Chemistry: electrical and wave energy – Processes and products
Patent
1978-06-21
1980-11-04
Tufariello, T. M.
Chemistry: electrical and wave energy
Processes and products
204 9, 204 43T, C25D 102, C25D 106, C25D 356
Patent
active
042318475
ABSTRACT:
There is disclosed a method of electrodepositing, on a substrate, a substantially homogeneous admixture (alloy) of nickel and iron containing substantially no iron oxides and having a low temperature expansion coefficient. The method includes the steps of forming an aqueous electrolyte solution of nickel chloride and ferrous sulfate containing ferrous ions and nickel ions present in predetermined concentrations which will yield a nickel iron alloy with predetermined proportions of nickel and iron and having a low temperature expansion coefficient, and electrodepositing the nickel and iron from the solution onto a substrate using a nickel iron anode whose proportions of nickel and iron equal or substantially equal those of the alloy to be deposited, whereby the anode is electrochemically corroded by the solution at substantially 100% efficiency to continuously and uniformly maintain the proper nickel and iron proportions in the solution during the entire electrodeposition process. When electrodepositing the iron and nickel on the substrate it is important that free oxygen be excluded from the electrolyte solution. In addition, there is disclosed an optical mirror consisting essentially of an electrodeposited nickel-iron face sheet having a relatively low temperature coefficient of expansion on a lightweight graphite backup substrate having approximately the same temperature coefficient of expansion as the electrodeposited nickel-iron face sheet.
REFERENCES:
patent: 3317410 (1967-05-01), Croll et al.
patent: 3506547 (1970-04-01), Ambrosia et al.
Modern Electroplating, Edited by F. Lowenheim, 2nd Edition, 1963, pp. 462-472.
Connors John J.
Nyhagen Donald R.
TRW Inc.
Tufariello T. M.
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