Electroplating bath for nickel-iron alloys and method

Details Electroplating bath for nickel-iron alloys and method Electroplating bath for nickel-iron alloys and method

1997-08-25

1999-08-03

Mayekar, Kishor

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Depositing predominantly alloy coating

205119, 106 127, C25D 312

Patent

active

059320826

ABSTRACT:
An improved electroplating bath, complexing agent, product and method for producing nickel-rich nickel-iron alloys, such as Permalloy, having about 22% iron and 78% nickel. The improved electroplating bath contains a small amount of an organic amine complexing agent such as ethylenediamine or diethylenetriamine which increases the nickel/iron mass ratio of the deposit, causes nickel to be deposited in favor of iron, reduces the sensitivity of the deposit composition to the iron content of the bath and the applied current density. Further, the pH of the bath is adjusted to about 5.0 to stabilize the complexes and tartaric acid is added to complex ferric ion and thus prevent its precipitation. The organic amine complexing agents useful in accordance with the present invention are agents which complex with nickel and include ethylenediamine and diethylenetriamine each having at least two amine groups with each of the amine groups separated by two carbons.

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