PALLADIUM LAYERS DEPOSITION PROCESS

摘要

Palladium layers are often used as protective layers on the surface of substrates made of copper, nickel and cobalt, as well as their alloys with each other and/or with phosphorous or boron. The known processes, however, allow no adhesive, permanently glossy, bright palladium layers with few pores to be deposited. Such palladium layers may however be deposited from a formaldehyde-free chemical bath which contains a palladium salt, one or several nitrogenated complexing agents and formic acid or formic acid derivatives at a pH value higher than 4. Pretreating in a cementation palladium bath is also possible.