Studies of Palladium Electrodeposition From Baths Based on Pd(NH sub 3 ) sub 2 X sub 2 . II. X = Bromine and X = NO sub 2

The chemistry and electrochemistry of electroplating baths based on Pd(NH sub 3 ) sub 2 Br sub 2 and Pd(NH sub 3 ) sub 2 (NO sub 2 ) sub 2 have been investigated and compared with that previously reported for Pd(NH sub 3 ) sub 2 Cl sub 2 . It is shown that electroactive species in all the baths is Pd(NH sub 3 ) exp 2+ sub 4 and, hence, the mechanisms and current efficiencies for the cathodic deposition of Pd metal are similar in all three media. On the other hand, only in bromide electrolytes is the Pd found to dissolve anodically.