Electrochemical impedance spectroscopy study of silver cementation on copper

✍ Scribed by C. Alemany; J.-P. Diard; B. le Gorrec; C. Montella

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 761 KB
• Volume: 41
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(96)85984-6

✦ Synopsis

The cementation of Ag+ ion onto a copper disk electrode has been studied. A new method was used to monitor the concentration of the Ag+ ion during the reaction. After a certain time, the cementation reaction, initiated in a dilute Ag+ solution, follows a first order kinetic relationship for several hours.

The cathodic reduction of the Ag+ ion on a silver electrode and the anodic oxidation of a copper electrode under potentiodynamic conditions and the cementation reaction under intensiodynamic conditions were studied by impedance spectroscol y. Copper oxidation and Ag+ ion reduction reactions do not behave as simple redox reactions. Furthermute, a mechanism based on diffusion-convection towards a uniformly accessible electrode cannot be used to interpret the results obtained. The impedance measurements suggest that during cementation the electrode behaves like a partially blocked electrode with an evolving structure.