Hi,
May I know what is the industrial process to coat copper wire with palladium in the production of PdCu wire? What is the process and what instruments are used? Please kindly advise. Thanks.
Palladium coatings are deposited galvanically. To obtain electrolytic deposits of palladium, many electrolytes have been proposed in which the deposited metal is in the form of complex compounds. Even when ordinary salts are used as the starting product, they still form a complex by reacting in solution with other components. So, for example, PdCl2, dissolving in HCl, gives a compound whose anion has the form [PdCl4]2-. Electrocrystallization of palladium can occur both in acidic and in neutral and alkaline environments. Acidic electrolytes are not very common because they form dark porous deposits with high internal stress. Neutral electrolytes operate at a temperature of 25-35°C, pH=7.0-9.0, current density of 0.5-1.0 A/dm2 and make it possible to obtain matte and semi-shiny hard coatings. To obtain shiny and semi-shiny deposits of palladium, alkaline solutions are most often used. The most common palladium electrolytes are sulfamate, phosphate, and amino chloride.
One more method is described at
https://www.heraeus.com/media/media/het/doc_het/products_and_solutions_het_documents/bonding_wires_documents/fact_sheets/Factsheet_PdPRo.pdf
Dear Qun Ye many thanks for sharing this very interesting technical question with the RG community. The use of palladium-coated copper wire seems to be a hot topic in current semiconductor insdustry. As in many other cases, I strongly suggest that you directly use RG as a valuable source of information. The "Publications" section of RG holds a vast body of potentially useful literature references which have been posted by RG members, many of them even as public full texts. For example, please have a look at the following very interesting and freely available review article:
A REVIEW OF PALLADIUM COATED COPPER WIRE BONDING FOR AUTOMOTIVE DEVICE
Article A REVIEW OF PALLADIUM COATED COPPER WIRE BONDING FOR AUTOMOTIVE DEVICE
I hope this will be helpful. Good luck with your work and best wishes, Frank Edelmann
Dear Qun Ye P.S. In addition to the article which I already suggested in my first answer, you can also search the "Publications" section of RG for the term "palladium-coated copper wire". This will provide you with a long list of potentially helpful literature references:
https://www.researchgate.net/search.Search.html?type=researcher&query=palladium-coated%20copper%20wire
Hi. Greetings!
You can coat any metal surface with palladium by using Palladium Tetraamine Sulfate salt in water with Ammonia in it. This is the best and easy process of coating palladium.
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