Amorphous transition metal alloy, gold-coated electrical contact

摘要

Electrical contact having a resistance of below 4 ohm. comprises an amorphous transition metal alloy deposited on a substrate; and an uncovered Au layer of thickness 1-30 pref. 5-15 micro-in. Transition metal alloy is pref. Ni-P contg. 15-25 wt.% P and 5-15 wt.% Co. - Layers are deposited by electro-plating. The Ni(-Co)-P layer is plated from a bath at 70-85 deg.C at current density 100-900 A/sq. ft. to produce a plated thickness of 25-1000 micro-ins. The plating bath also contains 0.1M to solubility limit of TiF6(2-), SiF6(2-) or ZrF6(2-) ions.