Summary for silver plating process Discussion
Silver plating process questions centered on whether a non-cyanide bath can be made brighter and more economical for engineering use. S.H. Hashemi described a bath using silver iodide, potassium iodide, calcium salt, and sodium salt with a silver anode and copper cathode, producing a semi-bright deposit about 15–18 micrometers thick after 15 minutes at 0.65 AFS and 20 °C. He noted the coating had good adhesion but was undesirable in appearance and asked whether a brighter finish or a lower-cost process would be better. Bill Markle replied that, if there is no reason to avoid cyanide, he would try a cyanide-based silver bath instead, since commercially available cyanide silver baths from major manufacturers are designed to produce bright finishes. The thread therefore points to cyanide silver plating as the practical route for brightness, while acknowledging the non-cyanide process may already offer good adhesion.
I request you to send me technical and necessary information about Silver plating for engineering purposes. I used non cyanide silver plating bath that consist of Silver Iodide , Potassium Iodide , Calcium salt , Sodium salt ,with a Silver anode ,Copper cathode
,current density 0.65 AFS,Temp. 20 °C thickness of coating after 15 min is 15-18 micrometer .This process does not need under coating or striking. This coating is semi-bright ,this result is undesirable.
1) Would be better off to obtain very bright coating ? This procedure is expensive ,but properties of coating is good (such as adhesion).
2) Would I be better off at a economical process? My reference is U.S.Patent NO.4,003,806
Please send me your answer as soon as possible.
Yours faithfully
S.H.Hashemi
Saied Hamid_Hashemi
Malek-ashtar Univ.of Tech – Isfahan,Iran
A. If there is no reason you cannot use a cyanide based bath, I would try it. There are commercially available cyanide based silver baths available from the major manuifacturers that produce bright finishes.
Bill Markle
– Jacsonville, Florida, USA