Thermal annealing of palladium alloys

Details Thermal annealing of palladium alloys Thermal annealing of palladium alloys

C - Chemistry, Metallurgy

22

F

C22F 1/14 (2006.01) C21D 1/06 (2006.01) C25D 3/56 (2006.01) C25D 5/50 (2006.01) C25D 7/00 (2006.01)

Patent

CA 2069363

This invention is concerned with production of electrical devices comprising an electrodeposited conductive region free from cracking defects. In the production of a contact portion of the device from a metal strip electroplated with a conductive stripe of an alloy, the stripe exhibited, upon stamping and forrning operation, cracked areas. Typically, the stripe coating on the metal strip, such as a copper bronze material, includes a layer of nickel, a layer of palladium alloyed with nickel, cobalt, arsenic or silver, and a flash coating of hard gold. The cracking defects were eliminated by subjecting the plated strip to an annealing treatment prior to the stamping and forming operation. After the heat-treatment, the stripe was free from cracks and separations between the successive layers.

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