Kinetics of charge transfer at mechanically strained copper electrodes—I. Anodic dissolution

✍ Scribed by M.A.V. Devanathan; M.J. Fernando

• Publisher: Elsevier Science
• Year: 1970
• Tongue: English
• Weight: 1022 KB
• Volume: 15
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(70)80084-6

✦ Synopsis

A technique is described which permits a recording of mechano-electrochemical dissolution current at constant pre-determined strain rates for the Culaq. CuSO, system under potentiostatic control. Studies have been carried out in the range 2-5-l 5 mV with strain rate ranging from 0447 to O-9105 strain/nun. The increase in current is proportional to the square root of the corrected strain e at constant overpotential 7, the gradient being dependent on 7. At high strains, a slight departure from linearity has been observed: this deviation is greater, the lower the strain rate.

The results are interpreted on the slow surface diffusion model. The variation of dislocation density consequent on straining shortens the surface diffusion path, thereby enhancing the dissolution current. An equation is derived which connects the dissolution current with .slt4, q, a factor G