Analysis Of The Advantages And Disadvantages Of The Replacement Reaction Process And The Preparation Of Silver Coated Copper Powder

Analysis of the advantages and disadvantages of the replacement reaction process and the preparation of silver coated copper powder

December 29,2021.

The displacement reaction method is a common process for processing silver-coated copper powder. Because the surface activity of copper powder is very large, it is easy to oxidize, so it must be pretreated before coating the copper powder.
1. Put the required amount of copper powder into the pretreatment tank, and then wash with 15% 30% dilute sulfuric acid to keep the pH of the solution at 3

2. Wash the pickled copper powder with distilled water until no Cur is detected by potassium hexacyanoferrate, and then repeatedly wash and dehydrate, test with pH test paper to ensure that the copper powder is washed to neutrality, and then centrifuged and dried for later use . For the copper powder after surface modification with organic solvent, it is necessary to add the copper powder to the acetone solution to completely wet the copper powder, and then add a certain amount of water to dilute the acetone, and place it in a ventilated place for a period of time. Silver-plated doors can be carried out after volatilization.

3. When a metal with a relatively negative potential is immersed in a solution of a metal ion with a relatively positive potential, a microbattery is formed due to the presence of a certain electromotive force. On the surface of the metal with a relatively negative potential, the precipitation of the metal with a positive potential and a relatively high potential will occur. Corresponding dissolution of negative metals. Under these conditions, the process of metal precipitation and plating formation is called displacement plating.

The silver coated copper powder prepared by the displacement plating process has the advantages of simple process and low cost, but the plating layer is relatively loose, and the bonding strength of the thick plating layer and the substrate is low. These shortcomings can be improved by changing the composition of the bath, such as adding additives or complexing agents.

SAT NANO specializes in the production of silver clad copper powder, using different processes according to customer needs, and has achieved a better coating effect. If you have any question, please feel free to contact us at admin@satnano.com

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