Claims
- 1. A method of electrodepositing on an electrically conductive substrate an electrodeposited substantially homogeneous admixture of nickel and iron, said homogeneous admixture containing substantially no iron oxide, said mixture having a temperature expansion coefficient of less than about 5.times.10.sup.-6, said method comprising forming an electrolytic aqueous solution having a pH of less than about 3 and consisting essentially of nickel chloride ions and ferrous sulfate ions containing substantially no iron oxide, the amount of ferrous ions present in said aqueous electrolyte solution being between about 60 weight percent and 80 weight % based on the total weight of ferrous ions and nickel ions present in said aqueous electrolyte solution and the amount of nickel ions present in said aqueous electrolyte solution being between about 40 weight percent and 20 weight percent based on the total weight of ferrous ions and nickel ions present in said aqueous electrolyte solution, said electrolytic solution being in contact with an anode, said anode consisting essentially of iron and nickel, the amount of iron and nickel in said anode being substantially the same weight percent as the amount of nickel and iron in the electrodeposited homogeneous admixture of nickel and iron, said anode being electrically connected to a source of electric potential; contacting said electrically conductive substrate with said electrolytic solution, said substrate functioning as a cathode when electric current is passed through said anode, said aqueous electrolytic solution and said substrate; conducting an electric current through said anode, electrolytic solution and substrate; excluding free oxygen from said electrolytic solution while said current is being conducted therethrough; discontinuing the conduction of said electric current through said anode, electrolytic solution and substrate when a predetermined amount of said nickel ions and ferrous ions are electrodeposited on said substrate; and removing said substrate from contact with said electrolytic solution.
- 2. A method according to claim 1 wherein the temperature of said electrolytic solution, while said current is passed through, is between about 175.degree. F. and the boiling point of said aqueous electrolyte solution.
- 3. A method according to claim 1 wherein the concentration of ferrous ions in said electrolytic solution is between about 0.5 molar and 1.5 molar.
- 4. A method according to claim 3 wherein the concentration of nickel ions in said electrolytic solution is between about 0.1 molar and 1 molar.
- 5. A method according to claim 1 wherein the current conducted through said anode, said aqueous electrolytic solution and substrate is between about 20 amps per square foot and 50 amps per square foot.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part application of pending U.S. patent application Ser. No. 775,310, filed Mar. 7, 1977 now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3317410 |
Croll et al. |
May 1967 |
|
3506547 |
Ambrosia et al. |
Apr 1970 |
|
Foreign Referenced Citations (2)
Number |
Date |
Country |
50234 |
Jun 1974 |
AUX |
2132664 |
Jan 1973 |
DEX |
Non-Patent Literature Citations (1)
Entry |
Modern Electroplating, Edited by F. Lowenheim, 2nd Edition, 1963, pp. 462-472. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
775310 |
Mar 1977 |
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