereof with a matte finish, anodizing the resulting material to form a continuous gray molybdenum oxide film thereon, and removing said film.
Claim 8
Independent Claim
79 words
A method for etching a metallic material to be provided with a metallic plating, said material being selected from the group consisting of molybdenum and molybdenum-rich alloys, said method comprising: electro-etching said material in chromic acid--nitric acid solution at a current density in the range of from about 0.5 to 1.5 amperes/in 2 to provide the surface thereof with a matte finish, anodizing the resulting material to form a continuous gray molybdenum oxide film thereon, and removing said film.
Claim 9
Independent Claim
64 words
A method for etching a metallic material to be provided with a metallic plating, said material being selected from the group consisting of molybdenum and molybdenum-rich alloys, said method comprising: electro-etching said material to provide the surface thereof with a matte finish, anodizing the resulting material in aqueous amino-trimethylene-phosphonic acid solution to form a continous gray molybdenum oxide film thereon, and removing said film.
Claim 10
Independent Claim
64 words
A method for etching a metallic material to be provided with a metallic plating, said material being selected from the group consisting of molybdenum and molybdenum-rich alloys, said method comprising: electro-etching said material to provide the surface thereof with a matte finish, anodizing the resulting material in aqueous amino-trimethylene-phosphonic acid solution to form a continous gray molybdenum oxide film thereon, and removing said film.
Claim 11
Dependent Claim
26 words
The method of claim 6 wherein said anodizing is conducted at a current density in the range of from about 0.5 to 1.5 amperes/in 2 .
Claim 12
Dependent Claim
130 words
In the method of electrolessly nickel plating a surface of a metallic material selected from the group consisting of molybdenum and molybdenum-rich alloys, said method including the steps of rendering said surface catalytic for the aqueous-bath reduction of nickel cations to metallic nickel and the corresponding oxidation of hypophosphite anions to phosphite anions and then electrolessly plating the resulting catalytic surface with nickel from an aqueous nickel cation--hypophosphite anion bath, the improvement comprising preceding said rendering step with the following sequence of operations: electro-etching said surface in chromic acid--nitric acid solution at a current density in the range of from about 0.5 to 1.5 amperes/in 2 to provide it with a film-free matte finish, anodizing the electro-etched surface to form thereon a continuous gray oxide film, and removing said film.
Claim 13
Dependent Claim
130 words
In the method of electrolessly nickel plating a surface of a metallic material selected from the group consisting of molybdenum and molybdenum-rich alloys, said method including the steps of rendering said surface catalytic for the aqueous-bath reduction of nickel cations to metallic nickel and the corresponding oxidation of hypophosphite anions to phosphite anions and then electrolessly plating the resulting catalytic surface with nickel from an aqueous nickel cation--hypophosphite anion bath, the improvement comprising preceding said rendering step with the following sequence of operations: electro-etching said surface in chromic acid--nitric acid solution at a current density in the range of from about 0.5 to 1.5 amperes/in 2 to provide it with a film-free matte finish, anodizing the electro-etched surface to form thereon a continuous gray oxide film, and removing said film.
References Cited (Backward Citations)
US2313756A
Cited
US3290174A
Cited
US3446715A
Cited
US4101386A
Cited
US3935345A
Cited
US4069110A
Cited
US4055472A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-15 | 1984-01-14 | 1984-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-15 | 1988-01-14 | 1988-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-15 | 1992-01-14 | 1992-07-15 | $7700.00 | Window Closed / Lapsed |