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US 4,869,971 AGranted
Multilayer pulsed-current electrodeposition process
OwnerChin-Cheng Nee, Rolf Weilinventors
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OwnerChin-Cheng Nee, Rolf Weilinventors
Estimating the term…
A process for electrodepositing a multilayer deposit on an electrically-conductive substrate from a single electrodeposition bath yields a deposit which includes a sequence of essentially repeating groups of layers. Each group of layers comprises a layer of a first electrodeposited material and a layer of a second electrodeposited layer. The process includes the steps of immersing the substrate in an electrodeposition bath and repeatedly passing a charge burst of a first electric current and a second electric current through the electrodeposition bath to the substrate. The first electric current is a pulsed current with a first pulsed-on/off waveform and a first peak current density which is effective to electrodeposit the first electrodeposited material. The second electric current has a second waveform and a second current density which is effective to electrodeposit the second electrodeposited material. The duration of the charge bursts of the first and second electric currents is effective to cause layers of the first and second electrodeposited material of desired thicknesses to be deposited. Electrodeposits produced by preferred process of the invention can have outstanding mechanical and other properties.
A process for electrodeposition a multilayer deposit on an electrically conductive substrate from a single electrodeposition bath containing copper ions and zinc ions for electrodepositing brass-alloy material, the deposit comprising a sequence of essentially repeating groups of layers each group of layers comprising a layer of first electrodeposited brass-alloy material and a layer of a second electrodeposited brass-alloy material, the first electrodeposited brass-alloy material being a distinct material from the second electrodeposited brass-alloy material, the process comprising the steps of:
A multilayer material comprising a sequence of essentially repeating groups of layers, each group of layers including a layer of an alpha brass and a layer of a beta brass.
A multilayer material comprising a sequence of essentially repeating groups of layers, each group of layers including a layer of a beta brass in an ordered crystal configuration and a layer of a beta brass in a disordered crystal configuration.
A process for electrodepositing a multilayer deposit on an electrically conductive substrate from a single electrodeposition bath containing nickel ions and molybdenum ions for plating nickel-molybdenum-alloy material, the deposit comprising a sequence of essentially repeating groups of layers, each group of layers comprising a layer of a first electrodeposited nickel-molybdenum-alloy material and a layer of a second electrodeposited nickel-molybdenum-alloy material, the first electrodeposited nickel-molybdenum-alloy material being a distinct material from the second electrodeposited nickel-molybdenum-alloy material, the process comprising the steps of:
A multilayer material comprising a sequence of essentially repeating groups of layers, each group of layers including a layer of a nickel-molybdenum alloy having crystal grains of first average size and a layer of a nickel-molybdenum alloy having crystal grains of a second average size different from the first average size.
Dependencies are inferred from the claim text.