Process of electroplating a platinum-rhodium alloy coating

摘要: The present invention provides a process of electroplating platinum-rhodium alloy coating predetermined composition and thickness on metal substrate. is substantially uniform throughout the electrodeposited coating. includes steps electrolytically dissolving an anode made platinum or rhodium into molten cyanide bath to prepare separately bath, forming mixed having ratio from separate baths, onto substrate, using electrical charge alternating with anode, while monitoring controlling deposition potential This corresponds in bath. carried out dry, inert gas environment. moisture-free, there immersed this selective ion transport membrane, such as Pyrex, that maintains cathode moisture-free which immersed. Also provided wherein step followed by electrodissolution step.